2021ApJ...923L..22A

Query : 2021ApJ...923L..22A

2021ApJ...923L..22A - Astrophys. J., 923, L22-L22 (2021/December-3)

The NANOGrav 12.5-year data set: search for non-einsteinian polarization modes in the gravitational-wave background.

ARZOUMANIAN Z., BAKER P.T., BLUMER H., BECSY B., BRAZIER A., BROOK P.R., BURKE-SPOLAOR S., CHARISI M., CHATTERJEE S., CHEN S., CORDES J.M., CORNISH N.J., CRAWFORD F., CROMARTIE H.T., DECESAR M.E., DEGAN D.M., DEMOREST P.B., DOLCH T., DRACHLER B., ELLIS J.A., FERRARA E.C., FIORE W., FONSECA E., GARVER-DANIELS N., GENTILE P.A., GOOD D.C., HAZBOUN J.S., HOLGADO A.M., ISLO K., JENNINGS R.J., JONES M.L., KAISER A.R., KAPLAN D.L., KELLEY L.Z., KEY J.S., LAAL N., LAM M.T., LAZIO T.J.W., LORIMER D.R., LIU T., LUO J., LYNCH R.S., MADISON D.R., McEWEN A., McLAUGHLIN M.A., MINGARELLI C.M.F., NG C., NICE D.J., OLUM K.D., PENNUCCI T.T., POL N.S., RANSOM S.M., RAY P.S., ROMANO J.D., SARDESAI S.C., SHAPIRO-ALBERT B.J., SIEMENS X., SIMON J., SIWEK M.S., SPIEWAK R., STAIRS I.H., STINEBRING D.R., STOVALL K., SUN J.P., SWIGGUM J.K., TAYLOR S.R., TURNER J.E., VALLISNERI M., VIGELAND S.J., WAHL H.M., WITT C.A. (The NANOGrav Collaboration)

Abstract (from CDS):

We search NANOGrav's 12.5 yr data set for evidence of a gravitational-wave background (GWB) with all the spatial correlations allowed by general metric theories of gravity. We find no substantial evidence in favor of the existence of such correlations in our data. We find that scalar-transverse (ST) correlations yield signal-to-noise ratios and Bayes factors that are higher than quadrupolar (tensor-transverse, TT) correlations. Specifically, we find ST correlations with a signal-to-noise ratio of 2.8 that are preferred over TT correlations (Hellings and Downs correlations) with Bayesian odds of about 20:1. However, the significance of ST correlations is reduced dramatically when we include modeling of the solar system ephemeris systematics and/or remove pulsar J0030+0451 entirely from consideration. Even taking the nominal signal-to-noise ratios at face value, analyses of simulated data sets show that such values are not extremely unlikely to be observed in cases where only the usual TT modes are present in the GWB. In the absence of a detection of any polarization mode of gravity, we place upper limits on their amplitudes for a spectral index of γ = 5 and a reference frequency of fyr = 1 yr–1. Among the upper limits for eight general families of metric theories of gravity, we find the values of ATT^95 % ^=(9.7±0.4)×10–16 and AST^95 % ^=(1.4±0.03)×10–15 for the family of metric spacetime theories that contain both TT and ST modes.

Abstract Copyright: © 2021. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational waves - Pulsars - General relativity - Non-standard theories of gravity - Pulsar timing method

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR J0030+0451 Psr 00 30 27.42348 +04 51 39.7144           ~ 596 1
2 PSR J1600-3053 Psr 16 00 51.902514 -30 53 49.45343           ~ 218 0
3 PSR J1640+2224 Psr 16 40 16.744850 +22 24 08.84119           ~ 210 0
4 PSR J1713+0747 Psr 17 13 49.5367813 +07 47 37.450240           ~ 530 1
5 PSR J1744-1134 Psr 17 44 29.4220844 -11 34 54.801320           ~ 323 1
6 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 343 2
7 PSR J1910+1256 Psr 19 10 09.701454 +12 56 25.48680           ~ 108 1
8 PSR J1918-0642 Psr 19 18 48.027685 -06 42 34.95735           ~ 146 0
9 PSR J2043+1711 Psr 20 43 20.8828 +17 11 28.941           ~ 129 1
10 PSR B2145-07.8 Psr 21 45 50.45590 -07 50 18.5900           ~ 336 0
11 PSR J2317+1439 Psr 23 17 09.235606 +14 39 31.29559           ~ 211 1

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