Results 41 to 50 of about 180,985 (262)

On the emergence of a classical isotropic universe from a quantum f(R) Bianchi cosmology in the Jordan frame

European Physical Journal C: Particles and Fields, 2023
We demonstrate a spontaneous tendency of quantum wave packets to become quasi-classical, providing a classical limit for the Universe dynamics. However, this limit is not maintained in the future (after a critical value of the relational time) and a ...
Mariaveronica De Angelis, Giovanni Montani   +1 more
doaj   +1 more source

Looking inside the Swampland from Warm Inflation: Dissipative Effects in De Sitter Expansion

Universe, 2023
This paper reviews the theoretical and phenomenological implications of the swampland conjectures from the perspective of inflationary cosmology, focusing on warm inflation.
Arjun Berera, Jaime Calderón-Figueroa
doaj   +1 more source

On the initial singularity and extendibility of flat quasi-de Sitter spacetimes

Journal of High Energy Physics, 2023
Inflationary spacetimes have been argued to be past geodesically incomplete in many situations. However, whether the geodesic incompleteness implies the existence of an initial spacetime curvature singularity or whether the spacetime may be extended ...
Ghazal Geshnizjani, Eric Ling, Jerome Quintin   +2 more
doaj   +1 more source

Qualitative dynamics and inflationary attractors in loop cosmology [PDF]

Physical Review D, 2018
Qualitative dynamics of three different loop quantizations of spatially flat isotropic and homogeneous models is studied using effective spacetime description of the underlying quantum geometry.
Bao-Fei Li, Parampreet Singh, Anzhong Wang   +2 more
semanticscholar   +1 more source

INFLATIONARY COSMOLOGY FROM NONCOMMUTATIVE GEOMETRY [PDF]

International Journal of Modern Physics A, 1996
In the framework of the Connes-Lott model based on noncommutative geometry, the basic features of a gauge theory in the presence of gravity are reviewed, in order to show the possible physical relevance of this scheme for inflationary cosmology. These models naturally contain at least two scalar fields, interacting with each other whenever more than ...
LIZZI F, MANGANO G, MIELE, GENNARO, SPARANO G.   +3 more
openaire   +5 more sources

Testing time-delayed cosmology

European Physical Journal C: Particles and Fields, 2022
Inspired by nonlocal gravity theories, time-delayed cosmology proposes a delayed Friedmann equation that generically predicts an inflationary period with a natural end.
C. J. Palpal-latoc, Reginald Christian Bernardo, Ian Vega   +2 more
doaj   +1 more source

A note on initial state entanglement in inflationary cosmology [PDF]

, 2015
We give a new interpretation of the effect of initial state entanglement on the spectrum of vacuum fluctuations. We consider an initially entangled state between two free massive scalar fields in de Sitter space.
S. Kanno
semanticscholar   +1 more source

Inflationary Cosmology after Planck 2013 [PDF]

, 2014
I give a general review of inflationary cosmology and of its present status, in view of the 2013 data release by the Planck satellite. A specific emphasis is given to the new broad class of theories, the cosmological attractors, which have nearly model ...
Andrei Linde
semanticscholar   +1 more source

CHARLES SANDERS PEIRCE AND THE PLACE OF CHAOS IN THE NEW WORLD ORDER [PDF]

Filozofia i Nauka
This article examines the main ideas of the metaphysics of the prominent American logician and philosopher Charles Sanders Peirce. It is shown that a significant part of his „scientific metaphysics” is evolutionary cosmology, characterized, in particular,
Volodymyr Ratnikov
doaj   +1 more source

Early and late universe holographic cosmology from a new generalized entropy

Physics Letters B, 2022
We propose a new four-parameter entropy function that generalizes the Tsallis, Rényi, Barrow, Sharma-Mittal, Kaniadakis and Loop Quantum Gravity entropies for suitable limits of the parameters.
Shin'ichi Nojiri, Sergei D. Odintsov, Tanmoy Paul   +2 more
doaj   +1 more source