Gravitational collapse in cubic Horndeski theories
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DOI: 10.1088/1361-6382/abb693
Abstract: We study spherically symmetric gravitational collapse in cubic Horndeski theories of gravity. By varying the coupling constants and the initial amplitude of the scalar field, we determine the region in the space of couplings and… read more here.
Keywords: collapse cubic; field; horndeski theories; cubic horndeski ... See more keywords
A no-hair theorem for stars in Horndeski theories
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2017/07/037
Abstract: We consider a generic scalar-tensor theory involving a shift-symmetric scalar field and minimally coupled matter fields. We prove that the Noether current associated with shift-symmetry vanishes in regular, spherically symmetric and static spacetimes. We use… read more here.
Keywords: cosmology; hair theorem; horndeski theories; theorem stars ... See more keywords
Well-posed formulation of Lovelock and Horndeski theories
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DOI: 10.1103/physrevd.101.124003
Abstract: We study the initial value problem for Lovelock and Horndeski theories of gravity. We show that the equations of motion of these theories can be written in a form that, at weak coupling, is strongly… read more here.
Keywords: horndeski theories; lovelock horndeski; well posed; posed formulation ... See more keywords
Large-scale structure phenomenology of viable Horndeski theories
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DOI: 10.1103/physrevd.97.043519
Abstract: Phenomenological functions $\Sigma$ and $\mu$, also known as $G_{\rm light}/G$ and $G_{\rm matter}/G$, are commonly used to parameterize modifications of the growth of large-scale structure in alternative theories of gravity. We study the values these… read more here.
Keywords: large scale; viable horndeski; horndeski theories; gravity ... See more keywords
Horndeski theories confront the Gravity Probe B experiment
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DOI: 10.1103/physrevd.97.124007
Abstract: In this work we have investigated various properties of a spinning gyroscope in the context of Horndeski theories. In particular, we have focused on two specific situations --- (a) when the gyroscope follows a geodesic… read more here.
Keywords: gravity; probe experiment; horndeski theories; gravity probe ... See more keywords