Search for variability in Newton’s constant using local gravitational acceleration measurements

Bhagvati, Srinikitha; Desai, S.

doi:10.1088/1361-6382/ac3c8c

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Such a magnitude of transition in G is in accord with the model in Marra and Perivolaropoulos (2021) designed to resolve the Hubble conundrum. However, the observed variation is at odds with the bounds on variation of G (Zyla et al 2020;Bhagvati and Desai 2022). Note however that the best-fit BTFR parameters are still consistent between the two subsamples (See Table 2 of A21).…”

Section: Introductionmentioning

confidence: 90%

Search for a distance-dependent Baryonic Tully-Fisher Relation at low redshifts

Krishak¹,

Desai²

2022

TheOJA

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A recent work (Alestas et al. 2021) has found a statistically significant transition in the Baryonic Tully-Fisher relation (BTFR) using low redshift data (z < 0.1), with the transitions occurring at about 9 and 17 Mpc. Motivated by this finding, we carry out a variant of this analysis by fitting the data to an augmented BTFR, where both the exponent as well as normalization constant vary as a function of distance. We find that both the exponent and normalization constant show only a marginal variation with distance, and are consistent with a constant value, to within 2σ. We also checked to see if there is a statistically significant difference between the BTFR results after bifurcating the dataset at distances of 9 and 17 Mpc. We find that almost all the sets of subsamples obey the BTFR with χ 2 /dof close to 1 and the best-fit parameters consistent across the subsamples. Only the subsample with D < 17 Mpc shows a marginal discrepancy (at 1.75σ) with respect to the BTFR. Therefore, we do not find any evidence for statistically significant differences in the BTFR at distances of 9 and 17 Mpc.

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Section: Introductionmentioning

confidence: 90%

Search for a distance-dependent Baryonic Tully-Fisher Relation at low redshifts

Krishak¹,

Desai²

2022

TheOJA

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“…This review will also not discuss the closely related topic of tests of Weak equivalence principle using astrophysical observations (for eg. [37]) or tests of variation of fundamental constants [38,39].…”

Section: H(z)mentioning

confidence: 99%

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Desai¹

2023

Preprint

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Lorentz invariance is one of the fundamental tenets of Special Relativity, and has been extensively tested with laboratory and astrophysical observations. However, many quantum gravity models and theories beyond the Standard Model of Particle Physics predict a violation of Lorentz invariance at energies close to Planck scale. This article reviews observational and experimental tests of Lorentz invariance violation (LIV) with photons, neutrinos and gravitational waves. Most astrophysical tests of LIV using photons are based on searching for a correlation of the spectral lag data with redshift and energy. These have been primarily carried out using compact objects such as pulsars, Active Galactic Nuclei (AGN), and Gamma-ray bursts (GRB). There have also been some claims for LIV from some of these spectral lag observations with GRBs, which however are in conflict with the most stringent limits obtained from other LIV searches. Searches have also been carried out using polarization measurements from GRBs and AGNs. For neutrinos, tests have been made using both astrophysical observations at MeV energies (from SN 1987A) as well as in the TeV-PeV energy range based on IceCube observations, atmospheric neutrinos, and long-baseline neutrino oscillation experiments. Cosmological tests of LIV entail looking for a constancy of the speed of light as a function of redshift using multiple observational probes, as well as looking for birefringence in Cosmic Microwave background observations. This article will review all of these aforementioned observational tests of LIV, including results which are in conflict with each other.

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“…where L P = (hG/c 3 ) 1/2 ≈ 10 −33 cm is the Planck length. In NLG, G is a constant of nature as well, since there is no firm observational evidence in support of a variable G. Meanwhile, terrestrial experiments regarding Newton's law and the measurement of Newton's constant of gravitation G continue at present [31,32]. On the other hand, interesting experiments have been proposed recently to measure directly deviations from the inverse square law of gravity in the solar system out to 100 astronomical units (AU) and beyond [33][34][35][36].…”

Section: Gravitational Force In Nlgmentioning

confidence: 99%

Nonlocal Gravity: Modification of Newtonian Gravitational Force in the Solar System

Roshan

Mashhoon

2022

Universe

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Nonlocal gravity (NLG) is a classical nonlocal generalization of Einstein’s theory of gravitation developed in close analogy with the nonlocal electrodynamics of media. It appears that the nonlocal aspect of the universal gravitational interaction could simulate dark matter. Within the Newtonian regime of NLG, we investigate the deviation of the gravitational force from the Newtonian inverse square law as a consequence of the existence of the effective dark matter. In particular, we work out the magnitude of this deviation in the solar system out to 100 astronomical units. Moreover, we give an improved lower limit for the short-range parameter of the reciprocal kernel of NLG.

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Search for variability in Newton’s constant using local gravitational acceleration measurements

Cited by 6 publications

References 20 publications

Search for a distance-dependent Baryonic Tully-Fisher Relation at low redshifts

Search for a distance-dependent Baryonic Tully-Fisher Relation at low redshifts

Astrophysical and Cosmological Searches for Lorentz Invariance Violation

Nonlocal Gravity: Modification of Newtonian Gravitational Force in the Solar System

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