Results 31 to 40 of about 17,761 (262)
Cosmology in a supersymmetric model with gauged $B-L$ [PDF]
, 2007 We consider salient cosmological features of a supersymmetric model which is Left-Right symmetric and therefore possessing gauged $B-L$ symmetry. The requirement of breaking parity and also obtaining charge preserving vacua introduces some unique ...
Anjishnu Sarkar +4 more
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Physics Letters B, 2016 The coupling between spin and torsion in the Einstein–Cartan–Sciama–Kibble theory of gravity generates gravitational repulsion at very high densities, which prevents a singularity in a black hole and may create there a new universe.
Shantanu Desai, Nikodem J. Popławski
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Kinetic Inflation in Stringy and Other Cosmologies [PDF]
, 1994 An inflationary epoch driven by the kinetic energy density in a dynamical Planck mass is studied. In the conformally related Einstein frame it is easiest to see the demands of successful inflation cannot be satisfied by kinetic inflation alone. Viewed in
A.H. Guth +15 more
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Dark Energy: The Shadowy Reflection of Dark Matter?
Entropy, 2016 In this article, we review a series of recent theoretical results regarding a conventional approach to the dark energy (DE) concept. This approach is distinguished among others for its simplicity and its physical relevance.
Kostas Kleidis, Nikolaos K. Spyrou
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The Cosmological Slingshot Scenario: a Stringy Proposal for the Early Time Cosmology [PDF]
, 2008 In the Cosmological Slingshot Scenario, our Universe is a D3-brane that extends in the 4d noncompact directions of a warped Calabi-Yau compactification of IIB Supergravity.
Alex Kehagias +6 more
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Cosmology with Ricci-Flat Compactification [PDF]
Progress of Theoretical Physics Supplement, 1986 La limite theorie du champ des theories de supercorde a 10 dimensions suggere une compactification sur des varietes de Calabi-Yau Ricci-plate a 6 dimensions.
openaire +1 more source
Dynamical Mechanism for Varying Light Velocity as a Solution to Cosmological Problems [PDF]
, 1998 A dynamical model for varying light velocity in cosmology is developed, based on the idea that there are two metrics in spacetime. One metric $g_{\mu\nu}$ describes the standard gravitational vacuum, and the other ${\hat g}_{\mu\nu} =g_{\mu\nu}+\beta ...
Clayton, M. A., Moffat, J. W.
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A Cosmological Version of Flatness Conditions in General Relativity [PDF]
Progress of Theoretical Physics, 1981 Summary: In terms of our cosmological extension of Arnowitt, Deser and Misner's canonical formalism to the Einstein equations [ibid. 65, No. 5, 1613--1620 (1981)], Arnowitt and Deser's flatness conditions in general relativity are reformulated on the simplifying assumption that the empty state without gravitational waves is represented by the de Sitter
Kihara, Masahiro, Nariai, Hidekazu
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Cosmological consequences of supersymmetric flat directions [PDF]
, 2009 In this work we analyze various implications of the presence of large field vacum expectation values (VEVs) along supersymmetric flat directions during the early universe. First, we discuss supersymmetric leptogenesis and the gravitino bound. Supersym- metric thermal leptogenesis with a hierarchical right-handed neutrino mass spectrum normally requires
Francesco Riva
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Inflationary Cosmology: Theory and Phenomenology [PDF]
, 2001 This article gives a brief overview of some of the theory behind the inflationary cosmology, and discusses prospects for constraining inflation using observations.
+18 more
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