Search Results - "Barrow, John. D."

The area of a rough black hole by Barrow, John D.

“…We investigate the consequences for the black hole area of introducing fractal structure for the horizon geometry. We create a three-dimensional spherical…”
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Friedmann-like universes with torsion by Kranas, Dimitrios, Tsagas, Christos G., Barrow, John D., Iosifidis, Damianos

“…We consider spatially homogeneous and isotropic cosmologies with non-vanishing torsion, which assumes a specific form due to the high symmetry of these…”
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Szekeres universes with homogeneous scalar fields by Barrow, John D., Paliathanasis, Andronikos

“…We consider the existence of an “inflaton” described by an homogeneous scalar field in the Szekeres cosmological metric. The gravitational field equations are…”
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Dynamical analysis in scalar field cosmology by Paliathanasis, Andronikos, Tsamparlis, Michael, Basilakos, Spyros, Barrow, John D.

“…We give a general method to find exact cosmological solutions for scalar-field dark energy in the presence of perfect fluids. We use the existence of invariant…”
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Dynamics of Einstein–Aether scalar field cosmology by Paliathanasis, Andronikos, Papagiannopoulos, G., Basilakos, Spyros, Barrow, John D.

“…We study the cosmological evolution of the field equations in the context of Einstein–Aether cosmology by including a scalar field in a spatially flat…”
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Two-fluid solutions of particle-creation cosmologies by Pan, Supriya, Barrow, John D., Paliathanasis, Andronikos

“…Cosmological evolution driven incorporating continuous particle creation by the time-varying gravitational field is investigated. We consider a spatially flat,…”
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Friedmann-like universes with weak torsion: a dynamical system approach by Barrow, John D., Tsagas, Christos G., Fanaras, Georgios

“…We consider Friedmann-like universes with torsion and take a step towards studying their stability. In so doing, we apply dynamical-system techniques to an…”
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Inflation without a trace of lambda by Barrow, John D., Cotsakis, Spiros

“…We generalise Einstein’s formulation of the traceless Einstein equations to f ( R ) gravity theories. In the case of the vacuum traceless Einstein equations,…”
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Non-linear interactions in cosmologies with energy exchange by Barrow, John D., Kittou, Georgia

“…We investigate the case of two interacting fluids in homogeneous and isotropic cosmologies with a non-linear interaction term. The interaction term avoids the…”
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Cyclic Szekeres universes by Barrow, John D., Paliathanasis, Andronikos

“…We consider the Szekeres universe with an inhomogeneous dust fluid and a homogeneous and isotropic ghost matter source with equation of state p g = ( γ - 1 ) ρ…”
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Cosmological singularities and analytical solutions in varying vacuum cosmologies by Basilakos, Spyros, Paliathanasis, Andronikos, Barrow, John D., Papagiannopoulos, G.

“…We investigate the dynamical features of a large family of running vacuum cosmologies for which Λ evolves as a polynomial in the Hubble parameter…”
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Inhomogeneous spacetimes in Weyl integrable geometry with matter source by Paliathanasis, Andronikos, Leon, Genly, Barrow, John D.

“…We investigate the existence of inhomogeneous exact solutions in Weyl Integrable theory with a matter source. In particular, we consider the existence of a…”
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Einstein-aether theory in Weyl integrable geometry by Paliathanasis, Andronikos, Leon, Genly, Barrow, John D.

“…We study the Einstein-aether theory in Weyl integrable geometry. The scalar field which defines the Weyl affine connection is introduced in the gravitational…”
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The generic sudden singularity in Brans–Dicke theory by Barrow, John D., Cotsakis, Spiros, Trachilis, Dimitrios

“…We construct a formal asymptotic series expansion for a general solution of the Brans–Dicke equations with a fluid source near a sudden singularity. This…”
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New solution of the cosmological constant problems by Barrow, John D, Shaw, Douglas J

“…We extend the usual gravitational action principle by promoting the bare cosmological constant (CC) to a field which can take many possible values. Variation…”
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Observational constraints on dual intermediate inflation by Barrow, John D., Lagos, Macarena, Magueijo, João

“…We explore the observational implications of models of intermediate inflation driven by modified dispersion relations, specifically those representing the…”
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Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra by Berengut, J C, Flambaum, V V, Ong, A, Webb, J K, Barrow, John D, Barstow, M A, Preval, S P, Holberg, J B

“…We propose a new probe of the dependence of the fine-structure constant α on a strong gravitational field using metal lines in the spectra of white-dwarf…”
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Four direct measurements of the fine-structure constant 13 billion years ago by Wilczynska, Michael R, Webb, John K, Bainbridge, Matthew, Barrow, John D, Bosman, Sarah E I, Carswell, Robert F, Dąbrowski, Mariusz P, Dumont, Vincent, Lee, Chung-Chi, Leite, Ana Catarina, Leszczyńska, Katarzyna, Liske, Jochen, Marosek, Konrad, Martins, Carlos J A P, Milaković, Dinko, Molaro, Paolo, Pasquini, Luca

“…Observations of the redshift = 7.085 quasar J1120+0641 are used to search for variations of the fine structure constant, a, over the redshift range 5:5 to 7:1…”
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On the effects of coupled scalar fields on structure formation by Li, Baojiu, Barrow, John D.

“…A coupling between a scalar field (representing the dark energy) and dark matter could produce rich phenomena in cosmology. It affects cosmic structure…”
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Big Bang Nucleosynthesis constraints on Barrow entropy by Barrow, John D., Basilakos, Spyros, Saridakis, Emmanuel N.

“…We use Big Bang Nucleosynthesis (BBN) data in order to impose constraints on the exponent of Barrow entropy. The latter is an extended entropy relation arising…”
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