Parity-violating gravity and GW170817 in non-Riemannian cosmology

Conroy, Aindriú; Koivisto, Tomi S.

doi:10.1088/1475-7516/2019/12/016

Cited by 60 publications

(46 citation statements)

References 52 publications

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“…We will not pursue these extensions further in this article, and leave their investigation for future work. We also remark that a different class of scalar field couplings to more general parity-odd invariants, which also include higher-order derivatives, were studied in [59].…”

Section: Symmetric Teleparallel Axionsmentioning

confidence: 99%

Teleparallel axions and cosmology

Hohmann

Pfeifer

2021

Eur. Phys. J. C

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We consider the most general teleparallel theory of gravity whose action is a linear combination of the five scalar invariants which are quadratic in the torsion tensor. Since two of these invariants possess odd parity, they naturally allow for a coupling to pseudo-scalar fields, thus yielding a Lagrangian which is even under parity transformations. In analogy to similar fields in gauge theories, we call these pseudo-scalar fields teleparallel axions. For the most general coupling of a single axion field, we derive the cosmological field equations. We find that for a family of cosmologically symmetric teleparallel geometries, which possess non-vanishing axial torsion, the axion coupling contributes to the cosmological dynamics in the early universe. Most remarkably, this contribution is also present when the axion is coupled to the teleparallel equivalent of general relativity, hence allowing for a canonical coupling of a pseudo-scalar to general relativity. For this case we schematically present the influence of the axion coupling on the fixed points in the cosmological dynamics understood as dynamical system. Finally, we display possible generalizations and similar extensions in other geometric frameworks to model gravity.

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Section: Symmetric Teleparallel Axionsmentioning

confidence: 99%

Teleparallel axions and cosmology

Hohmann

Pfeifer

2021

Eur. Phys. J. C

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“…In these four parameters, µ A and μ determine the speed of GWs, while ν A and ν determine the damping rate of GWs during their propagation. As shown in [54], such parametrization provides an unifying description for the low-energy effective description of GWs in generic modified gravities, including Chern-Simons modified gravity [40], ghost-free parity violating scalar-tensor theory [31,39,44], symmetric teleparallel equivalence of general relativity [49], Hořava-Lifshitz gravities [17][18][19][20][21][22], the Nieh-Yan modified teleparallel gravity [50,51].…”

Section: A Gws In Parity and Lorentz Violating Gravitiesmentioning

confidence: 98%

“…Various implications of parity violations on the gravitational waves have been extensively explored in [40][41][42][43][44][45][46][47][48]. Note that in [49][50][51][52], a parity-violating effects induced by lower dimemnsion operators have also been proposed and their phenomenological effects have been explored.…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave constraints on Lorentz and parity violations in gravity: high-order spatial derivative cases

Gong,

Zhu,

Niu

et al. 2021

Preprint

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High-order spatial derivatives are of crucial importance for constructing the low energy effective action of a Lorentz or parity violating theory of quantum gravity. One example is the Hořava-Lifshitz gravity, in one has to consider at least the sixth-order spatial derivatives in the gravitational action, in order to make the theory power-counting renormalizable. In this paper, we consider the Lorentz and parity violating effects on the propagation of GWs due to the fifth and sixth-order spatial derivatives respectively. For this purpose we calculate the corresponding Lorentz and parity violating waveforms of GWs produced by the coalescence of compact binaries. By using these modified waveforms, we perform the full Bayesian inference with the help of the open source software Bilby on the selected GW events of binary black hole (BBH) and binary neutron stars (BNS) merges in the LIGO-Virgo catalogs GWTC-1 and GWTC-2. Overall we do not find any significant evidence of Lorentz and parity violation due to the fifth and sixth-order spatial derivatives and thus place lower bounds on the energy scales MLV > 2.4 × 10 −16 GeV for Lorentz violation and MPV > 1.0 × 10 −14 GeV for parity violation at 90% confidence level. Both constraints represent the first constraints on the fifthand sixth-order spatial derivative terms respectively in the framework of spatial covariant gravity by using the observational data of GWs.

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“…It deserves mentioning that there is also consideration on PV gravity model [24] based on the symmetric teleparallel gravity [25]. However, as it was pointed out in Ref.…”

Section: Introductionmentioning

confidence: 99%

Ghost instability in the teleparallel gravity model with parity violations

Li,

Rao

2022

Preprint

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In this paper we consider the parity violating gravity model within the framework of teleparallel gravity. The parity violations are caused by the couplings of a scalar field to the scalar invariants which are parity-odd and quadratic in the torsion tensor. Totally there are two such type independent invariants, and one of them is the Nieh-Yan density. Through investigations on the cosmological perturbations of this model, we find that in general it suffers from the difficulties of ghost instability in the scalar and vector perturbations. But in the special case only the coupling to the Nieh-Yan density exists, this model is ghost free and reduces to the Nieh-Yan modified Teleparallel Gravity model.

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Parity-violating gravity and GW170817 in non-Riemannian cosmology

Cited by 60 publications

References 52 publications

Teleparallel axions and cosmology

Teleparallel axions and cosmology

Gravitational wave constraints on Lorentz and parity violations in gravity: high-order spatial derivative cases

Ghost instability in the teleparallel gravity model with parity violations

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