Journal
EUROPEAN PHYSICAL JOURNAL PLUS
Volume 134, Issue 1, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1140/epjp/i2019-12392-9
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Funding
- DFG [BL 1553]
- DFG Research Training Group 1620 Models of Gravity
- COST Action [CA16104]
- Croatian Science Foundation [IP-2014-09-3258]
- H2020 Twinning Project [692194 RBI-T-WINNING]
- European Union through the European Regional Development Fund - the Competitiveness and Cohesion Operational Programme [KK.01.1.1.06]
- Bulgarian NSF Grant [DCOST 01/6]
- European Social Fund, the Ministry of Science, Research and the Arts Baden-Wurttemberg
- Baden-Wurttemberg Stiftung
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.We address quasinormal modes of compact objects in several alternative theories of gravity. In particular, we focus on black holes and neutron stars with scalar hair. We consider black holes in dilaton-Einstein-Gau ss-Bonnet theory, and in a generalized scalar-Einstein-Gau ss-Bonnet theory. In the latter case scalarized black holes arise, and we study the stability of the different branches of solutions. In particular, we discuss how the spectrum of quasinormal modes is changed by the presence of a non-trivial scalar field outside the black hole horizon. We discuss the existence of an (effective) minimum mass in these models, and how the spectrum of modes becomes richer as compared to general relativity, when a scalar field is present. Subsequently, we discuss the effect of scalar hair for realistic neutron star models. Here we consider R-2 gravity, scalar-tensor theory, a particular subsector of Horndeski theory with a non-minimal derivative coupling, and again dilatonic-Einstein-Gau ss-Bonnet theory. Because of the current lack of knowledge on the internal composition of the neutron stars, we focus on universal relations for the quasinormal modes, that are largely independent of the equations of state and thus the matter content of the stars.
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