Testing parity symmetry of gravity with gravitational waves

Qiao, Jin; Zhao, Li; Zhu, Tao; Ji, Ran; Li, Guoliang; Zhao, Wen

doi:10.3389/fspas.2022.1109086

Cited by 21 publications

(10 citation statements)

References 86 publications

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“…Current and future GW observations can constrain these gravitational theories with high accuracy [43][44][45][46][47][48][49][50][51][52]. Some kinds of modified theories, including parity-violating effects, have been studied in recent years [53][54][55][56][57][58][59][60][61][62][63][64][65][66], like Chern-Simons (CS) gravity [26,67] (consisting of dynamical and non-dynamical cases), ghost-free parity-violating theory [68][69][70][71][72], Nieh-Yan modified teleparallel gravity [73,74], parity-violating symmetric teleparallel gravities [75] and the general spatial covariant gravities [31,32,60,61,63,[76][77][78]]. As a typical example, CS theory introduces a coupling term between the pseudo-scalar and Pontryagin density in the Einstein-Hilbert action, which causes the nonconservation of the CS topological current.…”

Section: Jcap04(2023)006 1 Introductionmentioning

confidence: 99%

Gravitational waveform and polarization from binary black hole inspiral in dynamical Chern-Simons gravity: from generation to propagation

Zhao

Qiao

Liu

et al. 2023

J. Cosmol. Astropart. Phys.

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We calculate the gravitational waveform radiated from spinning black holes (BHs) binary in dynamical Chern-Simons (dCS) gravity. The equation of motion (EOM) of the spinning binary BHs is derived based on the modified Mathisson-Papapetrou-Dixon equation for the spin-aligned circular orbits. The leading-order effects induced by the dCS theory contain spin-spin interaction and monopole-quadrupole interaction, which influences both the EOM of the binary system and corresponding gravitational waveform at the second post-Newtonian (PN) order (i.e., 2PN order). After reporting the waveforms, we investigate the polarization modes of gravitational waves (GWs) in dCS theory. None of the extra modes appears in this theory up to the considered PN order. Moreover, since the time scale of the binary merger is much smaller than that of the cosmological expansion, the parity-violating effect of the dCS theory does not appear in the process of GW generation. However, during the process of GW propagation, amplitude birefringence, a typical parity-violating effect, makes plus and cross modes convert to each other, which modifies the gravitational waveform at 1.5PN order.

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Section: Jcap04(2023)006 1 Introductionmentioning

confidence: 99%

Gravitational waveform and polarization from binary black hole inspiral in dynamical Chern-Simons gravity: from generation to propagation

Zhao

Qiao

Liu

et al. 2023

J. Cosmol. Astropart. Phys.

Self Cite

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“…Cosmological models, such as those described in refs. [57][58][59][60][61], can generate chirality through parity-violating interactions. A finite sum of nearby SMBHBs can also produce a random fraction of chirality [62][63][64].…”

Section: Power-law Stochastic Gravitational Wave Backgroundmentioning

confidence: 99%

Dissecting the stochastic gravitational wave background with astrometry

Çalışkan,

Chen,

Dai

et al. 2024

J. Cosmol. Astropart. Phys.

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Astrometry, the precise measurement of star motions, offers an alternative avenue to investigate low-frequency gravitational waves through the spatial deflection of photons, complementing pulsar timing arrays reliant on timing residuals. Upcoming data from Gaia, Theia, and Roman can not only cross-check pulsar timing array findings but also explore the uncharted frequency range bridging pulsar timing arrays and LISA. We present an analytical framework to evaluate the feasibility of detecting a gravitational wave background, considering measurement noise and the intrinsic variability of the stochastic background. Furthermore, we highlight astrometry's crucial role in uncovering key properties of the gravitational wave background, such as spectral index and chirality, employing information-matrix analysis. Finally, we simulate the emergence of quadrupolar correlations, commonly referred to as the generalized Hellings-Downs curves.

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“…Other recent studies on parity violating gravities can be found in Refs. [22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Irregular universe in the Nieh-Yan modified teleparallel gravity

Li¹,

Rao²

2023

Preprint

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The Nieh-Yan modified teleparallel gravity is a model which modifies the general relativity equivalent teleparallel gravity by a coupling between the Nieh-Yan density and an axion-like field. This model predicts parity violations in the gravitational waves if the axion-like field has a non-trivial background, and more importantly it is ghost free and avoids the pathologies presented in other parity-violating gravity models. The cosmological dynamics and perturbations of the Nieh-Yan modified teleparallel gravity have been investigated in detail, but all these previous investigations rely on the symmetry requirement that in the background universe both the metric and affine connection are homogeneous and isotropic. In this paper we relax the symmetry constraint on the connection and leave it arbitrary at the beginning, after all the cosmological principle only needs the metric of the background spacetime to meet the symmetry requirement. We find a new flat universe solution for the Nieh-Yan modified teleparallel gravity, for which the background dynamics itself is unchanged but the perturbations around it present a new feature that the scalar and tensor perturbations are coupled together at the linear level. The implications of this peculiar feature in primordial perturbations from inflation are also discussed.

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Testing parity symmetry of gravity with gravitational waves

Cited by 21 publications

References 86 publications

Gravitational waveform and polarization from binary black hole inspiral in dynamical Chern-Simons gravity: from generation to propagation

Gravitational waveform and polarization from binary black hole inspiral in dynamical Chern-Simons gravity: from generation to propagation

Dissecting the stochastic gravitational wave background with astrometry

Irregular universe in the Nieh-Yan modified teleparallel gravity

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