Symmetries play a fundamental role in modern theories of gravity. The strong equivalence principle (SEP) constitutes a collection of gravitational symmetries which are all implemented by general relativity. Alternative theories, however, are generally expected to violate some aspects of SEP. We test three aspects of SEP using observed change rates in the orbital period and eccentricity of binary pulsar J1713+0747: (1) the gravitational constant’s constancy as part of locational invariance of gravitation; (2) the universality of free fall (UFF) for strongly self-gravitating bodies; (3) the post-Newtonian parameter α 3 in gravitational Lorentz invariance. Based on the pulsar timing result of the combined data set from the North American Nanohertz Gravitational Observatory and the European Pulsar Timing Array, we find G/G = (−0.1 ± 0.9) × 10−12 yr−1, which is weaker than Solar system limits, but applies for strongly self-gravitating objects. Furthermore, we obtain an improved test for a UFF violation by a strongly self-gravitating mass falling in the gravitational field of our Galaxy, with a limit of || < 0.002 (95 per cent C.L.). Finally, we derive an improved limit on the self-acceleration of a gravitationally bound rotating body, to a preferred reference frame in the Universe, with −3 × 10−20 < α 3 < 4 × 10−20 (95 per cent C.L.). These results are based on direct UFF and α 3 tests using pulsar binaries, and they overcome various limitations of previous tests of this kind.

Zhu, W., Desvignes, G., Wex, N., Caballero, R., Champion, D., Demorest, P., et al. (2019). Tests of gravitational symmetries with pulsar binary J1713+0747. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 482(3), 3249-3260 [10.1093/mnras/sty2905].

Tests of gravitational symmetries with pulsar binary J1713+0747

Shaifullah, G.;
2019

Abstract

Symmetries play a fundamental role in modern theories of gravity. The strong equivalence principle (SEP) constitutes a collection of gravitational symmetries which are all implemented by general relativity. Alternative theories, however, are generally expected to violate some aspects of SEP. We test three aspects of SEP using observed change rates in the orbital period and eccentricity of binary pulsar J1713+0747: (1) the gravitational constant’s constancy as part of locational invariance of gravitation; (2) the universality of free fall (UFF) for strongly self-gravitating bodies; (3) the post-Newtonian parameter α 3 in gravitational Lorentz invariance. Based on the pulsar timing result of the combined data set from the North American Nanohertz Gravitational Observatory and the European Pulsar Timing Array, we find G/G = (−0.1 ± 0.9) × 10−12 yr−1, which is weaker than Solar system limits, but applies for strongly self-gravitating objects. Furthermore, we obtain an improved test for a UFF violation by a strongly self-gravitating mass falling in the gravitational field of our Galaxy, with a limit of || < 0.002 (95 per cent C.L.). Finally, we derive an improved limit on the self-acceleration of a gravitationally bound rotating body, to a preferred reference frame in the Universe, with −3 × 10−20 < α 3 < 4 × 10−20 (95 per cent C.L.). These results are based on direct UFF and α 3 tests using pulsar binaries, and they overcome various limitations of previous tests of this kind.
Articolo in rivista - Articolo scientifico
Binaries: general; Gravitation; Pulsars: individual (PSR J1713+0747); Stars: neutron;
English
3249
3260
12
Zhu, W., Desvignes, G., Wex, N., Caballero, R., Champion, D., Demorest, P., et al. (2019). Tests of gravitational symmetries with pulsar binary J1713+0747. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 482(3), 3249-3260 [10.1093/mnras/sty2905].
Zhu, W; Desvignes, G; Wex, N; Caballero, R; Champion, D; Demorest, P; Ellis, J; Janssen, G; Kramer, M; Krieger, A; Lentati, L; Nice, D; Ransom, S; Stairs, I; Stappers, B; Verbiest, J; Arzoumanian, Z; Bassa, C; Burgay, M; Cognard, I; Crowter, K; Dolch, T; Ferdman, R; Fonseca, E; Gonzalez, M; Graikou, E; Guillemot, L; Hessels, J; Jessner, A; Jones, G; Jones, M; Jordan, C; Karuppusamy, R; Lam, M; Lazaridis, K; Lazarus, P; Lee, K; Levin, L; Liu, K; Lyne, A; Mckee, J; Mclaughlin, M; Osłowski, S; Pennucci, T; Perrodin, D; Possenti, A; Sanidas, S; Shaifullah, G; Smits, R; Stovall, K; Swiggum, J; Theureau, G; Tiburzi, C
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/363407
Citazioni
  • Scopus 52
  • ???jsp.display-item.citation.isi??? 52
Social impact