Results 71 to 80 of about 1,577,801 (299)
Quantum cosmology and tachyons [PDF]
Fortschritte der Physik, 2008 AbstractWe discuss the relevance of the classical and quantum rolling tachyons inflation in the frame of the standard, p‐adic and adelic minisuperspace quantum cosmology. The field theory of tachyon matter proposed by Sen in a zero‐dimensional version suggested by Kar leads to a model of a particle moving in a constant external field with quadratic ...
Dimitrijevic, D. D. +2 more
openaire +2 more sources
Universe, 2022 The hybrid and the dressed metric formalisms for the study of primordial perturbations in Loop Quantum Cosmology lead to dynamical equations for the modes of these perturbations that are of a generalized harmonic-oscillator type, with a mass that depends
Simon Iteanu, Guillermo A. Mena Marugán
doaj +1 more source
Modular quantum cosmology [PDF]
Classical and Quantum Gravity, 1999 Latex, 23 pages, 1 figure.
Bertolami, Orfeu, Schiappa, Ricardo
openaire +3 more sources
Hybrid loop quantum cosmology and predictions for the cosmic microwave background [PDF]
, 2017 We investigate the consequences of the hybrid quantization approach for primordial perturbations in loop quantum cosmology, obtaining predictions for the cosmic microwave background and comparing them with data collected by the Planck mission.
Laura Castell'o Gomar +3 more
semanticscholar +1 more source
The loop quantum cosmology bounce as a Kasner transition [PDF]
, 2017 For the Bianchi type I space-time (vacuum or with a massless scalar field), the loop quantum cosmology bounce can be viewed as a rapid transition between two classical solutions, with a simple transformation rule relating the Kasner exponents of the two ...
E. Wilson-Ewing
semanticscholar +1 more source
Transport properties in the Horndeski holographic two-currents model
European Physical Journal C: Particles and Fields, 2023 The transport features of the holographic two-currents model are investigated in the Horndeski gravity framework. This system displays metallic or insulating characteristics depending on whether the Horndeski coupling parameter $$\gamma $$ γ is negative ...
Dan Zhang +4 more
doaj +1 more source
Observational Exclusion of a Consistent Quantum Cosmology Scenario
, 2015 It is often argued that inflation erases all the information about what took place before it started. Quantum gravity, relevant in the Planck era, seems therefore mostly impossible to probe with cosmological observations.
Barrau, Aurelien +3 more
core +3 more sources
Loop cosmological dynamics and dualities with Randall-Sundrum braneworlds [PDF]
, 2006 The discrete quantum geometric effects play an important role in dynamical evolution in the loop quantum cosmology. These effects which are significant at the high energies lead to the quadratic energy density modifications to the Friedmann equation, as ...
A. Ashtekar +6 more
core +3 more sources
Noncommutative quantum cosmology
Journal of Physics: Conference Series, 2009 Proceedings of DICE2008, Castiglioncello, 22nd-26th September 2008 ...
Bastos, C. +3 more
openaire +2 more sources
Polymer Dynamics of Isotropic Universe in Ashtekar and in Volume Variables
Universe, 2022 We analyze the semiclassical and quantum polymer dynamics of the isotropic Universe in terms of both the standard Ashtekar-Barbero-Immirzi connection and its conjugate momentum and also of the new generalized coordinate conjugate to the Universe volume ...
Eleonora Giovannetti +3 more
doaj +1 more source