Cosmological instability of scalar-Gauss-Bonnet theories exhibiting scalarization
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/06/023
Abstract: In a subclass of scalar-tensor theories, it has been shown that standard general relativity solutions of neutron stars and black holes with trivial scalar field profiles are unstable. Such an instability leads to solutions which… read more here.
Keywords: scalarization; gauss bonnet; instability; scalar gauss ... See more keywords
Einstein-scalar–Gauss-Bonnet black holes: Analytical approximation for the metric and applications to calculations of shadows
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DOI: 10.1103/physrevd.101.044054
Abstract: Recently, numerical solutions to the field equations of Einstein-scalar--Gauss-Bonnet (EsGB) gravity that correspond to black holes with nontrivial scalar hair have been reported. Here, we employ the method of the continued-faction expansion in terms of… read more here.
Keywords: black holes; scalar gauss; einstein scalar; analytical approximation ... See more keywords
No static regular black holes in Einstein-complex-scalar-Gauss-Bonnet gravity
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DOI: 10.1103/physrevd.102.024034
Abstract: In this brief report, we investigate the existence of four-dimensional static spherically symmetric black holes (BHs) in the Einstein-complex-scalar-Gauss-Bonnet gravity with an arbitrary potential V(ϕ) and a coupling f(ϕ) between the scalar field ϕ and… read more here.
Keywords: bonnet gravity; complex scalar; black holes; scalar gauss ... See more keywords
Black holes and binary mergers in scalar Gauss-Bonnet gravity: Scalar field dynamics
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DOI: 10.1103/physrevd.99.064035
Abstract: We study the nonlinear dynamics of black holes that carry scalar hair and binaries composed of such black holes. The scalar hair is due to a linear or exponential coupling between the scalar and the… read more here.
Keywords: black holes; scalar field; gauss bonnet; scalar gauss ... See more keywords
Zero-Delay Multiple Descriptions of Stationary Scalar Gauss-Markov Sources
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DOI: 10.3390/e21121185
Abstract: In this paper, we introduce the zero-delay multiple-description problem, where an encoder constructs two descriptions and the decoders receive a subset of these descriptions. The encoder and decoders are causal and operate under the restriction… read more here.
Keywords: scalar gauss; gauss markov; zero delay; delay ... See more keywords