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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
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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 ...
S. Carneiro, J. C. Fabris
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Differences between scalar field and scalar density field solutions [PDF]
Canadian Journal of Physics, 2012 Differences between scalar field and scalar density solutions are explored using a Robertson–Walker (RW) metric, and a nonrelativistic Hamiltonian is derived for a scalar density field in the post-newtonian approximation. The results are compared with those of a scalar field.
Sert I., Pirinççiog˜lu N.
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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
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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
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Journal of Mathematical Physics, 1996 Static spherically symmetric uncoupled scalar space–times have no event horizon and a divergent Kretschmann singularity at the origin of the coordinates. The singularity is always present so that nonstatic solutions have been sought to see if the singularities can develop from an initially singular free space–time.
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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
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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
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Nontrivial directions for scalar fields [PDF]
Physical Review D, 1996 UUencoded LaTex, 15 pages + 3 postscript ...
Halpern, Ken, Huang, Kerson
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A classification of scalar field potentials with cosmological scaling solutions [PDF]
, 1998 An attractive method of obtaining an effective cosmological constant at the present epoch is through the potential energy of a scalar field. Considering models with a perfect fluid and a scalar field, we classify all potentials for which the scalar field
Liddle, Andrew R, Scherrer, Robert J
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