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Cold and Fuzzy Dark Matter
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Cold dark matter (CDM) models predict small-scale structure in excess of observations of the cores and abundance of dwarf galaxies. These problems might be solved, and the virtues of CDM models retained, even without postulating {\it ad hoc} dark matter particle or field interactions, if the dark matter is composed of ultra-light scalar particles (m ~ 10^{-22}eV), initially in a (cold) Bose-Einstein condensate, similar to axion dark matter models. The wave properties of the dark matter stabilize gravitational collapse providing halo cores and sharply suppressing small-scale linear power.
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Showing 60 of 86 Pith papers that cite this
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Fuzzy Axions and Associated Relics
In explicit string theory compactifications, fuzzy axion dark matter is rare and typically requires fine-tuning of initial axion displacements or a non-standard reheating epoch to avoid overproducing heavier axions.
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Gravitational waves decay in vacuum
Coherent graviton states that make up classical gravitational waves decay into photon pairs at a rate enhanced by N squared, a purely quantum effect that yields tiny rates for binaries and first photon-injection bound...
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Dark Matter in Draco and Bo\"otes I: Hints of a Core in an Ultra-Faint Dwarf from Simulation-Based Inference
GraphNPE recovers a significantly lower central density for Boötes I consistent with a core while Draco remains marginally cuspy, and demonstrates that higher-order velocity moments reduce bias in dynamical modeling.
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Tunneling and tidal stripping in multifield ultralight dark matter halos
A semiclassical tunneling model shows that two-field ultralight DM halos have stability bounds that can be relaxed for some density-mass ratios but become more stringent across much of the parameter space compared to ...
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Tachyonic gravitational dark matter production after inflation
Tachyonic instabilities from post-inflation curvature reorganization via quadratic Gauss-Bonnet coupling produce the observed dark matter relic density across wide mass and scale ranges, backed by lattice simulations ...
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Growth of Structure in Multi-species Wave Dark Matter
Derives the power spectrum evolution and cross-spectra for arbitrary multi-species wave and particle dark matter, incorporating free-streaming, Jeans scales, and intrinsic fluctuations.
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Ultralight Boson Ionization from Comparable-Mass Binary Black Holes
Ionization of boson molecules bound to a black hole binary can dominate gravitational-wave losses during early inspiral, imprinting a turnover in the nanohertz GW background and circularizing the orbit.
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Generating Moving Field Initial Conditions with Spatially Varying Boost
A 'spatially varying boost' algorithm assigns arbitrary, position-dependent bulk velocities to field initial data by composing local Lorentz boosts, demonstrated on solitons, Proca fields, and spin-1 wave dark matter.
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Scattering of wave dark matter by supermassive black holes
A first-principles scattering calculation explains the co-rotating wave dark matter profile around supermassive black hole binaries and predicts resonant power peaks that could imprint on the pulsar timing array spectrum.
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Accurate method for ultralight axion CMB and matter power spectra
AxiECAMB computes CMB and matter power spectra for ultralight axions across 10^-33 to 10^-18 eV by time-averaging fast field oscillations, with metric and fluid matching that reduces errors far below cosmic variance f...
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Oscillating scalar fields and the Hubble tension: a resolution with novel signatures
A subdominant oscillating scalar field with about 10% energy density at redshift 3500 and a potential ∝ φ^{2n} (n≈3) can resolve the Hubble tension, with CMB-S4-detectable polarization signatures and self-resonance for n≈2.
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Probing the fate of large primordial perturbations with exoplanets
Observed ultra-wide exoplanets already constrain the amplitude and scale of primordial power-spectrum peaks that produce ultra-compact minihalos, with misalignment signatures as a future probe.
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Automatic detection of fast oscillations of dark matter scalar field and updated cosmological constraints on QCDM
An automatic algorithm in the CLASS Boltzmann code detects the onset of rapid oscillations in scalar-field dark matter and enables accurate averaging even with dark matter-dark energy interactions; updated QCDM constr...
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Production of Primordial Black Holes in the Double D3-Brane - anti-D3-Brane Inflation Model
In a double D3-anti-D3 brane inflation model, Myers dielectric effect may turn D1-strings into neutral 3-branes seeding primordial black holes, but the mass distribution is not derived.
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Spin-1 Ultralight Dark Matter under Cosmological Scrutiny: Mass Constraints from CMB and Distance Probes
Cosmological data place a lower bound near 10⁻²⁴ eV on spin-1 ultralight dark matter and predict a CMB anisotropy signature that may be detectable when the vector field is a minor dark-matter component.
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Extreme mass-ratio inspirals into Newtonian Proca stars
For Newtonian Proca stars, a perturbing object on a circular orbit loses nearly the same energy in the vector ground state as in the scalar boson-star ground state (within ~20%), while the spherical excited Proca stat...
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Dark matter density profiles of the Milky Way satellite population: reconciling simulations and observations
Fixed-physical-radius slope and full-profile comparisons of NIHAO/FIRE-2 satellites to 16 MW dwarfs show mass-dependent core formation and agreement within ~1σ for most systems, outperforming NFW.
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Vortex-reconnection energy bounds in Bose-Einstein-condensed and superfluid dark matter halos
Vortex reconnections in BEC/superfluid dark matter halos produce dark-sector heating at a rate that is secular but sub-virial for relaxed non-interacting soliton cores, with the dominant uncertainty being the true vor...
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Parametric Resonance of Higgsed Vector Dark Matter: Inflationary Initial Conditions and Sourced Displacements
Stochastic inflationary fluctuations cannot supply the large dark-Higgs displacement required for broad parametric resonance production of vector dark matter, but a classically sourced Hubble-induced minimum can, with...
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Spin Polarization of Proca Stars Formed by Gravitational Bose--Einstein Condensation
Gravitationally condensed Proca stars exhibit partial spin polarization controlled by the elliptical polarization of the dominant component-space mode, with ensemble mean χ_net ≈ 0.62 and large realization-to-realizat...
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Non-invertible symmetries in the axiverse, and the imaginary wormholes
Imaginary wormholes and the IDB imply that towers of BPS EFT instantons generate infinitely many superpotential terms that break non-invertible axion shift symmetries in N=1 axiverse models.
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Dark Matter as an Inflationary Relic in Warm Inflation
In warm inflation with Υ∝T³, a residual inflaton condensate after rapid drop in Q evolves as cold dark matter with mass fixed at m≈0.02 MeV by the observed abundance.
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Exact Solution of the Non-minimally Coupled Klein-Gordon Equation in the Schwarzschild Star
Exact solution of non-minimally coupled massive Klein-Gordon equation in Schwarzschild star metric expressed via general Heun function after geometry-induced coordinate transformation.
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Self-gravitating quantum stars with a globally relevant Bohm potential
The equilibrium radius of self-gravitating dark fermion stars is determined by the fermion mass once the total mass is given, with the Bohm potential supplying outward pressure for heavier species and inward tension f...
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Searching for axions with time resolved pulsar polarimetry
Time-resolved optical polarimetry of the Crab pulsar is used to place bounds on the axion-photon coupling via oscillating axion fields induced by the pulsar's magnetic field.
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Spacetime of rotating black holes surrounded by massive scalar charges
Spectral methods construct leading-order spinning black-hole spacetimes with massive scalar hair for spin a≤0.8 and scalar mass µ≤0.2/M.
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Fuzzy dark matter soliton core hosting a supermassive black hole as a dense low-mass perturber in strong gravitational lensing
A soliton core of fuzzy dark matter, compressed by an embedded supermassive black hole, reproduces the observed mass profile of the ~10^6 Msun perturber in JVAS B1938+666 for FDM mass ~3.6e-21 eV and subhalo mass ~7e6 Msun.
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Massive boson stars: Stability and GW emission in head-on mergers
Quartically self-interacting massive boson stars are stable only up to the first mass maximum; their head-on mergers yield a boson-star remnant, a black hole at contact, or two black holes formed before contact, with ...
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Ultralight Dark Matter from the Edge of Field Space
A scalar with hard field-space boundaries — a 'wallion' — is a viable ultralight dark-matter candidate whose exponentially small, radiatively stable mass and saturated relic density at large misalignment also suppress...
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Searching for dark photon dark matter from terrestrial magnetic fields
New upper limits on the dark photon kinetic mixing parameter ε are derived from geomagnetic data for masses between 1e-15 and 2e-13 eV, improving prior ground-based constraints.
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Updated bounds on ultra-light dark matter from the tiniest galaxies
If Ursa Major III/UNIONS 1 is a galaxy, ultra-light dark matter particles must be heavier than 8 x 10^-18 eV, the strongest such bound.
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Amplifying muon-to-positron conversion in nuclei with ultralight dark matter
Ultralight scalar dark matter amplifies the lepton-flavor-violating muon-to-positron conversion rate via an effective Majorana mass m_μe, yielding new constraints on flavor-off-diagonal neutrino couplings from SINDRUM...
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Kinematic Imprints of vortex-lines of BEC Dark Matter on Baryonic Matter
Numerical GPP-Euler simulations show BECDM vortex lines stay stable under baryonic collapse, seed gas condensation, and imprint ring-like features that could serve as observational tracers.
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Bounds on PBH fraction in a stimulated axion/ALP decay scenario
Stimulated axion decay around superradiant primordial black holes yields photon fluxes that exceed observed backgrounds, forcing f_PBH < 10^-17 for PBH masses 10^-19 to 10^-7 solar masses.
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Early Growth of Structure in Warm Wave Dark Matter
Derives suppression of adiabatic perturbations and scale-dependent growth of isocurvature power in warm wave dark matter, verifies with Schrödinger-Poisson simulations, and proposes an analytic halo mass function.
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Dark Matter-Independent Orbital Decay Bounds on Ultralight Bosons from OJ287
OJ287 orbital timing excludes ultralight scalar bosons with masses around 0.85 to 2.2 x 10^-21 eV through superradiance-cloud dynamical friction, independent of dark matter assumptions.
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Non-minimally coupled scalar field dark sector of the universe: in-depth (Einstein frame) case study
A complete dynamical-systems stability map for five non-minimally coupled scalar-field dark-energy models, including the negative-potential regime that generically drives the universe to H=0.
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Exploring Ultralight Dark Matter Self-Coupling via the Gravitational Wave Background
Soliton dynamical friction from self-interacting ultralight dark matter can create dips in the nanohertz gravitational wave spectrum, and current PTA measurements may already constrain the self-coupling strength for m...
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Machine Learning-Based Analytical Expressions for Gray-Body Factors and Application to Primordial Black Holes
Symbolic regression is used to derive compact error-function approximations for Schwarzschild gray-body factors, and the approximations reproduce the Hawking spectra and primordial black hole constraints from full num...
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Supermassive Binaries in Ultralight Dark Matter Solitons
High-resolution simulations show that a symmetric SMBH binary decays faster in a ULDM soliton than semi-analytic estimates predict, due to soliton pinching, with implications for the final parsec problem and PTA gravi...
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Superheavy Dark Matter from the String Theory Axiverse
Heavy axions from a simple string-theory compactification can be produced in large numbers by gravitational particle production at the end of inflation and can account for all dark matter, provided they remain stable ...
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Searching for coupled, hyperlight scalars across cosmic history
Hyperlight quadratically coupled scalars making up a few percent of dark matter are bounded to near- or sub-gravitational couplings to electrons and photons over 10^-31 to 10^-28 eV, with quasar spectra setting the st...
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Dark Photon Polarimetry
Dark photon polarimetry uses Faraday rotation of light from M87* and Sgr A* to set new limits on ultralight dark photon kinetic mixing.
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Bifurcations in Bosonic Stars: chains and rings from spherical solutions
Zero-modes of spherical bosonic stars under axisymmetric perturbations explain the bifurcations into chain, ring, and gyroscope-like bosonic star families.
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Vortices and rotating solitons in ultralight dark matter
Rotating solitons in self-interacting ultralight dark matter form through a uniform vortex lattice, with a maximum radius about 1.59 times and a maximum rotation rate about 1.34 times the square root of the central density.
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Forecast constraints on the axion-photon coupling from interstellar medium heating
Axion dark matter resonantly heats interstellar plasma when its mass matches the plasma frequency, yielding forecast upper limits on the axion-photon coupling g as strong as about 2e-14 GeV^-1 for a 1 microgauss field.
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Probing time-dependent scalar wigs with extreme mass ratio inspirals
For EMRIs where the smaller black hole carries an oscillating scalar cloud with mass 0.001 <= mu_s m_p <= 0.02, the scalar energy flux is negligible, so the inspiral and gravitational waveform are essentially unchanged.
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Free streaming of warm wave dark matter in modified expansion histories
Warm wave dark matter free streaming can shift by up to roughly 40% in a very early dark energy cosmology, while early matter domination moves the signal to unobservably small scales.
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Formation of solitons and their transitions in scalar-field dark matter models with a non-polynomial self-interaction potential
A saturating scalar self-interaction lets dark matter halos form Thomas-Fermi solitons, fuzzy solitons, or transitions between them, with even subdominant interactions seeding fuzzy solitons.
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Diversity of Fuzzy Dark Matter Solitons
Environmental effects, especially a central black hole and baryonic matter, can substantially alter fuzzy dark matter soliton profiles, while the soliton's own gravitomagnetic field is negligible.
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Soliton self-gravity and core-halo relation in fuzzy dark matter halos
A two-parameter model including soliton self-gravity shows that simulated fuzzy dark matter cores sit between the self-gravity and host-halo regimes, and that core-halo scatter depends on both halo concentration and c...
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Fate of scalar dark matter solitons around supermassive galactic black holes
A self-interacting scalar dark matter soliton around a supermassive black hole settles into a unique critical accretion flow with flux ~ r_s^2 m^4 / λ4 and survives for many Hubble times.
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The Speed of Gravity
In the standard effective field theory of gravity, gravitational waves on cosmological backgrounds propagate at a speed differing from unity, and analyticity arguments favor superluminal speed relative to matter.
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Particle Probes with Superradiant Pulsars
The existence of PSR J1748-2446ad and PSR B1937+21 excludes ultralight scalars coupled to neutrons with masses near 10^-11 eV at couplings as small as 10^-6 times gravity.
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Quantum break in models of axion dark matter
A modified mean-field analysis predicts that axion dark matter can undergo a quantum break into photon pairs, with multi-mode synchronization counteracting red-shift detuning.
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Convexity criterion and radial-profile response for off-shell Kerr geometries: a fuzzy-dark-matter profile as an analytic benchmark
The paper proves a sufficient convexity criterion for off-shell Kerr radial mass profiles and derives first-order horizon, photon-sphere, and shadow responses for a fuzzy-dark-matter-inspired benchmark.
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Quantum corrections as a Bound for Detecting Self-Interacting Ultralight Dark Matter
Radiative stability of the SIULDM potential under Yukawa couplings to SM fermions yields upper bounds on y that already intersect the projected reach of optical and nuclear clocks.
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Time-dependent adaptive mesh refinement solver for the Gross-Pitaevskii-Poisson equations
A new AMR solver for the time-dependent GPP system is developed and validated on nonlinear test problems, preserving conservation laws and resolving wave features.
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Spherical Collapse and Halo Formation in a Cosmology with Decaying Dark Matter and a Semi-Cosmographic Dark Energy
In a decaying dark matter plus semi-cosmographic dark energy cosmology constrained by DESI BAO and ShapeFit, the spherical collapse threshold stays close to the ΛCDM value while massive halo abundance shows pronounced...
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Symbiotic Magnetogenesis during Radiation Domination
A symbiotic axion-dilaton system sources a moderately chiral dark U(1) magnetic field of astrophysically relevant strength during radiation domination through tachyonic amplification without fine-tuning.
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