Gravitational lensing in Weyl gravity

Kasikci, Oguzhan; Deliduman, Cemsinan

doi:10.1103/physrevd.100.024019

Cited by 18 publications

(15 citation statements)

References 96 publications

(251 reference statements)

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“…The astrophysical relevance of this solution was further confirmed in a number of works [28][29][30]. This black hole solution [24] has been recently studied in a number of papers, with the emphasis to lensing and particle motion [31][32][33][34][35][36][37], thermodynamics [38,39] and quasinormal modes [40][41][42][43].…”

Section: Introductionmentioning

confidence: 69%

Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Konoplya

2020

Preprint

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Section: Introductionmentioning

confidence: 69%

Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Konoplya

2020

Preprint

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“…[100,101] also address observed galaxy cluster motion with no dark matter. Furthermore, if CG is to account for all dark matter in the Universe, it is so far unclear if it can pass gravitational lensing tests [102][103][104][105][106][107][108], and inconsistencies with gravitational wave observation of binaries have been found [109]. Also, tensions between predictions of primordial nucleosynthesis in a CG cosmology and observation of light element abundances have been found in refs.…”

Section: Conformal Gravity Cosmologymentioning

confidence: 99%

Probing alternative cosmologies through the inverse distance ladder

Lindner

Max²,

Platscher

et al. 2020

J. Cosmol. Astropart. Phys.

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We study the implications of a combined analysis of cosmic standard candles and standard rulers on the viability of cosmological models beyond the cosmological concordance model ΛCDM. To this end, we employ well-established data in the form of the joint lightcurve analysis supernova compilation, baryon acoustic oscillations, and cosmic microwave background data on the one hand, and a recently proposed set of quasars as objects of known brightness on the other hand. The advantage of including the latter is that they extend the local distance measures to redshifts which have previously been out of reach and we investigate how this allows one to test cosmologies beyond ΛCDM. While there exist various studies on parametric extensions of ΛCDM, we present here a comparative study of both parametric and fundamental extensions of the standard cosmology. In order to keep the scope of this manuscript contained, we focus on two particular modifications: one is the consistent theory of two interacting spin-2 objects, so-called bigravity, and the other conformal gravity, a theory of gravity that has no knowledge of fundamental length scales. The former of the two constitutes a veritable extension of General Relativity, given that it adds to the metric tensor of gravity a second dynamical tensor field. The resulting dynamics have been proposed as a self-accelerating cosmology. Conformal gravity on the other hand is a much more drastic change of the underlying gravitational theory. Its ignorance towards fundamental length scales offers a completely different approach to the origin of late time acceleration. In this sense, both models offer -in one way or another --an explanation for the dark energy problem. We perform a combined cosmological fit which provides strong constraints on these extensions. We also briefly comment on the implications of the longstanding H 0 -tension.

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“…Since conformal Weyl gravity has been revisited by Mannheim and Kazansas (1989) [5], several authors in recent times have obtained expressions for deflection of light and performed lensing analysis in conformal gravity in Mannheim-Kazansas space-times (e.g., [22][23][24][25][26][27][28][29]), particularly in the context of weak lensing scenario. But the bending angle expressions given by the different authors are found different and non-convergent.…”

Section: Introductionmentioning

confidence: 99%

Test of conformal theory of gravity as an alternative paradigm to dark matter hypothesis from gravitational lensing studies

Ghosh,

Bhattacharya,

Sherpa

et al. 2023

J. Cosmol. Astropart. Phys.

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Weyl's conformal gravity theory, which is considered as a compelling alternative to general relativity theory, has been claimed to describe the observed flat rotation curve feature of spiral galaxies without the need of invoking dark matter. However, it is important to examine whether the Weyl theory can also explain the relevant gravitational lensing observations correctly without considering any dark matter. In this regard, the gravitational bending angle in static spherically space-time (Mannheim-Kazanas metric) in Weyl theory has been calculated by several authors over the last two decades, but the results are found largely divergent. In this work, we have revisited the problem and obtain the correct and consistent expression of the deflection angle in conformal gravity. Subsequently we perform the gravitational lensing analysis. We compare the prediction of Weyl gravity with the gravitational lensing observations of the rich galaxy clusters Abell 370 and Abell 2390 and is found that Weyl theory cannot describe the stated lensing observations without considering dark matter.

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Gravitational lensing in Weyl gravity

Cited by 18 publications

References 96 publications

Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Conformal Weyl gravity via two stages of quasinormal ringing and late-time behavior

Probing alternative cosmologies through the inverse distance ladder

Test of conformal theory of gravity as an alternative paradigm to dark matter hypothesis from gravitational lensing studies

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