REVIEW 8 cited by
Massive Cosmologies
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
Signed reviews
read the original abstract
We explore the cosmological solutions of a recently proposed extension of General Relativity with a Lorentz-invariant mass term. We show that the same constraint that removes the Boulware-Deser ghost in this theory also prohibits the existence of homogeneous and isotropic cosmological solutions. Nevertheless, within domains of the size of inverse graviton mass we find approximately homogeneous and isotropic solutions that can well describe the past and present of the Universe. At energy densities above a certain crossover value, these solutions approximate the standard FRW evolution with great accuracy. As the Universe evolves and density drops below the crossover value the inhomogeneities become more and more pronounced. In the low density regime each domain of the size of the inverse graviton mass has essentially non-FRW cosmology. This scenario imposes an upper bound on the graviton mass, which we roughly estimate to be an order of magnitude below the present-day value of the Hubble parameter. The bound becomes especially restrictive if one utilizes an exact self-accelerated solution that this theory offers. Although the above are robust predictions of massive gravity with an explicit mass term, we point out that if the mass parameter emerges from some additional scalar field condensation, the constraint no longer forbids the homogeneous and isotropic cosmologies. In the latter case, there will exist an extra light scalar field at cosmological scales, which is screened by the Vainshtein mechanism at shorter distances.
Forward citations
Cited by 8 Pith papers
-
Infrared foundations for quantum geometry II: Catalogue of all torsion-like theories including new ghost-tachyon-free cases
A systematic catalogue of symmetric pair-antisymmetric rank-three field theories yields 22 ghost-tachyon-free models, all propagating vector torsion and none propagating scalar or pseudoscalar torsion.
-
Vector Perturbations in Ghost-Free Quasidilaton Massive Gravity
Minimal scalar, Maxwell, or Proca matter does not restore the vanishing vector kinetic coefficient K_V on Branch II of ghost-free quasidilaton massive gravity.
-
New Energy-Loss Constraints on Dark Sectors from Deeply Inelastic Scattering with Initial State Radiation
A factorization-based method is outlined to derive energy-loss constraints on dark sector particles (spin 0 to 2) from ISR-modified lepton distributions in DIS, illustrated for MeV-GeV spin-0 cases at the EIC.
-
Stable Cosmology from Minimal Theory of Mass-Varying Massive Gravity
MTMVMG is claimed to admit stable FLRW perturbations, with the mass-varying scalar as dark energy or inflaton, but stability inequalities are unverified and the phenomenology is fitted.
-
Complete background cosmology of parity-even quadratic metric-affine gravity
The full background dynamics of parity-even quadratic metric-affine gravity in FLRW spacetimes are derived, including branches with spatial-curvature screening and analytic de Sitter-like solutions.
-
To the Problem of Cosmic Expansion in Massive Gravity
All flat expanding cosmologies in dRGT massive gravity are strongly coupled at the perturbation level, so they cannot serve as healthy backgrounds for cosmic acceleration.
-
Do Pulsar Timing Datasets Favor Massive Gravity?
A one-parameter massive-gravity correlation curve gives lower chi-square than the Hellings-Downs curve for current pulsar-timing data, but the parameter is fitted to the data, so the result is not a prediction.
-
An overview of quasinormal modes in modified and extended gravity
Using a uniform sixth-order WKB method, the authors map how quasinormal mode frequencies and damping rates shift from general relativity in five modified gravity models, finding model-specific patterns.
Discussion (0). Continue with ORCID to comment.