Stable wormholes in scalar-tensor theories
Sign Up to like & getrecommendations! Published in 2019 at "Journal of High Energy Physics"
DOI: 10.1007/jhep01(2019)221
Abstract: A bstractWe reconsider the issue of whether scalar-tensor theories can admit stable wormhole configurations supported by a non-trivial radial profile for the scalar field. Using a recently proposed effective theory for perturbations around static, spherically… read more here.
Keywords: stable wormholes; scalar tensor; tensor theories; wormholes scalar ... See more keywords
CMB spectrum in unified EFT of dark energy: scalar-tensor and vector-tensor theories
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/07/056
Abstract: We study the cosmic microwave background (CMB) radiation in the unified description of the effective field theory (EFT) of dark energy that accommodates both scalar-tensor and vector-tensor theories. The boundaries of different classes of theories… read more here.
Keywords: vector tensor; dark energy; tensor theories; tensor ... See more keywords
Nature of Phase Transitions and Metastability in Scalar-Tensor Theories.
Sign Up to like & getrecommendations! Published in 2025 at "Physical review letters"
DOI: 10.1103/14xz-d7xf
Abstract: Compact stars above a critical stellar mass develop large scalar fields in some scalar-tensor theories. This scenario called spontaneous scalarization has been an intense topic of study since it passes weak-field gravity tests naturally while… read more here.
Keywords: nature phase; phase transitions; scalar tensor; transitions metastability ... See more keywords
Probing observational bounds on scalar-tensor theories from standard sirens
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.044041
Abstract: Standard sirens are the gravitational wave (GW) analog of the astronomical standard candles, and can provide powerful information about the dynamics of the Universe. In this work, we simulate a catalog with 1000 standard siren… read more here.
Keywords: probing observational; scalar tensor; standard sirens; tensor theories ... See more keywords
Disformal transformation of stationary and axisymmetric solutions in modified gravity
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.124017
Abstract: The extended scalar-tensor and vector-tensor theories admit black hole solutions with the nontrivial profiles of the scalar and vector fields, respectively. The disformal transformation maps a solution in a class of the scalar-tensor or vector-tensor… read more here.
Keywords: tensor; scalar tensor; stationary axisymmetric; tensor theories ... See more keywords
Sudden cosmological singularities in Aether scalar-tensor theories
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.109.104077
Abstract: In this work we analyze the possibility of sudden cosmological singularities, also known as type-II singularities, in the background of a Friedmann-Lema\^itre-Robertson-Walker (FLRW) geometry in an extension of General Relativity (GR) known as Aether scalar-tensor… read more here.
Keywords: cosmological singularities; time; scalar tensor; sudden cosmological ... See more keywords
Axial perturbations of hairy black holes in generalized scalar-tensor theories
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.110.024065
Abstract: Gravitational wave observations can test the validity of General Relativity (GR) in the strong field regime. Certain classes of scalar-tensor theories indeed predict that compact objects can exhibit significant deviations from their GR counterparts. Here… read more here.
Keywords: perturbations hairy; scalar tensor; tensor theories; axial perturbations ... See more keywords
Generalization of conformal-disformal transformations of the metric in scalar-tensor theories
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.110.064063
Abstract: We study new classes of metric transformations in the context of scalar-tensor theories, which involve both higher derivatives of the scalar field and derivatives of the metric itself. In general, such transformations are not invertible… read more here.
Keywords: generalization conformal; scalar tensor; disformal transformations; tensor theories ... See more keywords
Dynamics of compact binary systems in scalar-tensor theories: Equations of motion to the third post-Newtonian order
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.98.044004
Abstract: Scalar-tensor theories are one of the most natural and well-constrained alternative theories of gravity, while still allowing for significant deviations from general relativity. We present the equations of motion of nonspinning compact binary systems at… read more here.
Keywords: compact binary; order; binary systems; equations motion ... See more keywords
On the evolution and stability of cosmological perturbations in higher order scalar–tensor theories of gravity
Sign Up to like & getrecommendations! Published in 2019 at "Canadian Journal of Physics"
DOI: 10.1139/cjp-2017-0495
Abstract: We study a new type of extended theory of gravity in the framework of general scalar–tensor theories in which the higher order terms of curvature are coupled with a scalar field and its derivatives. We… read more here.
Keywords: scalar tensor; stability; higher order; evolution ... See more keywords
Orthogonal splitting in degenerate higher-order scalar-tensor theories
Sign Up to like & getrecommendations! Published in 2024 at "International Journal of Geometric Methods in Modern Physics"
DOI: 10.1142/s0219887825400109
Abstract: We explore a comprehensive analysis of the formalism governing the gravitational field equations in degenerate higher-order scalar-tensor theories. The propagation of these theories in the vacuum has a maximum of three degrees of freedom and… read more here.
Keywords: degenerate higher; higher order; scalar tensor; tensor theories ... See more keywords