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Tidal Love numbers of neutron stars in f(R) gravity

The recent detection of gravitational waves from a neutron star merger was a significant step towards constraining the nuclear matter equation of state by using the tidal Love numbers (TLNs) of the merging neutron stars. Measuring or constraining the neutron star TLNs allows us in principle to exclu...

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Autores principales: Yazadjiev, Stoytcho S., Doneva, Daniela D., Kokkotas, Kostas D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6244867/
https://www.ncbi.nlm.nih.gov/pubmed/30524193
http://dx.doi.org/10.1140/epjc/s10052-018-6285-z
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author Yazadjiev, Stoytcho S.
Doneva, Daniela D.
Kokkotas, Kostas D.
author_facet Yazadjiev, Stoytcho S.
Doneva, Daniela D.
Kokkotas, Kostas D.
author_sort Yazadjiev, Stoytcho S.
collection PubMed
description The recent detection of gravitational waves from a neutron star merger was a significant step towards constraining the nuclear matter equation of state by using the tidal Love numbers (TLNs) of the merging neutron stars. Measuring or constraining the neutron star TLNs allows us in principle to exclude or constraint many equations of state. This approach, however, has the drawback that many modified theories of gravity could produce deviations from General Relativity similar to the deviations coming from the uncertainties in the equation of state. The first and the most natural step in resolving the mentioned problem is to quantify the effects on the TLNs from the modifications of General Relativity. With this motivation in mind, in the present paper we calculate the TLNs of (non-rotating) neutron stars in [Formula: see text] -gravity. More precisely, by solving numerically the perturbation equations, we calculate explicitly the polar and the axial [Formula: see text] TLNs for three characteristic realistic equations of state and compare the results to General Relativity. Our results show that while the polar TLNs are slightly influenced by the [Formula: see text] modification of General Relativity, the axial TLNs can be several times larger (in terms of the absolute value) compared to the general relativistic case.
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spelling pubmed-62448672018-12-04 Tidal Love numbers of neutron stars in f(R) gravity Yazadjiev, Stoytcho S. Doneva, Daniela D. Kokkotas, Kostas D. Eur Phys J C Part Fields Regular Article - Theoretical Physics The recent detection of gravitational waves from a neutron star merger was a significant step towards constraining the nuclear matter equation of state by using the tidal Love numbers (TLNs) of the merging neutron stars. Measuring or constraining the neutron star TLNs allows us in principle to exclude or constraint many equations of state. This approach, however, has the drawback that many modified theories of gravity could produce deviations from General Relativity similar to the deviations coming from the uncertainties in the equation of state. The first and the most natural step in resolving the mentioned problem is to quantify the effects on the TLNs from the modifications of General Relativity. With this motivation in mind, in the present paper we calculate the TLNs of (non-rotating) neutron stars in [Formula: see text] -gravity. More precisely, by solving numerically the perturbation equations, we calculate explicitly the polar and the axial [Formula: see text] TLNs for three characteristic realistic equations of state and compare the results to General Relativity. Our results show that while the polar TLNs are slightly influenced by the [Formula: see text] modification of General Relativity, the axial TLNs can be several times larger (in terms of the absolute value) compared to the general relativistic case. Springer Berlin Heidelberg 2018-10-10 2018 /pmc/articles/PMC6244867/ /pubmed/30524193 http://dx.doi.org/10.1140/epjc/s10052-018-6285-z Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3
spellingShingle Regular Article - Theoretical Physics
Yazadjiev, Stoytcho S.
Doneva, Daniela D.
Kokkotas, Kostas D.
Tidal Love numbers of neutron stars in f(R) gravity
title Tidal Love numbers of neutron stars in f(R) gravity
title_full Tidal Love numbers of neutron stars in f(R) gravity
title_fullStr Tidal Love numbers of neutron stars in f(R) gravity
title_full_unstemmed Tidal Love numbers of neutron stars in f(R) gravity
title_short Tidal Love numbers of neutron stars in f(R) gravity
title_sort tidal love numbers of neutron stars in f(r) gravity
topic Regular Article - Theoretical Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6244867/
https://www.ncbi.nlm.nih.gov/pubmed/30524193
http://dx.doi.org/10.1140/epjc/s10052-018-6285-z
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