REVIEW 4 major objections 6 minor 127 references
Steady base states in a two-dimensional chiral fluid. The chiral Stokes cavity
T0 review · 4 major / 6 minor · reviewed 2026-07-31 · grok-4.5
Pith's one-line read The entire linear chiral response of a two-dimensional fluid is the Newtonian stress rotated by 90 degrees, one coefficient and one mechanical action per channel.
desk verdict Solid first-principles 2D chiral hydrodynamics with a usable base-state library; the cavity math is clean, but the single-group claim rests on an unmeasured microscopic spin-screening length. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The translation–rotation correspondence: the Levi-Civita tensor maps each irreducible Newtonian channel (isotropic pressure, bulk viscosity, deviatoric strain rate, spin-flux gradient) onto a unique parity-odd partner. That map produces the complete odd stress and spin flux, reduces incompressible steady spin to an algebraic slave of vorticity, and yields the modified Helmholtz equation ∇²ω = α²ω that governs the chiral Stokes cavity.
What would settle it
In a confined suspension of air-fluidised chiral disks, measure whether the steady vorticity field crosses from a single screened vortex to interior sign reversal when the dimensionless group |α|L passes the first Dirichlet eigenvalue of the container (j₀,₁ for a disk, π√2 for a square), at fixed material parameters.
Extended reading notes
Core claim
Enforcing angular-momentum conservation without assuming stress symmetry, the full linear chiral response of a two-dimensional fluid is generated from the Newtonian stress by one physically natural operation—the 90° rotation through which chirality acts. Applied channel by channel in the irreducible decomposition, the rotation assigns each classical coefficient a unique chiral partner and a unique mechanical action. Steady confined flow then obeys a modified Helmholtz–Poisson system whose single control parameter αL organises both circular and square cavities and drives the transition from screened single-vortex flow to interior sign reversal at the first Dirichlet eigenvalue of the domain.
Load-bearing premise
The spin diffusion length is assumed microscopic, of order the particle radius, so that spin flux can be dropped in the bulk and the steady spin field is locked algebraically to the local vorticity.
Editorial extensions
If this is right
- Quiescent chiral states exist only when the applied torque density is harmonic; non-harmonic activity forces flow.
- A single mesoscopic length α⁻¹ controls both forced azimuthal edge currents and boundary-driven cavity flow.
- Odd viscosity is silent in the bulk vorticity of incompressible flow and appears only as a pressure shift and wall traction.
- Earlier phenomenological chiral-fluid models are recovered as the infinite-rotational-drag limit in which spin is prescribed rather than solved.
- Wall torque on a resting chiral suspension measures the entrainment coefficient β without requiring flow.
Reading between the lines
- If couple-stress diffusion is not microscopic, the algebraic spin closure fails and the cavity should show an extra boundary layer of thickness ℓ_s that the present single-group phenomenology cannot capture.
- The holomorphic chiral complex potential suggests that multiply connected domains will force azimuthal currents purely from topology, analogous to circulation periods in ideal flow.
- The same αL organisation should appear in any confined chiral suspension whose substrate drag sets a finite screening length, independent of the microscopic origin of the active torque.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript formulates the two-dimensional hydrodynamics of a fluid carrying a particle-spin field, retaining angular-momentum conservation and an antisymmetric stress. It classifies fluids according to the body couple, writes the Newtonian and odd stress sectors through a channel-by-channel Levi-Civita rotation, and derives a chiral pressure proportional to the spin–vorticity mismatch together with a two-term spin flux. For incompressible flow with negligible bulk spin diffusion, the author obtains algebraic spin closure, holomorphic quiescent states, forced axisymmetric states, and a boundary-driven “chiral Stokes cavity” governed by ∇²ψ=−ω and ∇²ω=α²ω. The disk problem is solved analytically and the square problem numerically, with screened and oscillatory regimes separated by the relevant Dirichlet eigenvalue.
Significance. If the stated closure and boundary model apply, this is a useful and elegantly organized base-state theory for confined chiral fluids. Particular strengths are the deviatoric stress decomposition, the exact hydrostatic family (including its freedom from the spin-diffusion approximation), the closed-form disk solution, the spectral interpretation of the disk and square crossovers, and the publicly available Python code. The wall-torque relation, pressure–vorticity shift, and |α|L thresholds are falsifiable predictions. The quantitative cavity claims are nevertheless conditional on a microscopic spin-screening length and on the prescribed wall-vorticity condition; those limits need sharper treatment before the results can be read as experimentally quantitative.
major comments (4)
- [§5.4, Eqs. (6.2)–(6.3); §8, Eqs. (8.3), (8.13)–(8.16)] The bulk spin-flux neglect is load-bearing for the cavity reduction but is supported only by the dimensional estimate κ∼μ_R a². Retaining κ in Eq. (6.2) gives, for a Fourier mode, q²[μ+μ_R/2−μ_R²/(2μ_R+Γ_Ω+κq²)]=−Γ: α² becomes q-dependent, a second radial scale appears, and the sign-reversal threshold is shifted. Please add the finite-κ linear correction or a quantitative smallness criterion, including its effect on the first critical value, and present Eqs. (8.13)–(8.16) explicitly as the ℓ_s/L→0 limit.
- [§5.4, Eq. (6.3); §8.1] For the kind-II-a balance, the relaxation coefficient multiplying Ω is 2μ_R+Γ_Ω, whereas Eq. (6.3) defines ℓ_s=√(κ/2μ_R). This is especially problematic in the active branch, where μ_R<0 is contemplated and positivity must come from Γ_Ω. The screening estimate should therefore be stated in terms of the actual coefficient in Eq. (8.3), and the relation κ∼|μ_R|a² justified as a magnitude estimate rather than used to say that the couple-stress issue is “settled.”
- [§8.2, Eq. (8.17); Appendix A.1] The prescribed constant wall vorticity is introduced as a working convention and then determines the Dirichlet thresholds j_{0,1} and π√2. Appendix A gives a plausible wall-layer interpretation, but no wall constitutive law or matching calculation shows that a single α-independent Dirichlet value is appropriate; with finite κ, Ω or C·n data also enter. Since the crossover and proposed experimental tests are boundary-spectrum statements, please either derive/justify the condition from a wall-layer model or quantify its robustness under a Robin or prescribed-slip alternative, and otherwise frame the results as conditional.
- [§5.1, Eq. (5.2); §5.2, Eq. (5.10)] Angular-momentum conservation leads to Eq. (3.18), but it does not by itself imply that the odd stress is the rotated Newtonian stress in Eq. (5.2), nor that p_R must vanish at rigid co-rotation. Those are constitutive inputs requiring explicit assumptions—linearity, locality, isotropy, broken parity, and the chosen reference state. Because “one coefficient per channel” and “derived from first principles” are central claims, please supply the symmetry classification or qualify these statements as a constitutive model.
minor comments (6)
- [§1.1; §1.3; §9.2; Acknowledgments] The last paragraph says the paper will “compare its predictions quantitatively with experimental data,” but §1.3 and §9 state that this comparison is in preparation, and no data comparison appears. The acknowledgments also say experimental data “used in this work” were taken by collaborators. These statements should be made consistent.
- [§8, after Eq. (8.16)] The generic discussion following Eq. (8.15) first invokes boundary conditions derived from no-slip, then says no-slip is not imposed. This would be clearer if the prescribed-vorticity/slip boundary problem were introduced before the numerical-method discussion.
- [§8.2] The symbol τ(A) appears in the circular-cavity paragraph and solution, while τ_a is used elsewhere. Please make the activity notation consistent.
- [Figures 4 and 6] The separate color scales in Figs. 4 and 6 make the claimed amplification and relative strength of the reversed cells difficult to assess. A common scale for selected panels, or an additional quantitative profile/colorbar annotation, would help.
- [§8.3; Appendix A.2] Please report the grid size and convergence level used for the plotted square-cavity solutions in the main text or figure caption, rather than only referring generally to Appendix A and the repository.
- [Abstract; §8.3] The phrase “a single dimensionless group controls both geometries” should be qualified: |α| times a domain size organizes each geometry, but the critical value and eigenfunctions remain shape-dependent.
Circularity Check
No load-bearing circularity: cavity solutions and channel structure follow forward from balance laws plus a stated constitutive ansatz; experimental comparison is deferred, not fitted.
-
self definitional
[§5.1, Eqs. (5.1)–(5.2); abstract claim on rotation generating entire chiral response]
"the stress tensor of the kind-II fluid is the sum of σ_I and a new contribution, coined the odd stress, which we write as the rotated version of σ_I: σ_II = σ_I + σ_odd, where σ_odd_ij = ε_ik[−σ* δ_kj + 2μ_odd d_kj] = p_R ε_ij + ζ_odd(∇·u)ε_ij + 2μ_odd ε_ik d_kj"
The abstract and §5 claim to show that the entire chiral response is generated from the Newtonian stress by a single 90° rotation with one coefficient per channel. In §5.1 that odd stress is introduced by writing it as the rotated copy of σ_I. Once that constitutive form is adopted, the partner-channel map (Table 1) is true by construction of the ansatz plus 2D tensor algebra, not an independent derivation. Mild only: consequences (silence of μ_odd/κ_odd, cavity PDE, holomorphic hydrostatics) are still non-trivial deductions from the choice, and no data are fitted.
full rationale
The derivation chain is self-contained and mostly non-circular. Conservative/convective balances (2.1–3.3), the implication that a body couple forces a non-symmetric stress (3.15–3.18), the kinematic selection p_R = μ_R(Ω − ω/2) (5.10), the incompressible reduction, and the modified Helmholtz–Poisson cavity system (8.14–8.16) with closed-form disk and numerical square solutions are obtained forward from the stated equations. Recovery of Han et al. and Marini Bettolo Marconi et al. as Γ_Ω → ∞ / prescribed-spin limits is presented as a consistency check, not an input. López-Castaño et al. (2022) and the code repo are cited for deferred comparison and reproducibility; they do not force the analytic claims. The only mild self-definitional note is that the odd stress is introduced by writing it as the rotated Newtonian stress (§5.1), after which the one-coefficient-per-channel map is immediate; that is a constitutive modelling choice framed as a first-principles show, not a fitted prediction or a self-citation uniqueness theorem. The skeptic’s concern about the dimensional neglect of κ∇²Ω is a correctness/assumption risk, not circularity. Score 1.
Assumptions & free parameters
free parameters (6)
- rotational viscosity μ_R (and sign)
- shear viscosity μ and odd viscosity μ_odd
- substrate drags Γ and Γ_Ω
- spin viscosity κ (and odd spin viscosity κ_odd)
- wall vorticity Dirichlet value ω_w
- active torque density τ_a
assumptions (8)
- domain assumption Angular-momentum balance is enforced with a dynamical spin field; stress need not be symmetric when body couple τ_0 ≠ 0.
- domain assumption Constitutive response is linear in first gradients (Navier–Stokes order); Burnett-order vorticity gradients are excluded from spin flux.
- ad hoc to paper Odd stress equals the Levi-Civita rotation of the Newtonian stress (channel-by-channel), not a more general parity-odd tensor.
- domain assumption Chiral pressure is p_R = μ_R(Ω − ω/2), the unique linear pseudoscalar that vanishes in rigid co-rotation.
- ad hoc to paper Spin screening length is microscopic (ℓ_s ≲ a), so bulk spin flux divergence is negligible and steady Ω is algebraically slaved to ω.
- domain assumption Incompressible flow, constant transport coefficients, steady Stokes (negligible advection) for base states and cavity.
- domain assumption Kind II-a: body couple is intrinsic active torque plus substrate rotational drag; no external axial field feedback.
- ad hoc to paper Cavity boundary data: impermeability ψ=0 and prescribed wall vorticity ω=ω_w; no-slip not imposed.
invented entities (3)
-
chiral complex potential χ = p + i p_R
independent evidence
-
chiral Stokes cavity (modified Helmholtz–Poisson confined flow)
independent evidence
-
entrainment coefficient β and modified rotational viscosity μ'_R
independent evidence
Cite this review
Pith. "Pith review of Steady base states in a two-dimensional chiral fluid. The chiral Stokes cavity." pith.science (2026). https://pith.science/paper/G2ZXYTXI
@misc{pith2026260724279,
author = {Pith},
title = {Pith review of: Steady base states in a two-dimensional chiral fluid. The chiral Stokes cavity},
year = {2026},
howpublished = {\url{https://pith.science/paper/G2ZXYTXI}},
note = {Machine review of arXiv:2607.24279}
}
abstract
We develop from first principles the hydrodynamics of a two-dimensional chiral fluid, i.e. one carrying a net microscopic angular-momentum (spin) field. Enforcing angular-momentum conservation without imposing stress-tensor symmetry, we derive the full form of the stress tensor and of the spin flux, and we show that the entire chiral response is generated from the classical Newtonian one by a single operation of direct physical origin --- the $90^{\circ}$ rotation through which chirality acts, mirrored at the particle level by transverse forces (Caprini & Marini Bettolo Marconi 2025). Applied to the irreducible (deviatoric) decomposition, the rotation assigns to each classical channel a chiral partner --- pressure to chiral pressure, bulk and shear viscosities to their odd counterparts, the spin-flux gradient to its rotated image --- one coefficient and one mechanical action per channel, with no further cross-couplings. In this representation the steady base states become elementary. Quiescent states are organised by a holomorphic chiral complex potential, the mechanical and chiral pressures forming a conjugate harmonic pair subject to a topological existence condition; inhomogeneous activity forces azimuthal flows; and a boundary-driven confined flow, the chiral Stokes cavity, obeys a modified Helmholtz--Poisson system, solved in closed form in a circular domain and numerically in a square one. A single dimensionless group controls both geometries and sets the crossover from a screened, single-vortex regime to a sequence of sign-reversing vortical structures. The theory yields quantitative predictions, amenable to direct comparison with experiments on air-fluidised chiral disks (L\'opez-Casta\~no et al. 2022), and recovers the phenomenological frameworks of the chiral-fluid literature as particular cases.
Figures
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Reference graph
Works this paper leans on
-
[1]
Aranson, Igor S. and Tsimring, Lev S. , title =. Reviews of Modern Physics , year = 2006, volume = 78, number = 2, month = jun, pages =. doi:10.1103/revmodphys.78.641 , url =
-
[2]
Avron, J. E. , title =. Journal of Statistical Physics , year = 1998, volume = 92, number =. doi:10.1023/a:1023084404080 , url =
-
[3]
and Souslov, A
Banerjee, D. and Souslov, A. and Abanov, A. G. and Vitelli, V. , journal =. Odd viscosity in chiral active fluids , doi =. 2017 , volume =
2017
-
[4]
Batchelor, G. K. , title =. doi:10.1017/cbo9780511800955 , url =
-
[5]
and Izri, Z
Beppu, K. and Izri, Z. and Sato, T. and Yamanishi, Y. and Sumino, Y. and Maeda, Y. T. , journal =. Edge current and pairing order transition in chiral bacterial vortices , doi =. 2021 , volume =
2021
-
[6]
and Fakhri, Nikta and Marchetti, M
Bowick, Mark J. and Fakhri, Nikta and Marchetti, M. Cristina and Ramaswamy, Sriram , title =. Physical Review X , year = 2022, volume = 12, number = 1, month = feb, issn =. doi:10.1103/physrevx.12.010501 , url =
-
[7]
Boyer, P. D. , journal =. The. 1997 , volume =
1997
-
[8]
Braginskii, S. I. , title =. Reviews of Plasma Physics , editor =. 1965 , note =
1965
Show all 127 references
-
[9]
1972 , author =
Kinetic theory , publisher =. 1972 , author =
1972
-
[10]
Analytical and numerical studies of the structure of steady separated flows , volume =. J. Fluid Mech. , author =. 1966 , pages =. doi:10.1017/S0022112066000545 , number =
1966 doi
-
[11]
Burnett , title =
D. Burnett , title =. Proc. London Math. Soc. , year =
-
[12]
and Marini Bettolo Marconi, U
Caprini, L. and Marini Bettolo Marconi, U. , title =. Journal of Chemical Physics , volume =
-
[13]
and Tailleur, Julien , title =
Cates, Michael E. and Tailleur, Julien , title =. Annual Review of Condensed Matter Physics , year = 2015, volume = 6, number = 1, month = mar, pages =. doi:10.1146/annurev-conmatphys-031214-014710 , url =
2015 doi
-
[14]
1981 , isbn =
Chandrasekhar, Subrahmanyan , title =. 1981 , isbn =
1981
-
[15]
Chapman and T
C. Chapman and T. G. Cowling , year =. The Mathematical Theory of Non-Uniform Gases , publisher =
-
[16]
and Rinaldi, C
Chaves, A. and Rinaldi, C. and Elborai, S. and He, X. and Zahn, M. , title =. Phys. Rev. Lett. , volume =
-
[17]
and Dahler, John S
Condiff, Duane W. and Dahler, John S. , title =. The Physics of Fluids , year = 1964, volume = 7, number = 6, month = June, pages =. doi:10.1063/1.1711295 , url =
1964 doi
-
[18]
Dahler, J. S. and Scriven, L. E. , title =. Nature , volume =
-
[19]
and Löwen, Hartmut and
Debets, Vincent E. and Löwen, Hartmut and. Glassy Dynamics in Chiral Fluids , journal =. doi:10.1103/physrevlett.130.058201 , url =
-
[20]
and Gonnella, Giuseppe and Pagonabarraga, Ignacio , title =
Digregorio, Pasquale and Levis, Demian and Suma, Antonio and Cugliandolo, Leticia F. and Gonnella, Giuseppe and Pagonabarraga, Ignacio , title =. Physical Review Letters , year = 2018, volume = 121, number = 9, month = aug, issn =. doi:10.1103/physrevlett.121.098003 , url =
2018 doi
-
[21]
and Pagonabarraga, I
Di Gregorio, P. and Pagonabarraga, I. and Vega Reyes, F. , title =. Phys. Rev. Lett. , volume =. 2026 , doi =
2026
-
[22]
and Heidenreich, S
Dunkel, J. and Heidenreich, S. and Drescher, K. and Wensink, H. H. and B. Fluid dynamics of bacterial turbulence , doi =. Physical Review Letters , year =
-
[23]
and Wang, H
Elston, T. and Wang, H. and Oster, G. , journal =. Energy transduction in. 1998 , volume =
1998
-
[24]
Eringen, A. C. , title =. J. Math. Mech. , volume =
-
[25]
Ferziger, J. H. and Peri\'c, M. , title =
-
[26]
2012 , doi =
Theodore Frankel , title =. 2012 , doi =
2012
-
[27]
and Fruchart, M
Han, M. and Fruchart, M. and Scheibner, C. and Vaikuntanathan, S. and de Pablo, J. J. and Vitelli, V. , title =. Nat. Phys. , volume =
-
[28]
Hancock, W. O. , journal =. Myosin regulatory mechanisms , doi =. 2018 , volume =
2018
-
[29]
Hilbert , title =
D. Hilbert , title =. Math. Ann. , year =
-
[30]
and Noda, Y
Hirokawa, N. and Noda, Y. and Tanaka, Y. and Niwa, S. , journal =. Kinesin superfamily motor proteins and intracellular transport , doi =. 2009 , volume =
2009
-
[31]
Javier and Dufty, James W
Brey, J. Javier and Dufty, James W. and Kim, Chang Sub and Santos, Andrés , title =. Physical Review E , year = 1998, volume = 58, number = 4, month = Oct, pages =. doi:10.1103/physreve.58.4638 , url =
1998 doi
-
[32]
, title =
Klymko, Katherine and Mandal, Dibyendu and Mandadapu, Kranthi K. , title =. The Journal of Chemical Physics , volume =. 2017 , doi =
2017
-
[33]
Kull, F. J. and Endow, S. A. and Pyle, A. M. and Block, S. M. , journal =. Force generation by kinesin and myosin cytoskeletal motor proteins , doi =. 2013 , volume =
2013
-
[34]
Physics Letters A , year = 2015, volume = 379, number =
Lingam, Manasvi , title =. Physics Letters A , year = 2015, volume = 379, number =. doi:10.1016/j.physleta.2015.03.014 , url =
2015 doi
-
[35]
and Márquez Seco, Alejandro and Márquez Seco, Alicia and Rodríguez-Rivas, Álvaro and Reyes, Francisco Vega , title =
López-Castaño, Miguel A. and Márquez Seco, Alejandro and Márquez Seco, Alicia and Rodríguez-Rivas, Álvaro and Reyes, Francisco Vega , title =. Physical Review Research , year = 2022, volume = 4, number = 3, month = sep, issn =. doi:10.1103/physrevresearch.4.033230 , url =
2022 doi
-
[36]
Proceedings of the National Academy of Sciences , year = 2022, volume = 119, number = 42, month = Oct, issn =
Lou, Xin and Yang, Qing and Ding, Yu and Liu, Peng and Chen, Ke and Zhou, Xin and Ye, Fangfu and Podgornik, Rudolf and Yang, Mingcheng , title =. Proceedings of the National Academy of Sciences , year = 2022, volume = 119, number = 42, month = Oct, issn =. doi:10.1073/pnas.220...
2022 doi
-
[37]
Marchetti, M. C. and Joanny, J. F. and Ramaswamy, S. and Liverpool, T. B. and Prost, J. and Rao, Madan and Simha, R. Aditi , title =. Reviews of Modern Physics , year = 2013, volume = 85, number = 3, month = jul, pages =. doi:10.1103/revmodphys.85.1143 , url =
2013 doi
-
[38]
New Journal of Physics , year = 2026, volume = 28, number = 6, month = May, pages = 064401, issn =
Marini Bettolo Marconi, Umberto and Petrini, Alessandro and Maire, Raphael and Caprini, Lorenzo , title =. New Journal of Physics , year = 2026, volume = 28, number = 6, month = May, pages = 064401, issn =. doi:10.1088/1367-2630/ae6c55 , url =
2026 doi
-
[39]
, title =
Markovich, Tomer and Lubensky, Tom C. , title =. Physical Review Letters , year = 2021, volume = 127, number = 4, month = jul, issn =. doi:10.1103/physrevlett.127.048001 , url =
2021 doi
-
[40]
New Journal of Physics , year = 2019, volume = 21, number = 11, month = Nov, pages = 112001, issn =
Markovich, Tomer and Tjhung, Elsen and Cates, Michael E , title =. New Journal of Physics , year = 2019, volume = 21, number = 11, month = Nov, pages = 112001, issn =. doi:10.1088/1367-2630/ab54af , url =
2019 doi
-
[41]
Melcher, J. R. and Taylor, G. I. , title =. Annu. Rev. Fluid Mech. , volume =
-
[42]
and Rosensweig, R
Moskowitz, R. and Rosensweig, R. E. , title =. Appl. Phys. Lett. , volume =
-
[43]
and Yasuda, R
Noji, H. and Yasuda, R. and Yoshida, M. and Kinosita, K. Jr. , journal =. Direct observation of the rotation of. 1997 , volume =
1997
-
[44]
and Klymko, Katherine and GrandPre, Trevor and Geissler, Phillip L
Omar, Ahmad K. and Klymko, Katherine and GrandPre, Trevor and Geissler, Phillip L. , title =. Physical Review Letters , year = 2021, volume = 126, number = 18, month = may, issn =. doi:10.1103/physrevlett.126.188002 , url =
2021 doi
-
[45]
Petroff, A. P. and Wu, X.-L. and Libchaber, A. , journal =. Fast-moving bacteria self-organize into active two-dimensional crystals of rotating cells , doi =. 2015 , volume =
2015
-
[46]
doi:10.1093/mnras/stu2416 , url =
Eliot Quataert and Tobias Heinemann and Anatoly Spitkovsky , title =. doi:10.1093/mnras/stu2416 , url =
-
[47]
, title =
Vega Reyes, Francisco and Santos, Andrés and Kremer, Gilberto M. , title =. Physical Review E , year = 2014, volume = 89, number = 2, month = feb, issn =. doi:10.1103/physreve.89.020202 , url =
2014 doi
-
[48]
Rosensweig, R. E. , title =
-
[49]
Rosensweig, R. E. and Popplewell, J. and Johnston, R. J. , title =. J. Magn. Magn. Mater. , volume =
-
[50]
Saville, D. A. , title =. Annu. Rev. Fluid Mech. , volume =
-
[51]
Shankar, P. N. and Deshpande, M. D. , title =. Annu. Rev. Fluid Mech. , volume =. 2000 , doi =
2000
-
[52]
Shliomis, M. I. , title =. Sov. Phys. JETP , volume =
-
[53]
Shliomis, M. I. , title =. Phys. Rev. Fluids , volume =
-
[54]
and Junge, W
Sielaff, H. and Junge, W. , journal =. Torque, chemistry and efficiency in molecular motors: a study of the rotary--chemical coupling in. 2015 , volume =
2015
-
[55]
and Aranson, I
Sokolov, A. and Aranson, I. S. and Kessler, J. O. and Goldstein, R. E. , journal =. Collective behavior of terminating bacteria , doi =. 2007 , volume =
2007
-
[56]
and Bililign, E
Soni, V. and Bililign, E. S. and Magkiriadou, S. and Sacanna, S. and Bartolo, D. and Shelley, M. J. and Irvine, W. T. M. , title =. Nat. Phys. , volume =
-
[57]
and Block, S
Svoboda, K. and Block, S. M. , journal =. Force and velocity measured for single kinesin molecules , doi =. 1994 , volume =
1994
-
[58]
Sweeney, H. L. and Houdusse, A. , journal =. Structural and functional insights into the myosin motor mechanism , doi =. 2010 , volume =
2010
-
[59]
Tan, T. H. and others , journal =. Odd dynamics of living chiral crystals , doi =. 2022 , volume =
2022
-
[60]
and Toupin, R
Truesdell, C. and Toupin, R. The Classical Field Theories. Principles of Classical Mechanics and Field Theory / Prinzipien der Klassischen Mechanik und Feldtheorie. 1960. doi:10.1007/978-3-642-45943-6_2
1960 doi
-
[61]
and Ye, Fangfu and Rodriguez, Juan and Gollub, J
Tsai, J.-C. and Ye, Fangfu and Rodriguez, Juan and Gollub, J. P. and Lubensky, T. C. , title =. Physical Review Letters , year = 2005, volume = 94, number = 21, month = May, issn =. doi:10.1103/physrevlett.94.214301 , url =
2005 doi
-
[62]
Vale, R. D. and Reese, T. S. and Sheetz, M. P. , journal =. Identification of a novel force-generating protein, kinesin, involved in microtubule-based motility , doi =. 1985 , volume =
1985
-
[63]
and Pérez, A
Vega, F. and Pérez, A. T. , title =. Physics of Fluids , year = 2002, volume = 14, number = 8, month = Aug, pages =. doi:10.1063/1.1488146 , url =
2002 doi
-
[64]
GitHub repository , howpublished =
Francisco. GitHub repository , howpublished =. 2026 , publisher =
2026
-
[65]
and Oster, G
Wang, H. and Oster, G. , journal =. Energy transduction in the. 1998 , volume =
1998
-
[66]
Wensink, H. H. and Dunkel, J. and Heidenreich, S. and Drescher, K. and Goldstein, R. E. and L. Meso-scale turbulence in living fluids , doi =. Proceedings of the National Academy of Sciences USA , year =
-
[67]
and Noji, H
Yasuda, R. and Noji, H. and Kinosita, K. Jr. and Yoshida, M. , journal =. 1998 , volume =
1998
-
[68]
Nature Reviews Molecular Cell Biology , year = 2001, volume = 2, number = 9, month = sep, pages =
Yoshida, Masasuke and Muneyuki, Eiro and Hisabori, Toru , title =. Nature Reviews Molecular Cell Biology , year = 2001, volume = 2, number = 9, month = sep, pages =. doi:10.1038/35089509 , url =
2001 doi
-
[69]
Zaitsev, V. M. and Shliomis, M. I. , title =. J. Appl. Mech. Tech. Phys. , volume =
-
[70]
The Journal of Chemical Physics , year = 2026, volume = 165, number = 3, pages = 034501, doi =
Maire, Rapha\"el and Petrini, Alessandro and Marini Bettolo Marconi, Umberto and Caprini, Lorenzo , title =. The Journal of Chemical Physics , year = 2026, volume = 165, number = 3, pages = 034501, doi =
2026
-
[73]
& Tsimring, Lev S
Aranson, Igor S. & Tsimring, Lev S. 2006 Patterns and collective behavior in granular media: Theoretical concepts . Reviews of Modern Physics 78 (2), 641–692
2006
-
[74]
Avron, J. E. 1998 Odd viscosity . Journal of Statistical Physics 92 (3–4), 543–557
1998
-
[75]
, Souslov, A
Banerjee, D. , Souslov, A. , Abanov, A. G. & Vitelli, V. 2017 Odd viscosity in chiral active fluids . Nature Communications 8 , 1573
2017
-
[76]
Batchelor, G. K. 1967 An Introduction to Fluid Dynamics\/ . Cambridge University Press
1967
-
[77]
, Izri, Z
Beppu, K. , Izri, Z. , Sato, T. , Yamanishi, Y. , Sumino, Y. & Maeda, Y. T. 2021 Edge current and pairing order transition in chiral bacterial vortices . Proceedings of the National Academy of Sciences USA 118 (39), e2107461118
2021
-
[78]
, Fakhri, Nikta , Marchetti, M
Bowick, Mark J. , Fakhri, Nikta , Marchetti, M. Cristina & Ramaswamy, Sriram 2022 Symmetry, thermodynamics, and topology in active matter . Physical Review X 12 (1)
2022
-
[79]
Boyer, P. D. 1997 The ATP synthase --- a splendid molecular machine . Annual Review of Biochemistry 66 , 717--749
1997
-
[80]
Braginskii, S. I. 1965 Transport processes in a plasma . In Reviews of Plasma Physics\/ (ed. M. A. Leontovich ) , , vol. 1 , pp. 205--311 . New York: Consultants Bureau , translated from the Russian
1965
-
[81]
Javier , Dufty, James W
Brey, J. Javier , Dufty, James W. , Kim, Chang Sub & Santos, Andrés 1998 Hydrodynamics for granular flow at low density . Physical Review E 58 (4), 4638–4653
1998
-
[82]
Brush, S. G. 1972 Kinetic theory\/ , International Series of Monographs in Natural Philosophy 42 , vol. 3 . Oxford, UK: Pergamon Press
1972
-
[83]
1966 Analytical and numerical studies of the structure of steady separated flows
Burggraf, Odus R. 1966 Analytical and numerical studies of the structure of steady separated flows . J. Fluid Mech. 24 (1), 113–151
1966
-
[84]
1935 The distribution of velocities in a slightly non-uniform gas
Burnett, D. 1935 The distribution of velocities in a slightly non-uniform gas . Proc. London Math. Soc. 39 , 385--430
1935
-
[85]
& Marini Bettolo Marconi, U
Caprini, L. & Marini Bettolo Marconi, U. 2025 Bubble phase induced by odd interactions in chiral systems . Journal of Chemical Physics 162 , 161101
2025
-
[86]
& Tailleur, Julien 2015 Motility-induced phase separation
Cates, Michael E. & Tailleur, Julien 2015 Motility-induced phase separation . Annual Review of Condensed Matter Physics 6 (1), 219–244
2015
-
[87]
New York: Dover Publications , originally published: Oxford University Press, 1961
Chandrasekhar, Subrahmanyan 1981 Hydrodynamic and Hydromagnetic Stability\/ . New York: Dover Publications , originally published: Oxford University Press, 1961
1981
-
[88]
& Cowling, T
Chapman, C. & Cowling, T. G. 1970 The Mathematical Theory of Non-Uniform Gases\/ , 3rd edn. Cambridge University Press, Cambridge
1970
-
[89]
, Rinaldi, C
Chaves, A. , Rinaldi, C. , Elborai, S. , He, X. & Zahn, M. 2006 Bulk flow in ferrofluids in a uniform rotating magnetic field . Phys. Rev. Lett. 96 , 194501
2006
-
[90]
& Dahler, John S
Condiff, Duane W. & Dahler, John S. 1964 Fluid mechanical aspects of antisymmetric stress . The Physics of Fluids 7 (6), 842--854
1964
-
[91]
Dahler, J. S. & Scriven, L. E. 1961 Angular momentum of continua . Nature 192 , 36--37
1961
-
[92]
, Löwen, Hartmut & Janssen M
Debets, Vincent E. , Löwen, Hartmut & Janssen M. C. , Liesbeth 2023 Glassy dynamics in chiral fluids . Physical Review Letters 130 (5)
2023
-
[93]
, Pagonabarraga, I
Di Gregorio, P. , Pagonabarraga, I. & Vega Reyes, F. 2026 Phase separation in a chiral active fluid of inertial self-spinning disks . Phys. Rev. Lett. 136 , 218301 , arXiv:2504.08533
2026 arXiv
-
[94]
, Gonnella, Giuseppe & Pagonabarraga, Ignacio 2018 Full phase diagram of active brownian disks: From melting to motility-induced phase separation
Digregorio, Pasquale , Levis, Demian , Suma, Antonio , Cugliandolo, Leticia F. , Gonnella, Giuseppe & Pagonabarraga, Ignacio 2018 Full phase diagram of active brownian disks: From melting to motility-induced phase separation . Physical Review Letters 121 (9)
2018
-
[95]
Eren, Ege , Fruchart, Michel & Vitelli, Vincenzo 2025 A collisional model of odd fluids: from B oltzmann equation to chiral hydrodynamics, arXiv:arXiv: 2508.12944
2025 arXiv
-
[96]
Eringen, A. C. 1966 Theory of micropolar fluids . J. Math. Mech. 16 , 1--18
1966
-
[97]
Ferziger, J. H. & Peri\'c, M. 2002 Computational Methods for Fluid Dynamics\/ , 3rd edn. Berlin: Springer
2002
-
[98]
Cambridge University Press
Frankel, Theodore 2012 The Geometry of Physics: An Introduction\/ , 3rd edn. Cambridge University Press
2012
-
[99]
, Fruchart, M
Han, M. , Fruchart, M. , Scheibner, C. , Vaikuntanathan, S. , de Pablo, J. J. & Vitelli, V. 2021 Fluctuating hydrodynamics of chiral active fluids . Nat. Phys. 17 , 1260--1269
2021
-
[100]
2017 Statistical mechanics of transport processes in active fluids: Equations of hydrodynamics
Klymko, Katherine , Mandal, Dibyendu & Mandadapu, Kranthi K. 2017 Statistical mechanics of transport processes in active fluids: Equations of hydrodynamics . The Journal of Chemical Physics 147 (19), 194109
2017
-
[101]
Lier, Ruben & Matus, Pawe 2026 C hapman-- E nskog expansion for chirally colliding disks, arXiv:arXiv: 2602.21367
2026
-
[102]
Physics Letters A 379 (22–23), 1425–1430
Lingam, Manasvi 2015 Hall viscosity: A link between quantum hall systems, plasmas and liquid crystals . Physics Letters A 379 (22–23), 1425–1430
2015
-
[103]
Proceedings of the National Academy of Sciences 119 (42)
Lou, Xin , Yang, Qing , Ding, Yu , Liu, Peng , Chen, Ke , Zhou, Xin , Ye, Fangfu , Podgornik, Rudolf & Yang, Mingcheng 2022 Odd viscosity-induced hall-like transport of an active chiral fluid . Proceedings of the National Academy of Sciences 119 (42)
2022
-
[104]
, Márquez Seco, Alejandro , Márquez Seco, Alicia , Rodríguez-Rivas, Álvaro & Reyes, Francisco Vega 2022 Chirality transitions in a system of active flat spinners
López-Castaño, Miguel A. , Márquez Seco, Alejandro , Márquez Seco, Alicia , Rodríguez-Rivas, Álvaro & Reyes, Francisco Vega 2022 Chirality transitions in a system of active flat spinners . Physical Review Research 4 (3)
2022
-
[105]
The Journal of Chemical Physics 165 (3), 034501 , arXiv:2603.04273
Maire, Rapha\"el , Petrini, Alessandro , Marini Bettolo Marconi, Umberto & Caprini, Lorenzo 2026 Kinetic theory of chiral active disks: Odd transport and torque density . The Journal of Chemical Physics 165 (3), 034501 , arXiv:2603.04273
2026 arXiv
-
[106]
Marchetti, M. C. , Joanny, J. F. , Ramaswamy, S. , Liverpool, T. B. , Prost, J. , Rao, Madan & Simha, R. Aditi 2013 Hydrodynamics of soft active matter . Reviews of Modern Physics 85 (3), 1143–1189
2013
-
[107]
New Journal of Physics 28 (6), 064401
Marini Bettolo Marconi, Umberto , Petrini, Alessandro , Maire, Raphael & Caprini, Lorenzo 2026 Emergent hydrodynamics of chiral active fluids: vortices, bubbles and odd diffusion . New Journal of Physics 28 (6), 064401
2026
-
[108]
2021 Odd viscosity in active matter: Microscopic origin and 3d effects
Markovich, Tomer & Lubensky, Tom C. 2021 Odd viscosity in active matter: Microscopic origin and 3d effects . Physical Review Letters 127 (4)
2021
-
[109]
New Journal of Physics 21 (11), 112001
Markovich, Tomer , Tjhung, Elsen & Cates, Michael E 2019 Chiral active matter: microscopic ‘torque dipoles’ have more than one hydrodynamic description . New Journal of Physics 21 (11), 112001
2019
-
[110]
Melcher, J. R. & Taylor, G. I. 1969 Electrohydrodynamics: a review of the role of interfacial shear stresses . Annu. Rev. Fluid Mech. 1 , 111--146
1969
-
[111]
& Rosensweig, R
Moskowitz, R. & Rosensweig, R. E. 1967 Nonmechanical torque-driven flow of a ferromagnetic fluid by an electromagnetic field . Appl. Phys. Lett. 11 , 301--303
1967
-
[112]
, Yasuda, R
Noji, H. , Yasuda, R. , Yoshida, M. & Kinosita, K. Jr. 1997 Direct observation of the rotation of F _1 - ATPase . Nature 386 , 299--302
1997
-
[113]
, Klymko, Katherine , GrandPre, Trevor & Geissler, Phillip L
Omar, Ahmad K. , Klymko, Katherine , GrandPre, Trevor & Geissler, Phillip L. 2021 Phase diagram of active brownian spheres: Crystallization and the metastability of motility-induced phase separation . Physical Review Letters 126 (18)
2021
-
[114]
Rosensweig, R. E. 1985 Ferrohydrodynamics\/ . Cambridge: Cambridge University Press
1985
-
[115]
Rosensweig, R. E. , Popplewell, J. & Johnston, R. J. 1990 Magnetic fluid motion in rotating field . J. Magn. Magn. Mater. 85 , 171--180
1990
-
[116]
Saville, D. A. 1997 Electrohydrodynamics: the T aylor-- M elcher leaky dielectric model . Annu. Rev. Fluid Mech. 29 , 27--64
1997
-
[117]
Shankar, P. N. & Deshpande, M. D. 2000 Fluid mechanics in the driven cavity . Annu. Rev. Fluid Mech. 32 , 93--136
2000
-
[118]
Shliomis, M. I. 1972 Effective viscosity of magnetic suspensions . Sov. Phys. JETP 34 , 1291--1294
1972
-
[119]
Shliomis, M. I. 2021 How a rotating magnetic field causes ferrofluid to rotate . Phys. Rev. Fluids 6 , 043701
2021
-
[120]
, Aranson, I
Sokolov, A. , Aranson, I. S. , Kessler, J. O. & Goldstein, R. E. 2007 Collective behavior of terminating bacteria . Physical Review Letters 98 , 158102
2007
-
[121]
, Bililign, E
Soni, V. , Bililign, E. S. , Magkiriadou, S. , Sacanna, S. , Bartolo, D. , Shelley, M. J. & Irvine, W. T. M. 2019 The odd free surface flows of a colloidal chiral fluid . Nat. Phys. 15 , 1188--1194
2019
-
[122]
Sweeney, H. L. & Houdusse, A. 2010 Structural and functional insights into the myosin motor mechanism . Annual Review of Biophysics 39 , 539--557
2010
-
[123]
, Ye, Fangfu , Rodriguez, Juan , Gollub, J
Tsai, J.-C. , Ye, Fangfu , Rodriguez, Juan , Gollub, J. P. & Lubensky, T. C. 2005 A chiral granular gas . Physical Review Letters 94 (21)
2005
-
[124]
Vale, R. D. , Reese, T. S. & Sheetz, M. P. 1985 Identification of a novel force-generating protein, kinesin, involved in microtubule-based motility . Cell 42 , 39--50
1985
-
[125]
& Pérez, A
Vega, F. & Pérez, A. T. 2002 Instability in a non-ohmic/ohmic fluid interface under a perpendicular electric field and unipolar injection . Physics of Fluids 14 (8), 2738–2751
2002
-
[126]
https://github.com/fvegar/chiral_stokes_cavity
Vega Reyes , Francisco 2026 The Chiral Stokes Cavity . https://github.com/fvegar/chiral_stokes_cavity
2026
-
[127]
2014 Role of roughness on the hydrodynamic homogeneous base state of inelastic spheres
Vega Reyes, Francisco , Santos, Andrés & Kremer, Gilberto M. 2014 Role of roughness on the hydrodynamic homogeneous base state of inelastic spheres . Physical Review E 89 (2)
2014
-
[128]
Nature Reviews Molecular Cell Biology 2 (9), 669–677
Yoshida, Masasuke , Muneyuki, Eiro & Hisabori, Toru 2001 Atp synthase — a marvellous rotary engine of the cell . Nature Reviews Molecular Cell Biology 2 (9), 669–677
2001
-
[129]
Zaitsev, V. M. & Shliomis, M. I. 1969 Entrainment of ferromagnetic suspension by a rotating field . J. Appl. Mech. Tech. Phys. 10 , 696--700
1969
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