Hyperons in neutron stars within an Eddington-inspired Born-Infeld theory of gravity

Qauli, Ali Ikhsanul; Iqbal, Muhammad; Sulaksono, A.; Ramadhan, H. S.

doi:10.1103/physrevd.93.104056

Cited by 31 publications

(47 citation statements)

References 58 publications

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“…An exact (and exotic) analytical solution of the relativistic equations was also found there. More recently, the influence of hyperons in the equation of state has been explicitly considered in [312] to illustrate that the "hyperon problem" found in neutron star models within GR may be avoided in the EiBI theory. Their conclusions are in agreement with the previous literature on this topic.…”

Section: Stellar Structurementioning

confidence: 99%

Born–Infeld inspired modifications of gravity

et al. 2018

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General Relativity has shown an outstanding observational success in the scales where it has been directly tested. However, modifications have been intensively explored in the regimes where it seems either incomplete or signals its own limit of validity. In particular, the breakdown of unitarity near the Planck scale strongly suggests that General Relativity needs to be modified at high energies and quantum gravity effects are expected to be important. This is related to the existence of spacetime singularities when the solutions of General Relativity are extrapolated to regimes where curvatures are large. In this sense, Born-Infeld inspired modifications of gravity have shown an extraordinary ability to regularise the gravitational dynamics, leading to non-singular cosmologies and regular black hole spacetimes in a very robust manner and without resorting to quantum gravity effects. This has boosted the interest in these theories in applications to stellar structure, compact objects, inflationary scenarios, cosmological singularities, and black hole and wormhole physics, among others. We review the motivations, various formulations, and main results achieved within these theories, including their observational viability, and provide an overview of current open problems and future research opportunities.

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Section: Stellar Structurementioning

confidence: 99%

Born–Infeld inspired modifications of gravity

et al. 2018

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“…The theory is equivalent to Einstein's GR in vacuum but differs from it within matter. Since its introduction, various aspects of EiBI gravity have been studied by many researchers in the recent past, including black holes [47,[51][52][53][54][55][56][57][58][59][60], wormholes [61][62][63][64], compact stars [65][66][67][68][69], cosmological aspects [47,[70][71][72][73][74][75][76][77][78][79][80], astrophysical aspects [81][82][83], gravitational collapse [84,85], gravitational waves [86,87], implications in nongravitational contexts like particle physics [88] etc. See [89] for a recent review on various studies in EiBI gravity.…”

Section: Introductionmentioning

confidence: 99%

Wormholes with nonexotic matter in Born-Infeld gravity

Shaikh

2018

Phys. Rev. D

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We show that, in contrast to general relativity, in Eddington-inspired Born-Infeld gravity (EiBI), a violation of the null convergence condition does not necessarily lead to a violation of the null energy condition, by establishing a relationship between them. This serves as a motivation for finding wormhole solutions which can be supported by nonexotic matter in this gravity theory. We then obtain exact solutions of the field equations in EiBI gravity coupled to arbitrary nonlinear electrodynamics and anisotropic fluids. Depending on the signs and values of different parameters, the general solutions can represent both black holes and wormholes. In this work, we analyze the wormhole solutions. These wormholes are supported by nonexotic matter, i.e., matter satisfying all the energy conditions. As special cases of our general solutions, we work out several specific examples by considering Maxwell, power-law, Born-Infeld electrodynamics models and a particular form of an anisotropic fluid. * rajibul.shaikh@tifr.res.in

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“…For comparison, we include also the NSs results obtained by using relativistic mean field (RMF) model by employing the BSP parameter set with and without hyperons. 36,37 For the case NS with hyperons we use SU(6) as a standard prescription for determining the hyperons coupling constants. The stiffness of BSP parameter set EOS is in between the one of the stiffest RMF EOS (NL3) and the softness RMF EOS (FSU).…”

Section: Scalar Boson Effect On Equation Of State Of Self-interactingmentioning

confidence: 99%

Effect of scalar boson on fermionic dark stars

Wahidin

Rahmansyah

Sulaksono

2019

Int. J. Mod. Phys. D

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The role of scalar boson exchange as a mediator of the fermionic dark particle interaction and the mass of dark particle on the bulk properties of fermionic dark stars including their moment of inertia and tidal deformability are studied. We have found that the role of the attractive nature of the scalar boson exchange and the fermionic dark particle mass can control the stiffness of the fermionic dark star equation of state. By increasing the strength of scalar boson coupling, the fermionic dark star becomes more compact. As a consequence, if scalar boson exchange contribution is included the compactness of a dark star can exceed C=0.22. We also compare the fermionic dark stars moment of inertia and tidal deformability to those of neutron stars (with and without hyperons in neutron star core) predicted by relativistic mean field model. It is evidence that the properties of both types of stars are quite different. We also have found that the universal I-Love relation in fermionic dark stars is not affected by scalar boson exchange contribution and the fermionic dark particle mass. Possible observations of fermionic dark stars are also discussed.

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Hyperons in neutron stars within an Eddington-inspired Born-Infeld theory of gravity

Cited by 31 publications

References 58 publications

Born–Infeld inspired modifications of gravity

Born–Infeld inspired modifications of gravity

Wormholes with nonexotic matter in Born-Infeld gravity

Effect of scalar boson on fermionic dark stars

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