English

# Item

ITEM ACTIONSEXPORT
Testing GR with the Gravitational Wave Inspiral Signal GW170817

Shoom, A., Gupta, P. K., Krishnan, B., Nielsen, A. B., & Capano, C. (in preparation). Testing GR with the Gravitational Wave Inspiral Signal GW170817.

Item is

show hide
Genre: Paper

### Files

show Files
hide Files
:
2105.02191.pdf (Preprint), 15MB
Name:
2105.02191.pdf
Description:
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
-
-

show

### Creators

show
hide
Creators:
Shoom, Andrey1, Author
Gupta, Pawan K., Author
Nielsen, Alex B.1, Author
Capano, Collin1, Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

### Content

show
hide
Free keywords: General Relativity and Quantum Cosmology, gr-qc
Abstract: Observations of gravitational waves from compact binary mergers have enabled unique tests of general relativity in the dynamical and non-linear regimes. One of the most important such tests are constraints on the post-Newtonian (PN) corrections to the phase of the gravitational wave signal. The values of these PN coefficients can be calculated within standard general relativity, and these values are different in many alternate theories of gravity. It is clearly of great interest to constrain these deviations based on gravitational wave observations. In the majority of such tests which have been carried out, and which yield by far the most stringent constraints, it is common to vary these PN coefficients individually. While this might in principle be useful for detecting certain deviations from standard general relativity, it is a serious limitation. For example, we would expect alternate theories of gravity to generically have additional parameters. The corrections to the PN coefficients would be expected to depend on these additional non-GR parameters whence, we expect that the various PN coefficients to be highly correlated. We present an alternate analysis here using data from the binary neutron star coalescence GW170817. Our analysis uses an appropriate linear combination of non-GR parameters that represent absolute deviations from the corresponding post-Newtonian inspiral coefficients in the TaylorF2 approximant phase. These combinations represent uncorrelated non-GR parameters which correspond to principal directions of their covariance matrix in the parameter subspace. Our results illustrate good agreement with GR. In particular, the integral non-GR phase is $\Psi_{\mbox{non-GR}} = (0.447\pm253)\times10^{-1}$ and the deviation from GR percentile is $p^{\mbox{Dev-GR}}_{n}=25.85\%$.

### Details

show
hide
Language(s):
Dates: 2021-05-05
Publication Status: Not specified
Pages: 10 pages, 4 figures
Publishing info: -
Rev. Type: -
Identifiers: arXiv: 2105.02191
Degree: -

show

show

show

show