Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field

Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field

We present a brief review of general results about non-rotating neutron stars in simple <inline-formula> <math display="inline"> <semantics> <msup> <mi>R</mi> <mn>2</mn> </msup> </semantics> </math> </inline-formula> g...

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Main Authors: Artyom Astashenok, Sergey Odintsov
Format: Article
Language:English
Published: MDPI AG 2020-07-01
Series:Particles
Subjects:
neutron stars
modified gravity
axions
Online Access:https://www.mdpi.com/2571-712X/3/3/36
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spelling doaj-fa6b02ff5b514cc5a0784364dac64e1e2020-11-25T03:31:08ZengMDPI AGParticles2571-712X2020-07-0133653254210.3390/particles3030036Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion FieldArtyom Astashenok0Sergey Odintsov1Mathematics and IT, Institute of Physics, Immanuel Kant Baltic Federal University, Nevskogo str., 14, 236041 Kaliningrad, RussiaICREA, Passeig Luis Companys, 23, 08010 Barcelona, SpainWe present a brief review of general results about non-rotating neutron stars in simple <inline-formula> <math display="inline"> <semantics> <msup> <mi>R</mi> <mn>2</mn> </msup> </semantics> </math> </inline-formula> gravity and its extension with a scalar axion field. Modified Einstein equations are presented for metrics in isotropical coordinates. The mass–radius relation, mass profile and dependence of mass from central density on various equations of state are given in comparison to general relativity.https://www.mdpi.com/2571-712X/3/3/36neutron starsmodified gravityaxions
collection DOAJ
language English
format Article
sources DOAJ
author Artyom Astashenok
Sergey Odintsov
spellingShingle Artyom Astashenok
Sergey Odintsov
Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
Particles
neutron stars
modified gravity
axions
author_facet Artyom Astashenok
Sergey Odintsov
author_sort Artyom Astashenok
title Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
title_short Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
title_full Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
title_fullStr Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
title_full_unstemmed Neutron Stars in <i>f</i>(<i>R</i>)-Gravity and Its Extension with a Scalar Axion Field
title_sort neutron stars in <i>f</i>(<i>r</i>)-gravity and its extension with a scalar axion field
publisher MDPI AG
series Particles
issn 2571-712X
publishDate 2020-07-01
description We present a brief review of general results about non-rotating neutron stars in simple <inline-formula> <math display="inline"> <semantics> <msup> <mi>R</mi> <mn>2</mn> </msup> </semantics> </math> </inline-formula> gravity and its extension with a scalar axion field. Modified Einstein equations are presented for metrics in isotropical coordinates. The mass–radius relation, mass profile and dependence of mass from central density on various equations of state are given in comparison to general relativity.
topic neutron stars
modified gravity
axions
url https://www.mdpi.com/2571-712X/3/3/36
work_keys_str_mv AT artyomastashenok neutronstarsinifiirigravityanditsextensionwithascalaraxionfield
AT sergeyodintsov neutronstarsinifiirigravityanditsextensionwithascalaraxionfield
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