Results 1 to 10 of about 676,684 (291)
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 +3 more
doaj +4 more sources
Scalar perturbations in scalar field quantum cosmology [PDF]
Physical Review D, 2009 In this paper it is shown how to obtain the simplest equations for the Mukhanov-Sasaki variables describing quantum linear scalar perturbations in the case of scalar fields without potential term. This was done through the implementation of canonical transformations at the classical level, and unitary transformations at the quantum level, without ever ...
Falciano, F. T., Pinto-Neto, Nelson
openaire +4 more sources
Massless and massive scalar shell dynamics from rotating BTZ black holes with nonminimally coupled scalar fields [PDF]
Scientific ReportsThis 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 +6 more
doaj +2 more sources
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
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
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 +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 +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