Results 31 to 40 of about 388,976 (296)
Constraints of Anisotropy on Warm Power-Law Ination in Light of Planck Results [PDF]
Iranian Journal of Astronomy and Astrophysics, 2021 In this article, we examine the effects of anisotropy on a model of canonical warm inflation with the power-law potential. And we have compared the limitations of this model with Planck's results.
Zahra Ghadiry +2 more
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Anisotropic homogeneous string cosmology with two-loop corrections
Nuclear Physics B, 2017 The two-loop (order α′) β-function equations, which are equivalent to the equations of motion of α′-corrected string effective action, are considered for anisotropic homogeneous space–times.
F. Naderi, A. Rezaei-Aghdam
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Teleparallelism in the algebraic approach to extended geometry
Journal of High Energy Physics, 2022 Extended geometry is based on an underlying tensor hierarchy algebra. We extend the previously considered L ∞ structure of the local symmetries (the diffeomorphisms and their reducibility) to incorporate physical fields, field strengths and Bianchi ...
Martin Cederwall, Jakob Palmkvist
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Proper homothetic vector fields of Bianchi type I spacetimes via Rif tree approach
Results in Physics, 2021 This paper deals with the study of homothetic vector fields of Bianchi type I spacetimes using Rif tree approach. Instead of directly integrating the homothetic symmetry equations, a computer algorithm is used to transform these equations to the reduced ...
Ashfaque H. Bokhari +3 more
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Ugo Bianchi: un essenziale profilo
, 2022 Sulla produzione scientifica di Ugo Bianchi, sulla metodologia storico-comparativa nella storia delle religioni e sulla inventariazione del suo ...
Bianchi L
core
Heliyon, 2019 In this paper, we discuss spatially homogeneous and anisotropic Bianchi type-V dark energy cosmological model in the presence of an attractive massive scalar field in general relativity.
R.L. Naidu, Y. Aditya, D.R.K. Reddy
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Null energy condition violation and classical stability in the Bianchi I metric [PDF]
Physical Review D, 2009 The stability of isotropic cosmological solutions in the Bianchi I model is considered. We prove that the stability of isotropic solutions in the Bianchi I metric for a positive Hubble parameter follows from their stability in the Friedmann-Robertson-Walker metric. This result is applied to models inspired by string field theory, which violate the null
Aref'eva, Irina Ya. +3 more
openaire +2 more sources
COVARIANT INTEGRAL QUANTIZATIONS AND THEIR APPLICATIONS TO QUANTUM COSMOLOGY
Acta Polytechnica, 2016 We present a general formalism for giving a measure space paired with a separable Hilbert space a quantum version based on a normalized positive operator-valued measure.
Jean-Pierre Gazeau
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Casimir force induced by electromagnetic wave polarization in Kerr, Gödel and Bianchi–I spacetimes
European Physical Journal C: Particles and Fields, 2020 Electromagnetic waves propagation on either rotating or anisotropic spacetime backgrounds (such as Kerr and Gödel metrics, or Bianchi–I metric) produce a reduction of the magnitude of Casimir forces between plates.
Felipe A. Asenjo, Sergio A. Hojman
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An Overview on the Nature of the Bounce in LQC and PQM
Universe, 2021 We present a review on some of the basic aspects concerning quantum cosmology in the presence of cut-off physics as it has emerged in the literature during the last fifteen years.
Gabriele Barca +2 more
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