Constraint on energy-momentum squared gravity from neutron stars and its cosmological implications

被引：72

作者：

Akarsu, Ozgur ^{[1
]}

Barrow, John D. ^{[2
]}

Cikintoglu, Sercan ^{[1
]}

Eksi, K. Yavuz ^{[1
]}

Katirci, Nihan ^{[1
]}

机构：

[1] Istanbul Tech Univ, Dept Phys, TR-34469 Istanbul, Turkey

[2] Univ Cambridge, Ctr Math Sci, DAMTP, Wilberforce Rd, Cambridge CB3 0WA, England

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 12期

基金：

英国科学技术设施理事会;

关键词：

EQUATION-OF-STATE; MATTER; MASSES; HYPERONS;

D O I：

10.1103/PhysRevD.97.124017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Deviations from the predictions of general relativity due to energy-momentum squared gravity (EMSG) are expected to become pronounced in the high density cores of neutron stars. We derive the hydrostatic equilibrium equations in EMSG and solve them numerically to obtain the neutron star mass-radius relations for four different realistic equations of state. We use the existing observational measurements of the masses and radii of neutron stars to constrain the free parameter, alpha, that characterizes the coupling between matter and spacetime in EMSG. We show that -10(-38) cm(3)/erg < alpha < +10(-37) cm(3)/erg. Under this constraint, we discuss what contributions EMSG can provide to the physics of neutron stars, in particular, their relevance to the so called hyperon puzzle in neutron stars. We also discuss how EMSG alters the dynamics of the early universe from the predictions of the standard cosmological model. We show that EMSG leaves the standard cosmology safely unaltered back to t similar to 10(-4) seconds at which the energy density of the universe is similar to 10(34) erg cm(-3).

引用

页数：17

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