Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 90 for “"scalar field"”.
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Motion in a scalar field
Light scalar fields emerge as a generic prediction in physics beyond the Standard Model. For example, they arise as new degrees of freedom in modified gravity, as Kaluza-Klein modes from extra compactified dimensions, and as Nambu-Goldstone bosons from spontaneously broken symmetries. Far from …
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Renormalization group analysis of scalar field theories
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Variational procedure for [phi]4-scalar field theory
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.
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Novel effects in self-interacting scalar field dark matter solitons
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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Equilibration of a scalar field theory: a comparison of methods
… techniques that allow for the study of a Quantum Field Theory in an extreme and very dynamical environment.
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Critical dynamics of active phase separation: A scalar field theory approach
… level and transform it into motion. Several field theories have been proposed as continuum descriptions of isotropic systems of self-propelled particles, that are able to reproduce some of the phenomena observed in these systems at particle level, mainly motility-induced phase separation …
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A Lagrangian formulation of a theory of a scalar field superfluid dark matter
… In the fourth chapter we show that a complex scalar field whose dynamics are dictated by such a Lagrangian, models dust in the background universe on cosmological scale. Prior to our calculations, the theory was shown to model dust on cosmological scale and a superfluid on galactic scale in …
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Finite size effects in the thermodynamics of the free scalar field and the interacting SU(3) plasma
… study the thermodynamic properties of the free scalar field and the thermodynamics of the interacting SU(3) plasma when these systems are away from the thermodynamic limit, i.e., at finite volume. In the first part of the thesis, we study the thermodynamic properties of the free scalar field in …
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Aspects of Screened Modified Gravity
… that, under certain specific assumptions, the scalar field is trivial around a black hole. The assumptions going into the no-hair theorem are the absence of external matter and time independence. An astrophysical black hole typically has an accretion disk, so automatically circumvents the …
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The imprint of scalar clouds around Kerr black holes: hairy solutions and weak cosmic censorship
… the Kerr black hole in the presence of a massive scalar field. We investigate the superradiant phenomenon present in this setting - amplified scattering of scalar waves by the black hole given the right conditions on the scalar field's frequency are satisfied. Due to the mass term the spacetime …
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Even Parity Perturbations of the Janis-Newman-Winicour Singularity
… transformations. By calculating the Einstein field equations and the divergence of the stress-energy tensor, one obtains 8 independent radial equations for the first-order metric perturbations and scalar field perturbation. Through a suitable functional transformation, one can determine a …
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Study of the general theories of gravitation: Lovelock-Cartan-Horndeski Gravity
… is to stay in 4 dimensions and include a scalar field so that second-order equations of motion are obtained in the metric and the scalar field, this theory is known as Horndeski’s theory. In this thesis, we explore a step further from this generalized theory by including torsion and …
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Spectator fields and their imprints on the Cosmic Microwave Background
When a subdominant light scalar field ends slow roll during inflation, but well after the Hubble exit of the pivot scales, it may determine the cosmological perturbations. This thesis investigates how such a scalar field, the spectator, may leave its impact on the Cosmic Microwave Background (CMB) …
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Charged scalar fields on Black Hole space-times
… which model the interaction of a charged scalar field with the electromagnetic field originating from the Black Hole charge. The particularity of this model is to putatively admit charged one-ended Black holes with a Cauchy horizon, and thus provides a framework to study simultaneously …
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Isosurface modelling of soft objects in computer graphics.
… the isosurface representation is described. The scalar fields defining the isosurfaces are represented using a scalar field description language, created as part of this research, which is automatically generated from the hierarchical description of the scene. This language has many techniques …
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Quantum Fields on BTZ Black Holes
… thesis we investigate some aspects of Quantum Fields on BTZ black holes in 1+1 and 1+2 dimensions. More specifically, we study how a ground state in AdS spacetime becomes a thermal state when restricted to the exterior region of the BTZ black hole. This ground state is for the quantum linear …
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Charged scalar fields and superconductivity in AdS4/CFT3.
… the energy behaviour of a massive charged scalar field in an Anti de-Sitter-Reissner-Nordström space-time background using the AdS/CFT correspondence. After obtaining the equations of motion for the system I numerically solve for the vacuum expectation values of the energy momentum tensor …
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New aspects of black hole scalarization in alternative theories of gravity
This thesis investigates the spontaneous scalarization of black holes in extended gravity models. We study two scenarios in which a scalar field develops non-trivial configurations (“hair”) around charged black holes. In the first scenario, a charged black hole is subject to both a tachyonic …
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A study of chameleon-photon mixing from pulsars
… is more generally modelled as a quintessence scalar field rolling down a flat potential.
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