Strange quark stars in Hořava gravity - INSPIRE

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Strange quark stars in Hořava gravity

Grigoris Panotopoulos
(
- Frontera U.
)

2023

15 pages

Contribution to:

- MG16
, 1054-1068

Published: 2023

DOI:

10.1142/9789811269776_0083

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Abstract: (World Scientific)

Non-rotating strange quark stars made of isotropic matter in Lorentz-violating theories of gravity are studied. In particular, Hořava gravity and Einstein-æther theory are considered. For quark matter we adopt both linear and non-linear equations-of-state, corresponding to the MIT bag model and color flavor locked phase, respectively. The new, modified structure equations generalize the usual Tolman-Oppenheimer-Volkoff equations valid in Einstein’s General Relativity. A dimensionless parameter ν measures the deviation from the standard TOV equations, which are recovered in the appropriate limit. We compute some properties, such as masses, radii as well as the factor of compactness of the stars, and we show pictorially the impact of the parameter ν on the mass-to-radius relationships for several different equations-of-state. Other physical considerations, such as stability criteria, causality and energy conditions, are also considered, and they are all found to be fulfilled.

Relativistic stars
Composition of astronomical objects
Theories of gravity other than GR
quark: star
equation of state: nonlinear
star: relativistic
quark: matter
gravitation: Horava-Lifshitz
Tolman-Oppenheimer-Volkoff equation
causality

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