Results 1 to 10 of about 500,941 (94)
Cosmic Inflation and Genetic Algorithms
Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023 Abstract Large classes of standard single‐field slow‐roll inflationary models consistent with the required number of e‐folds, the current bounds on the spectral index of scalar perturbations, the tensor‐to‐scalar ratio, and the scale of inflation can be efficiently constructed using genetic algorithms.
Steve A. Abel +3 more
wiley +1 more source
Mass Hierarchies and Quantum Gravity Constraints in DKMM‐refined KKLT
Fortschritte der Physik, Volume 71, Issue 1, January 2023., 2023 Abstract We carefully revisit the mass hierarchies for the KKLT scenario with an uplift term from an anti D3‐brane in a strongly warped throat. First, we derive the bound resulting from what is usually termed “the throat fitting into the bulk” directly from the Klebanov‐Strassler geometry.
Ralph Blumenhagen +2 more
wiley +1 more source
Quantum Newtonian cosmology revisited [PDF]
Letters in High Energy Physics, LHEP-321, 2022, 2021 We formulate the Lagrangian of the Newtonian cosmology where the cosmological constant is also introduced. Following the affine quantization procedure, the Hamiltonian operator is derived. The wave functions of the Newtonian universe and the corresponding eigenvalues for the case of matter dominated by a negative cosmological constant are given.
arxiv +1 more source
Inflationary spectra and observations in loop quantum cosmology [PDF]
J. Phys.: Conf. Ser. 360 (2012) 012027, 2011 We review some recent progress in the extraction of inflationary observables in loop quantum cosmology. Inverse-volume quantum corrections induce a growth of power in the large-scale cosmological spectra and are constrained by observations.
arxiv +1 more source
Exact Classical Correspondence in Quantum Cosmology [PDF]
Gravitation and Cosmology, 21, 208 (2015), 2014 We find a Friedmann model with appropriate matter/energy density such that the solution of the Wheeler-DeWitt equation exactly corresponds to the classical evolution. The well-known problems in quantum cosmology disappear in the resulting coasting evolution. The exact quantum-classical correspondence is demonstrated with the help of the de Broglie-Bohm
arxiv +1 more source
, 1993 An elementary review of quantum cosmology. (Talk given at Texas/Pascos 1992 at Berkeley)
arxiv +1 more source
The Time Evolution of Quantum Universe in The Quantum Potential Picture [PDF]
Phys.Lett. A245 (1998) 197-202, 1997 We use the quantum potential approach to analyse the quantum cosmological model of the universe. The quantum potential arises from exact solutions of the full Wheeler-De Witt equation.
arxiv +1 more source
Loop quantum modified gravity and its cosmological application [PDF]
Front. Phys., 8, 80 (2013), 2012 A general nonperturvative loop quantization procedure for metric modified gravity is reviewed. As an example, this procedure is applied to scalar-tensor theories of gravity. The quantum kinematical framework of these theories is rigorously constructed.
arxiv +1 more source
Bianchi type-I string cosmological model in the presence of a magnetic field: classical versus loop quantum cosmology approaches [PDF]
Astrophys. Space Sci. 339 (2012) 371-377, 2011 A Bianchi type-I cosmological model in the presence of a magnetic flux along a cosmological string is considered. The first objective of this study is to investigate Einstein equations using a tractable assumption usually accepted in the literature.
arxiv +1 more source
Data‐Driven Review on Aerogels and Polymeric Aerogels
Angewandte Chemie International Edition, Accepted Article.Thoroughly data‐driven review on chemistry–properties–applications of aerogels is provided. Aerogel is a category of solid materials having homogeneous, highly porous nanostructures. Unique physicochemical properties of aerogels have attracted much attention in wide fields due to their potentials for energy/environmental issues in the 21st century ...
Satoru Takeshita +2 more
wiley +1 more source