Results 11 to 20 of about 9,742,280 (331)
European Physical Journal C: Particles and Fields, 2018 With a suitable decomposition of its energy-momentum tensor into pressureless matter and a vacuum type term, we investigate the spherical gravitational collapse of a minimally coupled, self-interacting scalar field, showing that it collapses to a ...
Carneiro, S., Fabris, J. C.
core +3 more sources
Stability of a noncanonical scalar field model during cosmological date [PDF]
Advances in High Energy Physics, 2015 Using the non-canonical model of scalar field, the cosmological consequences of a pervasive, self-interacting, homogeneous and rolling scalar field are studied.
Golanbari, T. +3 more
core +4 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
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
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
On Mass Spectra of Primordial Black Holes
Frontiers in Astronomy and Space Sciences, 2021 Evidence for the primordial black holes (PBH) presence in the early Universe renews permanently. New limits on their mass spectrum challenge existing models of PBH formation.
Alexander A. Kirillov +2 more
doaj +1 more source
Dark Matter from Scalar Field Fluctuations. [PDF]
Physical Review Letters, 2019 Dark matter (DM) may have its origin in a pre-big-bang epoch, the cosmic inflation. Here, we consider for the first time a broad class of scenarios where a massive free scalar field unavoidably reaches an equilibrium between its classical and quantum ...
Tommi Tenkanen
semanticscholar +1 more source
Scalar field effects on the orbit of S2 star [PDF]
Monthly notices of the Royal Astronomical Society, 2019 Precise measurements of the S-stars orbiting SgrA* have set strong constraints on the nature of the compact object at the centre of the Milky Way. The presence of a black hole in that region is well established, but its neighbouring environment is ...
A. Amorim +40 more
semanticscholar +1 more source