Results 51 to 60 of about 405,553 (187)
Loop quantum cosmology: The horizon problem and the probability of inflation [PDF]
, 2015 Anomaly-free perturbations of loop quantum cosmology reveal a deformed space-time structure, in which the signature changes when the energy density isρ = ρc/2.
Long-Bin Chen, Jian-yang Zhu
semanticscholar +1 more source
Statistics of coarse-grained cosmological fields in stochastic inflation [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 We present a generic framework to compute the one-point statistics of cosmological perturbations, when coarse-grained at an arbitrary scale R, in the presence of quantum diffusion. Making use of the stochastic-δ N formalism, we show how it can be related
Y. Tada, V. Vennin
semanticscholar +1 more source
Nearly Forgotten Cosmological Concept of E. B. Gliner
Universe, 2023 E. B. Gliner started his scientific career in 1963 at the age of 40. In 1965, when the existence of the cosmological constant λ seemed unnecessary to most cosmologists, he renewed interest in the problem by emphasizing a material interpretation of de ...
Dmitry Yakovlev, Alexander Kaminker
doaj +1 more source
Cosmology analogues in optical systems [PDF]
EPJ Web of Conferences, 2020 We discuss the possibility of exploiting polariton-exciton physics as an analogue experimental tool to study challenging ideas and existing problems arising in the context of gravity theory and theoretical cosmology.
Howard Eric
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, 2006 These lectures present a brief review of inflationary cosmology, provide an overview of the theory of cosmological perturbations, and then focus on the conceptual problems of the current paradigm of early universe cosmology, thus motivating an ...
Robert Brandenberger +1 more
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Inflationary Cosmology and Quantization Ambiguities in Semi-Classical Loop Quantum Gravity [PDF]
, 2004 In loop quantum gravity, modifications to the geometrical density cause a self-interacting scalar field to accelerate away from a minimum of its potential.
A. Ashtekar +30 more
core +3 more sources
Journal of High Energy Physics, 2021 We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann entropy of subregions. When these are sufficiently large we find that
Sergio E. Aguilar-Gutierrez +4 more
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, 2002 We review the broad status of cosmology and discuss a model of fluctuational cosmology in which the universe is created in a phase transition like phenomenon mimicking inflation, and which further consistently explains latest observations like the ever ...
B.G. Sidharth +28 more
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, 2008 We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce.
A. Ashtekar +7 more
core +2 more sources
Fundamental forces and scalar field dynamics in the early universe
Physics Letters B, 2020 Scalar weak gravity conjectures (SWGCs) attempt to pinpoint the ranges of couplings consistent with a fundamental theory of all interactions. We identify a generic dynamical consequence of these conjectures for cosmology and show that SWGCs imply a ...
Alexander Kusenko +3 more
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