REVIEW 5 cited by
Beyond the Hellings-Downs curve: Non-Einsteinian gravitational waves in pulsar timing array correlations
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
abstract
The recent astronomical milestone by the pulsar timing arrays (PTA) has revealed galactic-size gravitational waves (GW) in the form of a stochastic gravitational wave background (SGWB), correlating the radio pulses emitted by millisecond pulsars. This draws the outstanding questions toward the origin and the nature of the SGWB; the latter is synonymous to testing how quadrupolar the inter-pulsar spatial correlation is. In this paper, we tackle the nature of the SGWB by considering correlations beyond the Hellings-Downs (HD) curve of Einstein's general relativity. We put the HD and non-Einsteinian GW correlations under scrutiny with the NANOGrav and the CPTA data, and find that both data sets allow a graviton mass $m_{\rm g} \lesssim 1.04 \times 10^{-22} \ {\rm eV}/c^2$ and subluminal traveling waves. We discuss gravitational physics scenarios beyond general relativity that could host non-Einsteinian GW correlations in the SGWB and highlight the importance of the cosmic variance inherited from the stochasticity in interpreting PTA observation.
Forward citations
Cited by 5 Pith papers
-
Testing General Relativity with Individual Supermassive Black Hole Binaries
Beyond-GR polarization modes in a single supermassive black hole binary show up linearly (not quadratically) in pulsar-timing cross-correlations, massive-graviton dispersion shifts antenna patterns and pulsar-term pha...
-
New test of modified gravity with gravitational wave experiments
For a stationary, isotropic gravitational wave background, three-point correlations are produced only by scalar polarizations, giving a new null test for modified gravity.
-
Probing Graviton Mass with MeerKAT PTA and SKA--PTA Forecasts
MPTA 4.5-year data imply a 90% upper bound of mg < 2.1 × 10−23 eV/c2, consistent with massless gravitons; SKA-PTA could reach ~10−25 eV/c2.
-
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.
-
Searching beyond the fiducial stochastic gravitational wave background in pulsar timing array data using likelihood reweighting
A two-stage likelihood reweighting method recovers the parameters and Bayes factor of an added sinusoid signal in simulated pulsar timing data, matching full Bayesian analyses while claiming about a tenfold speedup.
Discussion (0). Continue with ORCID to comment.