Spontaneous scalarization with an extremely massive field and heavy neutron stars
書誌事項
- 公開日
- 2017-10-12
- 資源種別
- journal article
- 権利情報
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- https://link.aps.org/licenses/aps-default-license
- DOI
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- 10.1103/physrevd.96.084026
- 10.48550/arxiv.1707.02809
- 公開者
- American Physical Society (APS)
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説明
We investigate the internal structure and the mass-radius relation of neutron stars in a recently proposed scalar-tensor theory dubbed asymmetron in which a massive scalar field undergoes spontaneous scalarization inside neutron stars. We focus on the case where the Compton wavelength is shorter than 10 km, which has not been investigated in the literature. By solving the modified Einstein equations, either purely numerically or by partially using a semianalytic method, we find that not only the weakening of gravity by spontaneous scalarization but also the scalar force affect the internal structure significantly in the massive case. We also find that the maximum mass of neutron stars is larger for certain parameter sets than that in general relativity and reaches 2 solar mass even if the effect of strange hadrons is taken into account. There is even a range of parameters where the maximum mass of neutron stars largely exceeds the threshold that violates the causality bound in general relativity.
19 pages, 16 figures; published version
収録刊行物
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- Physical Review D
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Physical Review D 96 (8), 084026-, 2017-10-12
American Physical Society (APS)
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詳細情報 詳細情報について
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- CRID
- 1360002217829238912
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- ISSN
- 24700029
- 24700010
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
