Results 21 to 30 of about 676,684 (291)
On the Energy-Momentum Tensor of the Scalar Field in Scalar--Tensor Theories of Gravity [PDF]
, 1999 We study the dynamical description of gravity, the appropriate definition of the scalar field energy-momentum tensor, and the interrelation between them in scalar-tensor theories of gravity.
Alexander S. Silbergleit +11 more
core +2 more sources
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
Quantization of Einstein-aether scalar field cosmology
European Physical Journal C: Particles and Fields, 2021 We present, for the first time, the quantization process for the Einstein-aether scalar field cosmology. We consider a cosmological theory proposed as a Lorentz violating inflationary model, where the aether and scalar fields interact through the ...
N. Dimakis +5 more
doaj +1 more source
New scalar field quartessence [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 Comment: 6 ...
Brandenberger, Robert +3 more
openaire +2 more sources
Analytic solutions in Einstein-aether scalar field cosmology
European Physical Journal C: Particles and Fields, 2020 In the context of Einstein-aether scalar field cosmology we solve the field equations and determine exact and analytic solutions. In particular, we consider a model proposed by Kanno and Soda where the aether and the scalar fields interact through the ...
Andronikos Paliathanasis, Genly Leon
doaj +1 more source
Universe, 2023 We discuss the problem of the quantization and dynamic evolution of a scalar free field in the interior of a Schwarzschild black hole. A unitary approach to the dynamics of the quantized field is proposed: a time-dependent Hamiltonian governing the ...
Pawel Gusin +5 more
doaj +1 more source
Tachyons, scalar fields, and cosmology [PDF]
Physical Review D, 2004 We study the role that tachyon fields may play in cosmology as compared to the well-established use of minimally coupled scalar fields. We first elaborate on a kind of correspondence existing between tachyons and minimally coupled scalar fields; corresponding theories give rise to the same cosmological evolution for a particular choice of the initial ...
V. Gorini +3 more
openaire +3 more sources
A late time acceleration of the universe with two scalar fields : many possibilities [PDF]
, 2006 In the present work, an attempt has been made to explain the recent cosmic acceleration with two mutually interacting scalar fields, one being the Brans-Dicke scalar field and the other a quintessence scalar field.
Coles P. +5 more
core +2 more sources
Scalar field dark matter and the Higgs field
Physics Letters B, 2016 We discuss the possibility that dark matter corresponds to an oscillating scalar field coupled to the Higgs boson. We argue that the initial field amplitude should generically be of the order of the Hubble parameter during inflation, as a result of its ...
O. Bertolami +2 more
doaj +1 more source
Nontrivial directions for scalar fields [PDF]
Physical Review D, 1996 UUencoded LaTex, 15 pages + 3 postscript ...
Halpern, Ken, Huang, Kerson
openaire +3 more sources