pith. sign in

arxiv: 2503.17840 · v4 · submitted 2025-03-22 · ✦ hep-th · astro-ph.CO· gr-qc· hep-ph

Strongly Coupled Sectors in Inflation: Gapless Theories and Unparticles

Guilherme L. Pimentel , Chen Yang This is my paper

Pith reviewed 2026-05-22 22:44 UTC · model grok-4.3

classification ✦ hep-th astro-ph.COgr-qchep-ph
keywords inflationunparticlesbispectrumtrispectrumde Sitter spacecorrelation functionsscaling dimensionspectator fields
0
0 comments X

The pith

Unparticles during inflation produce bispectra whose full shapes, not squeezed limits, are required to distinguish them from light particles.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper computes how primordial density perturbations couple to a gapless strongly coupled spectator sector of unparticles during inflation. It first derives the four-point function of conformally coupled scalars exchanging an unparticle at tree level in de Sitter space using Mellin-Barnes integration, then applies weight-shifting operators to obtain the inflationary bispectra and trispectra. These correlators satisfy differential equations fixed by extra symmetries of the unparticle propagator. The authors classify three characteristic bispectrum shapes depending on the scaling dimension and conclude that leading-order squeezed limits alone cannot conclusively detect light particles versus unparticles.

Core claim

We compute the correlation functions of primordial perturbations coupled to unparticles by deriving the four-point function for conformally coupled scalars exchanging an unparticle via direct Mellin-Barnes integration. Weight-shifting and spin-raising operators applied to this correlator generate the bispectra and trispectra, which solve differential equations set by the unparticle propagator symmetries. For spinning cases, currents or the stress tensor of unparticles are coupled to inflatons. The resulting shapes depend on the scaling dimension, yielding three classes: near-equilateral, near-orthogonal, and a novel form near half-integers, with the result that only the full shapes break the

What carries the argument

Weight-shifting and spin-raising operators applied to the tree-level unparticle exchange four-point function in de Sitter, which solve differential equations determined by the additional symmetries of the unparticle propagator.

If this is right

  • Trispectra from the same exchanges supply independent information to resolve the light-particle versus unparticle degeneracy.
  • When the scaling dimension approaches half-integers, the novel bispectrum shape appears and can be targeted in data.
  • Coupling unparticle currents or the stress tensor produces spinning exchanges whose correlators are obtained via spin-raising operators.
  • The three shape classes enable specific template searches in CMB observations for gapless strongly coupled sectors.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • CMB analyses should move beyond squeezed-limit approximations and perform full-shape fitting to search for such sectors.
  • The same operator methods could be applied to other gapless spectator models in cosmology to generate their correlators.
  • Numerical templates of the classified shapes could be used to place bounds on unparticle scaling dimensions from existing Planck data.

Load-bearing premise

The unparticle sector can be modeled as tree-level exchanges of conformally coupled scalars in de Sitter space whose propagator possesses extra symmetries that fix differential equations for the correlators.

What would settle it

A CMB bispectrum measurement whose squeezed limit is consistent with both a light particle and an unparticle but whose full shape across all configurations matches neither the standard light-particle templates nor any of the three unparticle classes would falsify the claim that full shapes alone break the degeneracy.

read the original abstract

We compute correlation functions of the primordial density perturbations when they couple to a gapless, strongly coupled sector of spectator fields -- ``unparticles" -- during inflation. We first derive a four-point function of conformally coupled scalars for all kinematic configurations in de Sitter, which exchanges an unparticle at tree-level, by performing direct integration using the Mellin-Barnes method. To obtain inflationary bispectra and trispectra, we apply weight-shifting operators to the conformally coupled scalar correlator. We show that the correlators solve differential equations determined by the additional symmetries enjoyed by the unparticle propagator. Based on these differential equations, we are able to discuss the spinning-unparticle exchanges, focusing on two possible cases where the currents or the stress tensor of unparticles are coupled to inflatons, with the help of spin-raising operators. Finally, we study the phenomenology of the resulting shape functions. Depending on the value of the unparticle scaling dimension, we classify three characteristic shapes for the inflationary bispectra, including near-equilateral, near-orthogonal, and a novel shape which appears when the scaling dimensions are close to half-integers. More generally, we find that the leading order squeezed limits are insufficient to conclusively determine the detection of a light particle or unparticle. Only the full shapes of bispectra and trispectra can break this degeneracy.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript computes the four-point function of conformally coupled scalars exchanging an unparticle at tree level in de Sitter space using the Mellin-Barnes method for all kinematic configurations. It then applies weight-shifting operators to obtain inflationary bispectra and trispectra, and spin-raising operators for spinning unparticle exchanges (currents or stress tensor). The correlators are shown to satisfy differential equations from symmetries of the unparticle propagator. The authors classify three characteristic bispectrum shapes depending on the unparticle scaling dimension (near-equilateral, near-orthogonal, and a novel shape near half-integers) and conclude that leading-order squeezed limits cannot distinguish light particles from unparticles, while the full shapes of bispectra and trispectra can break this degeneracy.

Significance. If the modeling holds, the work provides a concrete computational framework for non-Gaussianities from gapless strongly coupled spectator sectors during inflation, including explicit shape functions derived via Mellin-Barnes integration and operator methods. The classification of shapes and the argument that full correlator shapes (rather than squeezed limits alone) are required for detection are potentially useful for connecting theoretical constructions of unparticles to observational searches for primordial non-Gaussianity.

major comments (1)
  1. [Abstract (and the derivation of the 4pt function and differential equations)] The central claims about the shape functions and the squeezed-limit degeneracy rest on the tree-level exchange computation and the differential equations derived from additional symmetries of the unparticle propagator. The abstract states that these symmetries are used to determine the equations solved by the correlators, but it is unclear whether this construction (tree-level exchange of a conformally coupled scalar propagator) accurately captures a strongly coupled unparticle sector; if the symmetries or the free-field modeling do not extend, the resulting shapes and degeneracy-breaking conclusion do not apply. This assumption is load-bearing for the phenomenology section.
minor comments (2)
  1. [Phenomenology of the resulting shape functions] The three characteristic shapes are classified by scaling dimension, but explicit comparisons (e.g., overlap with standard templates or quantitative measures of distinctness) would strengthen the phenomenology discussion.
  2. [Computation of the 4pt function] The manuscript would benefit from a brief discussion of the range of validity of the Mellin-Barnes integration and any numerical cross-checks performed on the 4pt function.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful review and for highlighting the importance of clarifying the modeling assumptions in our work. We address the major comment below, providing a substantive response and indicating revisions to improve clarity.

read point-by-point responses

  1. Referee: [Abstract (and the derivation of the 4pt function and differential equations)] The central claims about the shape functions and the squeezed-limit degeneracy rest on the tree-level exchange computation and the differential equations derived from additional symmetries of the unparticle propagator. The abstract states that these symmetries are used to determine the equations solved by the correlators, but it is unclear whether this construction (tree-level exchange of a conformally coupled scalar propagator) accurately captures a strongly coupled unparticle sector; if the symmetries or the free-field modeling do not extend, the resulting shapes and degeneracy-breaking conclusion do not apply. This assumption is load-bearing for the phenomenology section.

    Authors: The unparticle construction, following Georgi, is an effective description of a strongly coupled, approximately scale-invariant sector whose two-point function is fixed by the scaling dimension Δ (with higher correlators determined by the same symmetry). Our tree-level exchange assumes weak inflaton-unparticle coupling, which is the standard perturbative treatment for spectator sectors; the external legs are conformally coupled scalars, while the exchanged object carries the unparticle propagator. The differential equations follow directly from the conformal Ward identities satisfied by this propagator, independent of an underlying free-field UV completion. This effective approach is consistent with existing literature on unparticles in de Sitter. We agree that the abstract and introduction could state these modeling assumptions more explicitly. We will revise the abstract to emphasize the effective nature of the unparticle sector and add a short paragraph in Section 2 discussing the validity of the tree-level approximation and the role of the symmetries. revision: yes

Circularity Check

0 steps flagged

No circularity: explicit integration and operator application yield independent shape functions

full rationale

The derivation begins with a direct Mellin-Barnes integration to obtain the 4pt function of conformally coupled scalars exchanging an unparticle at tree level, followed by application of weight-shifting and spin-raising operators. The resulting bispectrum and trispectrum shapes are then inspected to classify characteristic forms and to compare squeezed limits against full shapes. These steps constitute an explicit computation from stated modeling assumptions rather than any self-definition, fitted parameter renamed as prediction, or load-bearing self-citation chain. The central claim follows from the computed shapes and is not forced by construction. The paper is therefore self-contained.

Axiom & Free-Parameter Ledger

1 free parameters · 2 axioms · 1 invented entities

The computations depend on modeling the spectator sector as unparticles with a continuous scaling dimension and assuming tree-level exchanges in de Sitter space with specific symmetries.

free parameters (1)
  • unparticle scaling dimension
    This parameter controls the form of the correlators and the resulting shapes of the bispectra and trispectra.
axioms (2)
  • domain assumption The background is de Sitter space during inflation
    Basis for computing the four-point function of conformally coupled scalars.
  • domain assumption Unparticle propagator possesses additional symmetries
    Enables the correlators to solve specific differential equations.
invented entities (1)
  • unparticles no independent evidence
    purpose: Model for gapless strongly coupled spectator fields
    Theoretical construct introduced to represent strongly coupled sectors without mass gap.

pith-pipeline@v0.9.0 · 5777 in / 1425 out tokens · 61985 ms · 2026-05-22T22:44:44.130649+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Strongly Coupled Sectors in Inflation: Gapped Theories of Unparticles

    hep-th 2025-12 unverdicted novelty 7.0

    Compactified 5D unparticle theories generate gapped excitations whose exchange in inflationary correlators yields oscillations modulated by anomalous dimensions and possible interference patterns under brane-localized...

  2. Kinematic Flow for Banana Loops and Unparticles

    hep-th 2026-04 unverdicted novelty 6.0

    Banana loop cosmological correlators are captured by master integrals from tubings of marked graphs, with connection matrices derived from activation, merger, swap, and copy rules unique to unparticle exchanges.

  3. Massive Exchange and the Sign of the Equilateral Bispectrum

    hep-th 2026-04 unverdicted novelty 6.0

    The equilateral bispectrum from massive scalar exchange in inflation is not universally negative in the full EFT of inflation; its sign depends on a critical ratio of operator coefficients.

  4. An Alternative Viewpoint on Kinematic Flow from Tubing Splitting

    hep-th 2026-05 unverdicted novelty 3.0

    Reversing the direction of tubing evolution yields splitting rules that reproduce the kinematic flow differential equations at tree level and suggest time emerges from kinematic space in conformally coupled scalar mod...

Reference graph

Works this paper leans on

110 extracted references · 110 canonical work pages · cited by 4 Pith papers · 72 internal anchors

  1. [1]

    The Effective Field Theory of Inflation

    C. Cheung, P. Creminelli, A. L. Fitzpatrick, J. Kaplan, and L. Senatore, “The Effective Field Theory of Inflation,”JHEP03(2008) 014,arXiv:0709.0293 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  2. [2]

    TASI Lectures on Inflation

    D. Baumann, “Inflation,” inTheoretical Advanced Study Institute in Elementary Particle Physics: Physics of the Large and the Small, pp. 523–686. 2011.arXiv:0907.5424 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2011

  3. [3]

    Non-Gaussianity as a Particle Detector

    H. Lee, D. Baumann, and G. L. Pimentel, “Non-Gaussianity as a Particle Detector,”JHEP12 (2016) 040,arXiv:1607.03735 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2016

  4. [4]

    Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation

    X. Chen and Y. Wang, “Large non-Gaussianities with Intermediate Shapes from Quasi-Single Field Inflation,”Phys. Rev. D81(2010) 063511,arXiv:0909.0496 [astro-ph.CO]

    work page internal anchor Pith review Pith/arXiv arXiv 2010

  5. [5]

    Quasi-Single Field Inflation and Non-Gaussianities

    X. Chen and Y. Wang, “Quasi-Single Field Inflation and Non-Gaussianities,”JCAP04(2010) 027,arXiv:0911.3380 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2010

  6. [6]

    Primordial Non-Gaussianities from Inflation Models

    X. Chen, “Primordial Non-Gaussianities from Inflation Models,”Adv. Astron.2010(2010) 638979,arXiv:1002.1416 [astro-ph.CO]

    work page internal anchor Pith review Pith/arXiv arXiv 2010

  7. [7]

    Signatures of Supersymmetry from the Early Universe

    D. Baumann and D. Green, “Signatures of Supersymmetry from the Early Universe,”Phys. Rev. D85(2012) 103520,arXiv:1109.0292 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2012

  8. [8]

    On Soft Limits of Inflationary Correlation Functions

    V. Assassi, D. Baumann, and D. Green, “On Soft Limits of Inflationary Correlation Functions,” JCAP11(2012) 047,arXiv:1204.4207 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2012

  9. [9]

    Effective field theory approach to quasi-single field inflation and effects of heavy fields

    T. Noumi, M. Yamaguchi, and D. Yokoyama, “Effective field theory approach to quasi-single field inflation and effects of heavy fields,”JHEP06(2013) 051,arXiv:1211.1624 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2013

  10. [10]

    Cosmological Collider Physics

    N. Arkani-Hamed and J. Maldacena, “Cosmological Collider Physics,”arXiv:1503.08043 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv

  11. [11]

    Non-Gaussian features of primordial fluctuations in single field inflationary models

    J. M. Maldacena, “Non-Gaussian features of primordial fluctuations in single field inflationary models,”JHEP05(2003) 013,arXiv:astro-ph/0210603

    work page internal anchor Pith review Pith/arXiv arXiv 2003

  12. [12]

    The Cosmological Bootstrap: Inflationary Correlators from Symmetries and Singularities,

    N. Arkani-Hamed, D. Baumann, H. Lee, and G. L. Pimentel, “The Cosmological Bootstrap: Inflationary Correlators from Symmetries and Singularities,”JHEP04(2020) 105, arXiv:1811.00024 [hep-th]

    work page arXiv 2020

  13. [13]

    The cosmological bootstrap: weight-shifting operators and scalar seeds,

    D. Baumann, C. Duaso Pueyo, A. Joyce, H. Lee, and G. L. Pimentel, “The cosmological bootstrap: weight-shifting operators and scalar seeds,”JHEP12(2020) 204,arXiv:1910.14051 [hep-th]

    work page arXiv 2020

  14. [14]

    The Cosmological Bootstrap: Spinning Correlators from Symmetries and Factorization,

    D. Baumann, C. Duaso Pueyo, A. Joyce, H. Lee, and G. L. Pimentel, “The Cosmological Bootstrap: Spinning Correlators from Symmetries and Factorization,”SciPost Phys.11(2021) 071,arXiv:2005.04234 [hep-th]

    work page arXiv 2021

  15. [15]

    Continuous spectrum on cosmological collider,

    S. Aoki, “Continuous spectrum on cosmological collider,”JCAP04(2023) 002, arXiv:2301.07920 [hep-th]

    work page arXiv 2023

  16. [16]

    Implications of Dynamical Symmetry Breaking,

    S. Weinberg, “Implications of Dynamical Symmetry Breaking,”Phys. Rev. D13(1976) 974–996. [Addendum: Phys.Rev.D 19, 1277–1280 (1979)]

    work page 1976

  17. [17]

    Dynamics of Spontaneous Symmetry Breaking in the Weinberg-Salam Theory,

    L. Susskind, “Dynamics of Spontaneous Symmetry Breaking in the Weinberg-Salam Theory,” Phys. Rev. D20(1979) 2619–2625

    work page 1979

  18. [18]

    SU(2) x U(1) Breaking by Vacuum Misalignment,

    D. B. Kaplan and H. Georgi, “SU(2) x U(1) Breaking by Vacuum Misalignment,”Phys. Lett. B 136(1984) 183–186

    work page 1984

  19. [19]

    Composite Higgs Scalars,

    D. B. Kaplan, H. Georgi, and S. Dimopoulos, “Composite Higgs Scalars,”Phys. Lett. B136 (1984) 187–190. 36

    work page 1984

  20. [20]

    Anatomy of a Composite Higgs Model,

    M. J. Dugan, H. Georgi, and D. B. Kaplan, “Anatomy of a Composite Higgs Model,”Nucl. Phys. B254(1985) 299–326

    work page 1985

  21. [21]

    The Higgs boson from an extended symmetry

    R. Barbieri, B. Bellazzini, V. S. Rychkov, and A. Varagnolo, “The Higgs boson from an extended symmetry,”Phys. Rev. D76(2007) 115008,arXiv:0706.0432 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  22. [22]

    Composite Higgses

    B. Bellazzini, C. Cs´ aki, and J. Serra, “Composite Higgses,”Eur. Phys. J. C74no. 5, (2014) 2766, arXiv:1401.2457 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2014

  23. [23]

    The Composite Nambu-Goldstone Higgs

    G. Panico and A. Wulzer,The Composite Nambu-Goldstone Higgs, vol. 913. Springer, 2016. arXiv:1506.01961 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2016

  24. [24]

    Composite Higgs theory,

    F. Goertz, “Composite Higgs theory,”PoSALPS2018(2018) 012,arXiv:1812.07362 [hep-ph]

    work page arXiv 2018

  25. [25]

    Seeing Higher-Dimensional Grand Unification In Primordial Non-Gaussianities

    S. Kumar and R. Sundrum, “Seeing Higher-Dimensional Grand Unification In Primordial Non-Gaussianities,”JHEP04(2019) 120,arXiv:1811.11200 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2019

  26. [26]

    Cosmological quasiparticles and the cosmological collider,

    J. Hubisz, S. J. Lee, H. Li, and B. Sambasivam, “Cosmological quasiparticles and the cosmological collider,”Phys. Rev. D111no. 2, (2025) 023543,arXiv:2408.08951 [astro-ph.CO]

    work page arXiv 2025

  27. [27]

    Anomalous Dimensions and Non-Gaussianity

    D. Green, M. Lewandowski, L. Senatore, E. Silverstein, and M. Zaldarriaga, “Anomalous Dimensions and Non-Gaussianity,”JHEP10(2013) 171,arXiv:1301.2630 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2013

  28. [28]

    Primordial Non-Gaussianity from Light Compact Scalars,

    P. Chakraborty, “Primordial Non-Gaussianity from Light Compact Scalars,”arXiv:2501.07672 [hep-th]

    work page arXiv

  29. [29]

    Productive Interactions: heavy particles and non-Gaussianity

    R. Flauger, M. Mirbabayi, L. Senatore, and E. Silverstein, “Productive Interactions: heavy particles and non-Gaussianity,”JCAP10(2017) 058,arXiv:1606.00513 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2017

  30. [30]

    Bodas, S

    A. Bodas, S. Kumar, and R. Sundrum, “The Scalar Chemical Potential in Cosmological Collider Physics,”JHEP02(2021) 079,arXiv:2010.04727 [hep-ph]

    work page arXiv 2021

  31. [31]

    Thermodynamics of Black Holes in anti-De Sitter Space,

    S. W. Hawking and D. N. Page, “Thermodynamics of Black Holes in anti-De Sitter Space,” Commun. Math. Phys.87(1983) 577

    work page 1983

  32. [32]

    Constant Curvature Black Holes

    M. Banados, “Constant curvature black holes,”Phys. Rev. D57(1998) 1068–1072, arXiv:gr-qc/9703040

    work page internal anchor Pith review Pith/arXiv arXiv 1998

  33. [33]

    The Large N Limit of Superconformal Field Theories and Supergravity

    J. M. Maldacena, “The Large N limit of superconformal field theories and supergravity,”Adv. Theor. Math. Phys.2(1998) 231–252,arXiv:hep-th/9711200

    work page internal anchor Pith review Pith/arXiv arXiv 1998

  34. [34]

    Anti De Sitter Space And Holography

    E. Witten, “Anti-de Sitter space and holography,”Adv. Theor. Math. Phys.2(1998) 253–291, arXiv:hep-th/9802150

    work page internal anchor Pith review Pith/arXiv arXiv 1998

  35. [35]

    Anti-de Sitter space and black holes

    M. Banados, A. Gomberoff, and C. Martinez, “Anti-de Sitter space and black holes,”Class. Quant. Grav.15(1998) 3575–3598,arXiv:hep-th/9805087

    work page internal anchor Pith review Pith/arXiv arXiv 1998

  36. [36]

    Anti-de Sitter Space, Thermal Phase Transition, And Confinement In Gauge Theories

    E. Witten, “Anti-de Sitter space, thermal phase transition, and confinement in gauge theories,” Adv. Theor. Math. Phys.2(1998) 505–532,arXiv:hep-th/9803131

    work page internal anchor Pith review Pith/arXiv arXiv 1998

  37. [37]

    Gauge/gravity correspondence in accelerating universe

    A. Buchel, “Gauge / gravity correspondence in accelerating universe,”Phys. Rev. D65(2002) 125015,arXiv:hep-th/0203041

    work page internal anchor Pith review Pith/arXiv arXiv 2002

  38. [38]

    On Time-dependent Backgrounds in Supergravity and String Theory

    A. Buchel, P. Langfelder, and J. Walcher, “On time dependent backgrounds in supergravity and string theory,”Phys. Rev. D67(2003) 024011,arXiv:hep-th/0207214

    work page internal anchor Pith review Pith/arXiv arXiv 2003

  39. [39]

    Clean Time-Dependent String Backgrounds from Bubble Baths

    O. Aharony, M. Fabinger, G. T. Horowitz, and E. Silverstein, “Clean time dependent string backgrounds from bubble baths,”JHEP07(2002) 007,arXiv:hep-th/0204158

    work page internal anchor Pith review Pith/arXiv arXiv 2002

  40. [40]

    The dual of nothing

    V. Balasubramanian and S. F. Ross, “The Dual of nothing,”Phys. Rev. D66(2002) 086002, arXiv:hep-th/0205290. 37

    work page internal anchor Pith review Pith/arXiv arXiv 2002

  41. [41]

    Constant Curvature Black Hole and Dual Field Theory

    R.-G. Cai, “Constant curvature black hole and dual field theory,”Phys. Lett. B544(2002) 176–182,arXiv:hep-th/0206223

    work page internal anchor Pith review Pith/arXiv arXiv 2002

  42. [42]

    Towards a Big Crunch Dual

    T. Hertog and G. T. Horowitz, “Towards a big crunch dual,”JHEP07(2004) 073, arXiv:hep-th/0406134

    work page internal anchor Pith review Pith/arXiv arXiv 2004

  43. [43]

    Time-dependent spacetimes in AdS/CFT: Bubble and black hole

    S. F. Ross and G. Titchener, “Time-dependent spacetimes in AdS/CFT: Bubble and black hole,” JHEP02(2005) 021,arXiv:hep-th/0411128

    work page internal anchor Pith review Pith/arXiv arXiv 2005

  44. [44]

    The dS/dS Correspondence

    M. Alishahiha, A. Karch, E. Silverstein, and D. Tong, “The dS/dS correspondence,”AIP Conf. Proc.743no. 1, (2004) 393–409,arXiv:hep-th/0407125

    work page internal anchor Pith review Pith/arXiv arXiv 2004

  45. [45]

    Holographic Description of AdS Cosmologies

    T. Hertog and G. T. Horowitz, “Holographic description of AdS cosmologies,”JHEP04(2005) 005,arXiv:hep-th/0503071

    work page internal anchor Pith review Pith/arXiv arXiv 2005

  46. [46]

    Much Ado About Nothing

    V. Balasubramanian, K. Larjo, and J. Simon, “Much ado about nothing,”Class. Quant. Grav.22 (2005) 4149–4170,arXiv:hep-th/0502111

    work page internal anchor Pith review Pith/arXiv arXiv 2005

  47. [47]

    A Holographic Dual of CFT with Flavor on de Sitter Space

    T. Hirayama, “A Holographic dual of CFT with flavor on de Sitter space,”JHEP06(2006) 013, arXiv:hep-th/0602258

    work page internal anchor Pith review Pith/arXiv arXiv 2006

  48. [48]

    On Bubbles of Nothing in AdS/CFT

    J. He and M. Rozali, “On bubbles of nothing in AdS/CFT,”JHEP09(2007) 089, arXiv:hep-th/0703220

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  49. [49]

    Colored Unparticles

    G. Cacciapaglia, G. Marandella, and J. Terning, “Colored Unparticles,”JHEP01(2008) 070, arXiv:0708.0005 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  50. [50]

    The AdS/CFT/Unparticle Correspondence

    G. Cacciapaglia, G. Marandella, and J. Terning, “The AdS/CFT/Unparticle Correspondence,” JHEP02(2009) 049,arXiv:0804.0424 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2009

  51. [51]

    Real time response on dS_3: the Topological AdS Black Hole and the Bubble

    J. A. Hutasoit, S. P. Kumar, and J. Rafferty, “Real time response on dS(3): The Topological AdS Black Hole and the Bubble,”JHEP04(2009) 063,arXiv:0902.1658 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2009

  52. [52]

    Holographic models of de Sitter QFTs

    D. Marolf, M. Rangamani, and M. Van Raamsdonk, “Holographic models of de Sitter QFTs,” Class. Quant. Grav.28(2011) 105015,arXiv:1007.3996 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2011

  53. [53]

    Vacuum decay into Anti de Sitter space

    J. Maldacena, “Vacuum decay into Anti de Sitter space,”arXiv:1012.0274 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv

  54. [54]

    The Thermal Bath of de Sitter from Holography

    C.-S. Chu and D. Giataganas, “Thermal bath in de Sitter space from holography,”Phys. Rev. D 96no. 2, (2017) 026023,arXiv:1608.07431 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2017

  55. [55]

    Continuum Naturalness

    C. Cs´ aki, G. Lee, S. J. Lee, S. Lombardo, and O. Telem, “Continuum Naturalness,”JHEP03 (2019) 142,arXiv:1811.06019 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2019

  56. [56]

    Gapped Continuum Kaluza-Klein spectrum,

    E. Meg´ ıas and M. Quir´ os, “Gapped Continuum Kaluza-Klein spectrum,”JHEP08(2019) 166, arXiv:1905.07364 [hep-ph]

    work page arXiv 2019

  57. [57]

    Analytical Green’s functions for continuum spectra,

    E. Megias and M. Quiros, “Analytical Green’s functions for continuum spectra,”JHEP09(2021) 157,arXiv:2106.09598 [hep-ph]

    work page arXiv 2021

  58. [58]

    Massive holographic QFTs in de Sitter,

    J. M. Pen´ ın, K. Skenderis, and B. Withers, “Massive holographic QFTs in de Sitter,”SciPost Phys.12no. 6, (2022) 182,arXiv:2112.14639 [hep-th]

    work page arXiv 2022

  59. [59]

    Confinement in de Sitter space and the swampland,

    R. K. Mishra, “Confinement in de Sitter space and the swampland,”JHEP01(2023) 002, arXiv:2207.12364 [hep-th]

    work page arXiv 2023

  60. [60]

    EPFL Lectures on Conformal Field Theory in D>= 3 Dimensions

    S. Rychkov,EPFL Lectures on Conformal Field Theory in D>= 3 Dimensions. SpringerBriefs in Physics. Springer Cham, 1, 2016.arXiv:1601.05000 [hep-th]

    work page internal anchor Pith review Pith/arXiv arXiv 2016

  61. [61]

    On the Phase Structure of Vector-Like Gauge Theories with Massless Fermions,

    T. Banks and A. Zaks, “On the Phase Structure of Vector-Like Gauge Theories with Massless Fermions,”Nucl. Phys. B196(1982) 189–204. 38

    work page 1982

  62. [62]

    Unparticle Physics

    H. Georgi, “Unparticle physics,”Phys. Rev. Lett.98(2007) 221601,arXiv:hep-ph/0703260

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  63. [63]

    Another Odd Thing About Unparticle Physics

    H. Georgi, “Another odd thing about unparticle physics,”Phys. Lett. B650(2007) 275–278, arXiv:0704.2457 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  64. [64]

    An Unparticle Example in 2D

    H. Georgi and Y. Kats, “An Unparticle Example in 2D,”Phys. Rev. Lett.101(2008) 131603, arXiv:0805.3953 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  65. [65]

    Unparticle self-interactions

    H. Georgi and Y. Kats, “Unparticle self-interactions,”JHEP02(2010) 065,arXiv:0904.1962 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2010

  66. [66]

    Comments on Unparticles

    B. Grinstein, K. A. Intriligator, and I. Z. Rothstein, “Comments on Unparticles,”Phys. Lett. B 662(2008) 367–374,arXiv:0801.1140 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  67. [67]

    Deconstruction of Unparticles

    M. A. Stephanov, “Deconstruction of Unparticles,”Phys. Rev. D76(2007) 035008, arXiv:0705.3049 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  68. [68]

    An Alternative to Compactification

    L. Randall and R. Sundrum, “An Alternative to compactification,”Phys. Rev. Lett.83(1999) 4690–4693,arXiv:hep-th/9906064

    work page internal anchor Pith review Pith/arXiv arXiv 1999

  69. [69]

    Echoes of a Hidden Valley at Hadron Colliders

    M. J. Strassler and K. M. Zurek, “Echoes of a hidden valley at hadron colliders,”Phys. Lett. B 651(2007) 374–379,arXiv:hep-ph/0604261

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  70. [70]

    The conformal window in QCD and supersymmetric QCD

    E. Gardi and G. Grunberg, “The Conformal window in QCD and supersymmetric QCD,”JHEP 03(1999) 024,arXiv:hep-th/9810192

    work page internal anchor Pith review Pith/arXiv arXiv 1999

  71. [71]

    Unparticle & Higgs as Composites

    F. Sannino and R. Zwicky, “Unparticle and Higgs as Composites,”Phys. Rev. D79(2009) 015016, arXiv:0810.2686 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2009

  72. [72]

    Missing Energy Signatures of Dark Matter at the LHC

    P. J. Fox, R. Harnik, J. Kopp, and Y. Tsai, “Missing Energy Signatures of Dark Matter at the LHC,”Phys. Rev. D85(2012) 056011,arXiv:1109.4398 [hep-ph]. [73]CMSCollaboration, V. Khachatryanet al., “Search for dark matter, extra dimensions, and unparticles in monojet events in proton–proton collisions at √s= 8 TeV,”Eur. Phys. J. C75 no. 5, (2015) 235,arXiv:...

    work page internal anchor Pith review Pith/arXiv arXiv 2012

  73. [73]

    Conformal Dynamics for TeV Physics and Cosmology

    F. Sannino, “Conformal Dynamics for TeV Physics and Cosmology,”Acta Phys. Polon. B40 (2009) 3533–3743,arXiv:0911.0931 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2009

  74. [74]

    Collider signals in unparticle physics

    K. Cheung, W.-Y. Keung, and T.-C. Yuan, “Collider signals of unparticle physics,”Phys. Rev. Lett.99(2007) 051803,arXiv:0704.2588 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  75. [75]

    Collider Phenomenology of Unparticle Physics

    K. Cheung, W.-Y. Keung, and T.-C. Yuan, “Collider Phenomenology of Unparticle Physics,” Phys. Rev. D76(2007) 055003,arXiv:0706.3155 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2007

  76. [76]

    Unparticle Dark Matter

    T. Kikuchi and N. Okada, “Unparticle Dark Matter,”Phys. Lett. B665(2008) 186–189, arXiv:0711.1506 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  77. [77]

    Unparticles and inflation

    H. Collins and R. Holman, “Unparticles and inflation,”Phys. Rev. D78(2008) 025023, arXiv:0802.4416 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv 2008

  78. [78]

    Unparticles: Interpretation and Cosmology

    J. McDonald, “Unparticles: Interpretation and Cosmology,”arXiv:0805.1888 [hep-ph]

    work page internal anchor Pith review Pith/arXiv arXiv

  79. [79]

    CFTs blueshift tensor fluctuations universally,

    M. Baumgart, J. J. Heckman, and L. Thomas, “CFTs blueshift tensor fluctuations universally,” JCAP07no. 07, (2022) 034,arXiv:2109.08166 [hep-ph]

    work page arXiv 2022

  80. [80]

    Equilateral Non-Gaussianity and New Physics on the Horizon

    D. Baumann and D. Green, “Equilateral Non-Gaussianity and New Physics on the Horizon,” JCAP09(2011) 014,arXiv:1102.5343 [hep-th]. [82]PlanckCollaboration, N. Aghanimet al., “Planck 2018 results. VI. Cosmological parameters,” Astron. Astrophys.641(2020) A6,arXiv:1807.06209 [astro-ph.CO]. [Erratum: Astron.Astrophys. 652, C4 (2021)]. 39

    work page internal anchor Pith review Pith/arXiv arXiv 2011

Showing first 80 references.