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Scalarized non-topological neutron stars in multi-scalar Gauss–Bonnet gravity

Authors :
Kalin V. Staykov
Radostina Z. Zheleva
Source :
European Physical Journal C: Particles and Fields, Vol 82, Iss 2, Pp 1-7 (2022)
Publication Year :
2022
Publisher :
SpringerOpen, 2022.

Abstract

Abstract In the present paper we construct novel non-topological, spontaneously scalarized neutron stars in multi-scalar Gauss–Bonnet gravity with maximally symmetric target space, and nontrivial map $$\varphi :spacetime \rightarrow target\ space$$ φ : s p a c e t i m e → t a r g e t s p a c e . The theory is characterized by the fact that for some classes of coupling functions the field equations allow solutions with trivial scalar field, which coincide with the general relativistic ones. For a certain range of parameters those solutions lose stability and new branches of solutions with nontrivial scalar field bifurcate from the trivial branch. For a given set of parameters, those branches are characterized by the number of zeros of the scalar field, and they are energetically more favorable than the general relativistic ones.

Details

Language :
English
ISSN :
14346044 and 14346052
Volume :
82
Issue :
2
Database :
Directory of Open Access Journals
Journal :
European Physical Journal C: Particles and Fields
Publication Type :
Academic Journal
Accession number :
edsdoj.6b9dd716b4a64310a06d01968705c761
Document Type :
article
Full Text :
https://doi.org/10.1140/epjc/s10052-022-10046-0