Results 91 to 100 of about 1,088 (220)
Cosmological 3-brane solutions [PDF]
Physics Letters B, 1999 We analyze cosmological equations in the brane world scenario with one extra space-like dimension. We demonstrate that the cosmological equations can be reduced to the usual 4D Friedmann type if the bulk energy-momentum tensor is different from zero. We then generalize these equations to the case of a brane of finite thickness. We also demonstrate that
Keith A. Olive +3 more
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Physics Letters BIn this paper, we investigate pure geometric f(R) cosmology branes embedded in five-dimensional spacetime. The form of f(R) is chosen as a polynomial. The Five-dimensional scalar curvature R is assumed to be constant.
Heng Guo +4 more
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A worldsheet description of instant folded strings
Journal of High Energy Physics, 2023 Time-like linear dilaton backgrounds admit a classical solution that describes a closed folded string that is created at an instant. We refer to such strings as Instant Folded Strings (IFS).
Akikazu Hashimoto +2 more
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BRANE UNIVERSES AND THE COSMOLOGICAL CONSTANT [PDF]
Modern Physics Letters A, 2005 The cosmological constant problem and brane universes are reviewed briefly. We discuss how the cosmological constant problem manifests itself in various scenarios for brane universes. We review attempts — and their difficulties — that aim at a solution of the cosmological constant problem.
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Dirichlet baths and the not-so-fine-grained Page curve
Journal of High Energy Physics, 2021 We present a doubly holographic prescription for computing entanglement entropy on a gravitating brane. It involves a Ryu-Takayanagi surface with a Dirichlet anchoring condition.
Kausik Ghosh, Chethan Krishnan
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Doubly-gauge-invariant formalism of brane-world cosmological perturbations [PDF]
, 2022 Shinji Mukohyama
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Shedding light on dark bubble cosmology
Journal of High Energy PhysicsDark bubble cosmology is an alternative paradigm to compactification, which can circumvent issues of moduli stabilization and scale separation. In this paper we investigate how electromagnetic fields can be incorporated in this framework.
Ivano Basile +3 more
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Aspects of string phenomenology in particle physics and cosmology
EPJ Web of Conferences, 2017 I discuss possible connections between several scales in particle physics and cosmology, such the the electroweak, inflation, dark energy and Planck scales. In particular, I discuss the physics of extra dimensions and low scale gravity that are motivated
Antoniadis I.
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Stability of Fluctating Baby-Skyrme Brane [PDF]
ITM Web of ConferencesThis work studies the stability of fluctuating Baby-Skyrme brane as a model for early-time cosmology recently introduced in [1]. The dynamical system consists of two dynamical quantities (ϕ, H) with two differential equations and one constraint.
Fadhilla Emir S. +3 more
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Brane-world and loop cosmology from a gravity–matter coupling perspective
Physics Letters B, 2015 We show that the effective brane-world and the loop quantum cosmology background expansion histories can be reproduced from a modified gravity perspective in terms of an f(R) gravity action plus a g(R) term non-minimally coupled with the matter ...
Gonzalo J. Olmo, D. Rubiera-Garcia
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