A simple parity violating model in the symmetric teleparallel gravity and its cosmological perturbations

Li, Mingzhe; Zhao, Dehao

doi:10.1016/j.physletb.2022.136968

Cited by 31 publications

(22 citation statements)

References 24 publications

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“…Alternatively, if we start from Teleparallel Equivalent of General Relativity (TEGR) [33][34][35][36], we will obtain a family of torsion-based modified gravity [37,38]. These torsional gravities provide new possible mechanisms for cosmological observations, such as inflation and accelerated expansion, and are highly considered and widely studied [39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55]. It is worth noting that these modifications are efficient under confrontation with galaxy-scale observations too [56,57].…”

Section: Introductionmentioning

confidence: 99%

Gaussian processes and effective field theory of $f(T)$ gravity under the $H_0$ tension

Ren,

Yan,

Zhao

et al. 2022

Preprint

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We consider the effective field theory formulation of torsional gravity in a cosmological framework to alter the background evolution. Then we use the latest H0 measurement from the SH0ES Team as well as observational Hubble data from cosmic chronometer (CC) and radial baryon acoustic oscillations (BAO) and we reconstruct the f (T ) form in a model-independent way by applying Gaussian processes. Since the special square-root term does not affect the evolution at the background level, we finally result to a family of functions that can produce the background evolution required by the data. Finally, performing a fitting using polynomial functions we find an analytic expression that may describe the cosmological evolution in great agreement with observations.

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Section: Introductionmentioning

confidence: 99%

Gaussian processes and effective field theory of $f(T)$ gravity under the $H_0$ tension

Ren,

Yan,

Zhao

et al. 2022

Preprint

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“…As was pointed out in Ref. [27] this parity violating extension promotes the vector perturbations to dynamical degrees of freedom and also causes velocity and amplitude birefringence phenomena in the vector modes, and more importantly one of the vector modes becomes ghost at high momentum scales. It seems that the amplitude birefringence is always accompanied by the ghost instability.…”

Section: Introductionmentioning

confidence: 77%

“…However, as pointed out in Ref. [27], with this modification, the vector perturbations in the gravity sector are promoted to be propagating dynamical modes, and one of the vector modes becomes a ghost at high momentum scales. Now we turn to the more general (and of course more complex) case where parity violating extensions in gravity are provided by several interactions between the scalar field and the parity-odd terms which are quadratic in the nonmetricity tensor.…”

Section: The Symmetric Teleparallel Gravity Model With Parity Violationsmentioning

confidence: 91%

“…The model studied in Ref. [27] is very similar to a special case with c 2 = c 3 = ... = c 7 = 0. This more general model was considered in [26], where only the tensor modes of the linear cosmological perturbation were considered.…”

Section: The Symmetric Teleparallel Gravity Model With Parity Violationsmentioning

confidence: 98%

“…This modification indeed produces velocity birefringence phenomenon in the cosmological tensor perturbations [26], but it was found in Ref. [27] that it suffers from severe theoretical problems when cosmological vector perturbations are considered. As was pointed out in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Possible consistent model of parity violations in the symmetric teleparallel gravity

Li,

Tong,

Zhao

2022

Preprint

Self Cite

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Many parity violating gravity models suffer from the ghost instability problem. In this paper we consider a symmetric teleparallel gravity model which extends the general relativity equivalent model by several parity violating interactions between the gravitational field and a scalar field. These interactions exclude higher derivatives and are quadratic in the non-metricity tensor. Through investigations on the linear cosmological perturbations, our results show that in general this model suffers from the difficulty caused by the existence of ghost mode in the vector perturbations. However, in cases where a special condition is imposed on the coefficients of these parity violating interactions, this model can be ghost free.

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Maxwell‐f(Q)$f(Q)$ Theory

Nashed

2024

Fortschritte der Physik

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Exploring the four‐dimensional AdS black hole is crucial within the framework of the AdS/CFT correspondence. In this research, four‐dimensional stationary and rotating AdS solutions in the framework of the gravitational theory are investigated, considering the charged scenario. Author's emphasis is on the power‐law ansatz, which consistent with observations and is deemed the most viable. Because this solution does not have an uncharged version or relate to general relativity, it falls into a new category, which derives its features from changes in non‐metricity and incorporates the Maxwell domain. The singularities of such a solution are analyzed, computing all the quantities of different curvature and non‐metricity invariants. Author's results indicate the presence of a central singularity, albeit with a softer nature compared to standard non‐metricity or Einstein general relativity, attributed to the influence of the effect of . Several physical characteristics of black hole from thermodynamics perspective and demonstrate the existence of an outer event horizon in addition to the inner Cauchy horizons are examined. However, under the conditions of sufficiently large electric charge, a naked singularity emerges. Finally, a class of rotating black hole in four‐dimensional gravity that are asymptotically anti‐de Sitter charged is derived.

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A simple parity violating model in the symmetric teleparallel gravity and its cosmological perturbations

Cited by 31 publications

References 24 publications

Gaussian processes and effective field theory of $f(T)$ gravity under the $H_0$ tension

Gaussian processes and effective field theory of $f(T)$ gravity under the $H_0$ tension

Possible consistent model of parity violations in the symmetric teleparallel gravity

Maxwell‐f(Q)$f(Q)$ Theory

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