Tidal effects away from the equatorial plane in Kerr backgrounds

Banerjee, Pritam; Paul, Suvankar; Shaikh, Rajibul; Sarkar, Tapobrata

doi:10.1016/j.physletb.2019.05.048

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…This procedure is performed for different central density ρ c until the Roche lobe filling condition is satisfied. At this critical condition, ∂ρ/∂q 1 at the surface of the star at (q s , 0, 0) becomes smoothly zero (for more details on the numerical procedure, see Banerjee et al (2019)).…”

Section: Numerical Proceduresmentioning

confidence: 99%

A stellar constraint on Eddington-inspired Born-Infeld gravity from cataclysmic variable binaries

Banerjee,

Garain,

Paul

et al. 2021

Preprint

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Eddington-inspired Born-Infeld gravity is an important modification of Einstein's general relativity, which can give rise to non-singular cosmologies at the classical level, and avoid the end-stage singularity in a gravitational collapse process. In the Newtonian limit, this theory gives rise to a modified Poisson's equation, as a consequence of which stellar observables acquire model dependent corrections, compared to the ones computed in the low energy limit of general relativity. This can in turn be used to establish astrophysical constraints on the theory. Here, we obtain such a constraint using observational data from cataclysmic variable binaries. In particular, we consider the tidal disruption limit of the secondary star by a white dwarf primary. The Roche lobe filling condition of this secondary star is used to compute stellar observables in the modified gravity theory in a numerical scheme. These are then contrasted with the values obtained by using available data on these objects, via a Monte Carlo error progression method. This way, we are able to constrain the theory within 5σ confidence level.

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Section: Numerical Proceduresmentioning

confidence: 99%

A stellar constraint on Eddington-inspired Born-Infeld gravity from cataclysmic variable binaries

Banerjee,

Garain,

Paul

et al. 2021

Preprint

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“…Details of the numerical procedure as well as determination of the constants, viz. C, p, q g , etc from different boundary conditions can be found in [64].…”

Section: Jcap03(2021)042mentioning

confidence: 99%

Tidal disruption near black holes and their mimickers

Banerjee

Paul

Shaikh

et al. 2021

J. Cosmol. Astropart. Phys.

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Black holes and wormholes are solutions of Einstein's field equations, both of which, from afar, can look like a central mass. We show here that although at large distances both behave like Newtonian objects, close to the event horizon or to the throat, black holes and wormholes have different tidal effects on stars, due to their respective geometries. We quantify this difference by a numerical procedure in the Schwarzschild black hole and the exponential wormhole backgrounds, and compare the peak fallback rates of tidal debris in these geometries. The tidal disruption rates in these backgrounds are also computed. It is shown that these quantities are a few times higher for wormholes, compared to the black hole cases.

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“…This procedure is repeated until the desired convergence is obtained. A full numerical description is given in [37]. We find the minimum possible central density ρ crit for which the star just remains stable in the tidal field.…”

Section: Preliminaries and Setupmentioning

confidence: 99%

Constraining modified gravity from tidal phenomena in binary stars

Banerjee,

Garain,

Paul

et al. 2020

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In beyond-Horndeski theories of gravity, the Vainshtein screening mechanism might only be partially effective inside stellar objects. This results in a modification of the pressure balance equation inside stars, often characterized by a single parameter (Υ) in isotropic systems. We show how to constrain such theories of modified gravity, using tidal effects. We study such effects in cataclysmic variable star binaries and numerically obtain limits on the critical masses of the donor stars, below which they are tidally disrupted, by modeling them in beyond-Horndeski theories. This is contrasted with values of the donor masses, obtained using existing observational data, by a Monte Carlo error progression method. A best fit scenario of the two yields a parametric constraint in the theories that we consider, within the approximations used. Here, we obtain the allowed range 0 ≤ Υ ≤ 0.47.

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Tidal effects away from the equatorial plane in Kerr backgrounds

Cited by 9 publications

References 20 publications

A stellar constraint on Eddington-inspired Born-Infeld gravity from cataclysmic variable binaries

A stellar constraint on Eddington-inspired Born-Infeld gravity from cataclysmic variable binaries

Tidal disruption near black holes and their mimickers

Constraining modified gravity from tidal phenomena in binary stars

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