Results 121 to 130 of about 2,756,107 (244)
An Issue to the Cosmological Constant Problem [PDF]
arXiv, 2005 According to general relativity, the present analysis shows on geometrical grounds that the cosmological constant problem is an artifact due to the unfounded link of this fundamental constant to vacuum energy density of quantum fluctuations.
arxiv
Towards inhomogeneous loop quantum cosmology: triangulating Bianchi IX with perturbations
, 2010 This brief article sums up results obtained in arXiv:0911.2653, which develops a constrained SU(2) lattice gauge theory in the "dipole" approximation.
Marciano, Antonino
core +1 more source
Aspects of Cosmic Inflation in Expanding Bose-Einstein Condensates
, 2005 Phonons in expanding Bose-Einstein condensates with wavelengths much larger than the healing length behave in the same way as quantum fields within a universe undergoing an accelerated expansion. This analogy facilitates the application of many tools and
Abramowitz M +16 more
core +1 more source
Loop quantum gravity and the CMB: toward pre-Big Bounce cosmology [PDF]
, 2009 This brief article sums up the possible imprints of loop quantum gravity effects on the cosmological microwave background. We focus on semi-classical terms and show that "Big Bounce" corrections, together with the "pre Big Bounce" state, could modify the observed spectrum.
arxiv +1 more source
Quantum suppression of the generic chaotic behavior close to cosmological singularities
, 2004 In classical general relativity, the generic approach to the initial singularity is very complicated as exemplified by the chaos of the Bianchi IX model which displays the generic local evolution close to a singularity.
C. Rovelli +4 more
core +1 more source
Zagadnienia Filozoficzne w Nauce, 2012 The mathematical and cosmological works of a group associated with the Copernicus Center for Interdisciplinary Studies in Cracow are summarized. The group consists mainly of M. Heller, L. Pysiak, W. Sasin, Z. Odrzygóźdź and J. Gruszczak.
Michał Heller
doaj
Darkness without dark matter and energy – generalized unimodular gravity
Physics Letters B, 2017 We suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant ...
A.O. Barvinsky, A.Yu. Kamenshchik
doaj +1 more source
Aspects of Cosmological Relativity [PDF]
Int.J.Theor.Phys. 38 (1999) 1993, 1999 We review cosmological relativity, a new special theory of relativity that was recently developed for cosmology, and discuss in detail some of its aspects.
arxiv
European Physical Journal C: Particles and FieldsThe Moore–Penrose algorithm provides a generalized notion of an inverse, applicable to degenerate matrices. In this paper, we introduce a covariant extension of the Moore–Penrose method that permits to deal with general relativity involving complex non ...
Arthur Garnier, Emmanuele Battista
doaj +1 more source
Physics Letters B, 2022 Parity violating models based on the symmetric teleparallel gravity have been considered in the literature, but their applications in cosmology and especially the features in cosmological perturbations have not been fully explored.
Mingzhe Li, Dehao Zhao
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