Shadow images of compact objects in beyond Horndeski theory
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/05/007
Abstract: A beyond Horndeski theory is considered that admits wormholes, black holes and naked singularities. In this theory the shadow images of the black holes and the exotic compact objects (ECOs), illuminated by an optically and… read more here.
Keywords: shadow images; horndeski theory; compact objects; theory shadow ... See more keywords
Linear instability of hairy black holes in Horndeski theory
Sign Up to like & getrecommendations! Published in 2024 at "Chinese Physics C"
DOI: 10.1088/1674-1137/ad3eff
Abstract: Horndeski theory constitutes the most general model of scalar-tensor theories. It has attracted much attention in recent years in relation with black holes, celestial dynamics, stability analysis, etc. It is important to note that, for… read more here.
Keywords: linear instability; horndeski theory; instability; instability hairy ... See more keywords
Reviving Horndeski theory using teleparallel gravity after GW170817
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.084060
Abstract: Horndeski gravity was highly constrained from the recent gravitational wave observations by the LIGO Collaboration down to $|c_{g}/c-1|\gtrsim 10^{-15}$. In this Letter we study the tensorial perturbations in a flat cosmological background for an analogue… read more here.
Keywords: teleparallel gravity; theory using; horndeski theory; gravity ... See more keywords
No static spherically symmetric wormholes in Horndeski theory
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DOI: 10.1103/physrevd.97.124040
Abstract: We consider the Horndeski theory in four-dimensional space-time. We show that this theory does not admit stable, static, spherically symmetric, asymptotically flat, Lorentzian wormholes. read more here.
Keywords: spherically symmetric; symmetric wormholes; wormholes horndeski; static spherically ... See more keywords
Violation of Thermal Conductivity Bound in Horndeski Theory
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.061902
Abstract: We consider AdS black planar black hole in the four-dimensional Einstein-Maxwell-Horndeski theory with two free axions and analyse the thermodynamics of the black hole. We calculate the holographic thermoelectric conductivities of the dual field theory… read more here.
Keywords: violation thermal; thermal conductivity; conductivity; conductivity bound ... See more keywords
The Polarizations of Gravitational Waves
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DOI: 10.3390/universe4080085
Abstract: The gravitational wave provides a new method to examine General Relativity and its alternatives in the high speed, strong field regime. Alternative theories of gravity generally predict more polarizations than General Relativity, so it is… read more here.
Keywords: polarizations gravitational; gravitational waves; polarization; gravity ... See more keywords