REVIEW 4 cited by
Challenges to Self-Acceleration in Modified Gravity from Gravitational Waves and Large-Scale Structure
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
With the advent of gravitational-wave astronomy marked by the aLIGO GW150914 and GW151226 observations, a measurement of the cosmological speed of gravity will likely soon be realized. We show that a confirmation of equality to the speed of light as indicated by indirect Galactic observations will have important consequences for a very large class of alternative explanations of the late-time accelerated expansion of our Universe. It will break the dark degeneracy of self-accelerated Horndeski scalar-tensor theories in the large-scale structure that currently limits a rigorous discrimination between acceleration from modified gravity and from a cosmological constant or dark energy. Signatures of a self-acceleration must then manifest in the linear, unscreened cosmological structure. We describe the minimal modification required for self-acceleration with standard gravitational-wave speed and show that its maximum likelihood yields a 3-sigma poorer fit to cosmological observations compared to a cosmological constant. Hence, equality between the speeds challenges the concept of cosmic acceleration from a genuine scalar-tensor modification of gravity.
Forward citations
Cited by 4 Pith papers
-
Multi-messenger tests of gravity with weakly lensed gravitational waves
The authors show that cross-correlating GW source convergence with CMB lensing can measure a GR prediction (identical geodesics for GWs and photons) at high SNR for LISA-class detectors.
-
Modelling the matter bispectrum at small scales in modified gravity
No existing matter-bispectrum model is accurate enough for Stage IV lensing surveys across the tested modified gravity theories, and a halo-model-corrected fitting formula is the most accurate option tested.
-
Cosmological searches for the neutrino mass scale and mass ordering
Thesis summarizing an upper limit of 0.12 eV on the neutrino mass sum, bias calibration via CMB lensing cross-correlations, and tighter limits plus stronger normal-ordering preference in non-phantom dynamical dark ene...
-
Parametrizations for tests of gravity
A review of parametrized frameworks (PPF, EFT, PPN, ppE) for testing gravity across cosmological and astrophysical scales, with an outlook toward unification.
Discussion (0). Continue with ORCID to comment.