Results 151 to 160 of about 1,577,801 (299)
Unimodular Loop Quantum Cosmology
, 2010 Unimodular gravity is based on a modification of the usual Einstein-Hilbert action that allows one to recover general relativity with a dynamical cosmological constant.
A. Ashtekar +12 more
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A QUANTUM APPROACH TO COSMOLOGY [PDF]
, 2006 We present a theory based upon the treatment of the gravitational field as a sea of gravity quanta, as defined elsewhere. The resultant model for the Universe is a static one, like Einstein first saw, with a new feature: a local shrinking quantum world that completely explains the Hubble red shift under a new point of view.
openaire +2 more sources
New ekpyrotic quantum cosmology
Physics Letters B, 2015 Ekpyrotic instantons describe the emergence of classical contracting universes out of the no-boundary quantum state. However, up to now these instantons ended in a big crunch singularity.
Jean-Luc Lehners
doaj +1 more source
Will quantum cosmology resurrect chaotic inflation model?
, 2016 The single field chaotic inflation model with a monomial power greater than one seems to be ruled out by the recent Planck and WMAP CMB data while Starobinsky model with a higher curvature term seems to be a viable model.
Kim, Sang Pyo, Kim, Won
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Reports in Advances of Physical SciencesThis paper aims to demonstrate that modern cosmology has overlooked the systematic and holistic aspects of the universe’s evolution. It is based on the notion that the primordial universe comprised a two-component quantum superfluid and a synthesis of ...
Xiaodong Yang +3 more
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Gravitational Fluctuations as an Alternative to Inflation II. CMB Angular Power Spectrum
Universe, 2019 Power spectra always play an important role in the theory of inflation. In particular, the ability to reproduce the galaxy matter power spectrum P ( k ) and the CMB temperature angular power spectrum C l ’s to high accuracy is often ...
Herbert W. Hamber, Lu Heng Sunny Yu
doaj +1 more source
Aspects of Quantum Cosmology [PDF]
, 1995 Quantum mechanics may be formulated as SENSIBLE QUANTUM MECHANICS (SQM) so that it contains nothing probabilistic, except, in a certain frequency sense, conscious perceptions.
Page, Don N.
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Quantum cosmology and late-time singularities
, 2013 The development of dark energy models has stimulated interest to cosmological singularities, which differ from the traditional Big Bang and Big Crunch singularities.
Kamenshchik, A. Yu.
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, 2001 A simple and surprisingly realistic model of the origin of the universe can be developed using the Friedmann equation from general relativity, elementary quantum mechanics, and the experimental values of h, c, G and the proton mass. The model assumes there are N space dimensions (with N > 6) and the potential constraining the radius r of the ...
openaire +3 more sources
Many-Particle Quantum Cosmology [PDF]
, 2007 The Einstein-Friedmann Universe as whole quantum object can be treated as bosonic string mass groundstate, called a tachyon, having negative mass square and a speed more than the speed of light.
Glinka, L. A.
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