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   Articles with "scalar tensor" as a keyword



Recent Developments in Degenerate Higher Order Scalar Tensor Theories

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recommendations! Published in 2024 at "Annalen der Physik"

DOI: 10.1002/andp.202400263

Abstract: Degenerate Higher Order Scalar Tensor (DHOST) theories are the most general scalar‐tensor theories whose Lagrangian depends on the metric tensor and a single scalar field and its derivatives up to second order. They propagate only… read more here.

Keywords: degenerate higher; higher order; tensor; scalar tensor ... See more keywords

Charged scalar-tensor solitons and black holes with (approximate) Anti-de Sitter asymptotics

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recommendations! Published in 2019 at "Journal of High Energy Physics"

DOI: 10.1007/jhep01(2019)142

Abstract: A bstractWe discuss charged and static solutions in a shift-symmetric scalar-tensor gravity model including a negative cosmological constant. The solutions are only approximately Anti-de Sitter (AdS) asymptotically. While spherically symmetric black holes with scalar-tensor hair… read more here.

Keywords: black holes; scalar tensor; anti sitter; tensor solitons ... See more keywords

Stable wormholes in scalar-tensor theories

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recommendations! 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
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Higher dimensional Bianchi type-III string cosmological models with dark energy in Brans-Dicke scalar-tensor theory of gravitation

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recommendations! Published in 2021 at "New Astronomy"

DOI: 10.1016/j.newast.2021.101658

Abstract: Abstract The Five dimensional anisotropic Bianchi type-III cosmological model has been investigated within the framework of Brans-Dicke (Phys. Rev. 124:925, 1961) scalar-tensor theory of gravitation. Dark Energy fluid and cosmic strings are considered as a… read more here.

Keywords: bianchi type; scalar tensor; model; energy ... See more keywords

Exact cosmological black hole solutions in scalar tensor vector gravity

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recommendations! Published in 2019 at "Classical and Quantum Gravity"

DOI: 10.1088/1361-6382/ab55c8

Abstract: We find an exact solution of Scalar-Tensor-Vector Gravity field equations that represents a black hole embedded in an expanding universe. This is the first solution of the kind found in the theory. We analyze the… read more here.

Keywords: scalar tensor; gravity; vector gravity; black hole ... See more keywords

Gravitational waves from quasielliptic compact binaries in scalar-tensor theory to one-and-a-half post-Newtonian order

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recommendations! Published in 2024 at "Classical and Quantum Gravity"

DOI: 10.1088/1361-6382/adedf5

Abstract: The orbit-averaged fluxes of energy and angular momentum generated by a compact binary system of nonspinning particles are obtained in a popular class of massless scalar-tensor theories with first-and-a-half post-Newtonian (1.5PN) accuracy, i.e. 2.5PN accuracy… read more here.

Keywords: scalar tensor; half post; post newtonian; order ... See more keywords

Constraints on scalar and tensor spectra from Neff

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recommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2019/06/007

Abstract: At the linear level, the gravitational wave (GW) spectrum predicted by inflation, and many of its alternatives, can have arbitrarily small amplitude and consequently an unconstrained tilt. However, at second order, tensor fluctuations are sourced… read more here.

Keywords: tensor; tensor spectra; spectrum; scalar spectrum ... See more keywords
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Constraining scalar-tensor modified gravity with gravitational waves and large scale structure surveys

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recommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2021/01/068

Abstract: The first multi-messenger gravitational wave event has had a transformative effect on the space of modified gravity models. In this paper we study the enhanced tests of gravity that are possible with a future set… read more here.

Keywords: large scale; gravitational waves; modified gravity; scalar tensor ... See more keywords

Scalar and tensor perturbations in DHOST bounce cosmology

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recommendations! Published in 2021 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2021/11/045

Abstract: We investigate the bounce realization in the framework of DHOST cosmology, focusing on the relation with observables. We perform a detailed analysis of the scalar and tensor perturbations during the Ekpyrotic contraction phase, the bounce… read more here.

Keywords: phase; tensor perturbations; cosmology; scalar tensor ... See more keywords

Phantom scalar-tensor models and cosmological tensions

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recommendations! Published in 2023 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2023/04/029

Abstract: We study three different extended scalar-tensor theories of gravity by also allowing a negative sign for the kinetic term for the scalar field in the Jordan frame. Our scope is to understand how the observational… read more here.

Keywords: scalar tensor; term; sign kinetic; kinetic term ... See more keywords

Nonlinear gravitational waves in Horndeski gravity: scalar pulse and memories

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recommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2024/05/026

Abstract: We present and analyze a new non-perturbative radiative solution of Horndeski gravity. This exact solution is constructed by a disformal mapping of a seed solution of the shift-symmetric Einstein-Scalar system belonging to the Robinson-Trautman geometry… read more here.

Keywords: radiative solution; seed; scalar tensor; solution ... See more keywords