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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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Renormalization for a Scalar Field in an External Scalar Potential [PDF]
Symmetry, 2018 The Pauli–Villars regularization procedure confirms and sharpens the conclusions reached previously by covariant point splitting. The divergences in the stress tensor of a quantized scalar field interacting with a static scalar potential are isolated into a three-parameter local, covariant functional of the background potential.
Stephen Fulling +2 more
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Spontaneous scalarization of a conducting sphere in Maxwell-scalar models [PDF]
Phys. Rev. D 103, 044019 (2021), 2020 We study the spontaneous scalarization of a standard conducting charged sphere embedded in Maxwell-scalar models in flat spacetime, wherein the scalar field $\phi$ is nonminimally coupled to the Maxwell electrodynamics. This setup serves as a toy model for the spontaneous scalarization of charged (vacuum) black holes in Einstein-Maxwell-scalar ...
arxiv +1 more source
Scalarized Einstein-Born-Infeld-scalar Black Holes [PDF]
Phys. Rev. D 103, 104012 (2021), 2020 The phenomenon of spontaneous scalarization of Reissner-Nordstr\"{o}m (RN) black holes has recently been found in an Einstein-Maxwell-scalar (EMS) model due to a non-minimal coupling between the scalar and Maxwell fields. Non-linear electrodynamics, e.g., Born-Infeld (BI) electrodynamics, generalizes Maxwell's theory in the strong field regime.
arxiv +1 more source
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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Physics Letters B, 2018 Nous obtenons un sous-groupe du groupe d'isométrie de pAdS (une version p-adique de AdS alternative à l'arbre Bruhat–Tits). Nous proposons un candidat pour l'action en vrac scalaire et l'équation de mouvement sur pAdS, et élaborons des expressions analytiques des fonctions du Vert pour un choix particulier de paramètre avec un ansatz pour les cas ...
Feng Qu, Yi-hong Gao
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Scalarly charged particles and interparticle interaction with the Higgs potential [PDF]
Gravitat. Cosmol. 29 (2023) 213, 2023 Asymptotically exact solutions are obtained for a spherically symmetric field with the Higgs potential generated by a point scalar charge, and a method for numerical integration of the equation for a scalar field with the Higgs potential of a point charge is proposed. Examples of numerical modeling of the equation of the scalar field of a single charge
arxiv +1 more source
Quantum imploding scalar fields [PDF]
Royal Society Open Science, 2018 The d’Alembertian □ ϕ = 0 has the solution ϕ = f ( v )/ r , where f is a function of a null coordinate v , and this allows creation of a divergent singularity out of nothing.
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Scalar field dark matter and the Higgs field [PDF]
Physics Letters B, 2016 8 pages, 2 figures, 1 appendix. Version to match the one published at Physics Letters B759, 1-8 (2016)
Orfeu Bertolami +3 more
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Dissipation dynamics of a scalar field
Physical Review D, 2023 We investigate the dissipation rate of a scalar field in the vicinity of the phase transition and the ordered phase, specifically within the universality class of model A. This dissipation rate holds significant physical relevance, particularly in the context of interpreting effective potentials as inputs for dynamical transport simulations, such as ...
Laura Batini +2 more
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