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Static and slowly rotating neutron stars in scalar–tensor theory with self-interacting massive scalar field [PDF]

European Physical Journal C: Particles and Fields, 2018
Binary pulsar observations and gravitational wave detections seriously constrained scalar–tensor theories with massless scalar field allowing only small deviations from general relativity.
Kalin V. Staykov, Dimitar Popchev, Daniela D. Doneva, Stoytcho S. Yazadjiev   +3 more
doaj   +4 more sources

Massless and massive scalar shell dynamics from rotating BTZ black holes with nonminimally coupled scalar fields [PDF]

Scientific Reports
This paper is devoted to presenting the dynamics of thin-shell composed of massive and massless scalar fields developed from (2+1)-dimensional rotating black holes with nonminimally coupled scalar fields.
Faisal Javed, Arfa Waseem, G. Mustafa, S. K. Maurya, Mansour Shrahili, Farruh Atamurotov, Mamo Abebe Ashebo   +6 more
doaj   +2 more sources

Dynamics in Interacting Scalar-Torsion Cosmology

Universe, 2021
In a spatially flat Friedmann–Lemaître–Robertson–Walker background space, we consider a scalar-torsion gravitational model which has similar properties to the dilaton theory. This teleparallel model is invariant under a discrete transformation similar to
Andronikos Paliathanasis
doaj   +1 more source

Hyperbolic inflationary model with nonzero curvature

Physics Letters B, 2022
We consider a cosmological model consisting of two scalar fields defined in the hyperbolic plane known as hyperbolic inflation. For the background space, we consider a homogeneous and isotropic spacetime with nonzero curvature.
Andronikos Paliathanasis, Genly Leon
doaj   +1 more source

Generic Three-Parameter Wormhole Solution in Einstein-Scalar Field Theory

Particles, 2021
An exact analytical, spherically symmetric, three-parametric wormhole solution has been found in the Einstein-scalar field theory, which covers the several well-known wormhole solutions.
Bobur Turimov, Ahmadjon Abdujabbarov, Bobomurat Ahmedov, Zdeněk Stuchlík   +3 more
doaj   +1 more source

Duality family of scalar field

Nuclear Physics B, 2021
We show that there exists a duality family of self-interacting massive scalar fields. The scalar fields in a duality family are related by a duality transformation.
Wen-Du Li, Wu-Sheng Dai
doaj   +1 more source

Painlevé Analysis of the Cosmological Field Equations in Weyl Integrable Spacetime

Universe, 2022
We apply a singularity analysis to investigate the integrability properties of the gravitational field equations in Weyl Integrable Spacetime for a spatially flat Friedmann–Lemaître–Robertson–Walker background spacetime induced by an ideal gas.
Andronikos Paliathanasis
doaj   +1 more source

AdS/BCFT with brane-localized scalar field

Journal of High Energy Physics, 2023
In this paper, we study the dynamics of end-of-the-world (EOW) branes in AdS with scalar fields localized on the branes as a new class of gravity duals of CFTs on manifolds with boundaries.
Hiroki Kanda, Masahide Sato, Yu-ki Suzuki, Tadashi Takayanagi, Zixia Wei   +4 more
doaj   +1 more source

Analytical investigations on non-minimally coupled scalar fields outside neutral reflecting shells

European Physical Journal C: Particles and Fields, 2023
We study the existence of scalar fields outside neutral reflecting shells. We consider static massive scalar fields non-minimally coupled to the Gauss–Bonnet invariant.
Yan Peng
doaj   +1 more source

Vacuum Radiation from Massive Scalar Field

Universe, 2022
The vacuum radiation of a massive scalar field is studied by means of a single moving mirror. The field equation with an arbitrary-shaped mirror moving in (d+1) dimensions is given perturbatively in the non-relativistic limit.
Yu-Song Cao
doaj   +1 more source