Results 11 to 20 of about 48,355 (157)

Inflation and Fractional Quantum Cosmology

Fractal and Fractional, 2022
The Wheeler–DeWitt equation for a flat and compact Friedmann–Lemaître–Robertson–Walker cosmology at the pre-inflation epoch is studied in the contexts of the standard and fractional quantum cosmology.
Seyed Meraj Mousavi Rasouli, Emanuel W. de Oliveira Costa, Paulo Moniz, Shahram Jalalzadeh   +3 more
doaj   +5 more sources

Inflation from Supersymmetric Quantum Cosmology [PDF]

Physical Review D, 1996
We derive a special scalar field potential using the anisotropic Bianchi type I cosmological model from canonical quantum cosmology under determined conditions in the evolution to anisotropic variables $\beta_\pm$.
Delduc, F, Gallot, Laurent, Ivanov, E
core   +6 more sources

Inflation in Multidimensional Quantum Cosmology [PDF]

Physical Review D, 1995
We extend to multidimensional cosmology Vilenkin's prescription of tunnelling from nothing for the quantum origin of the observable Universe. Our model consists of a $D+4$-dimensional spacetime of topology ${\cal R}\times {\cal S}^3 \times{\cal S}^D ...
A. D. Linde, A. D. Linde, A. O. Barvinsky, A. Vilenkin, A. Vilenkin, A. Vilenkin, A. Vilenkin, E. Carugno, E. W. Kolb, Enrico Carugno, F. Lucchin, Franco Occhionero, Giuseppe Pollifrone, J. B. Hartle, J. J. Halliwell, J. Yokoyama, L. Amendola, L. M. Sokołowski, L. M. Sokołowski, M. J. Duff, M. Yoshimura, Marco Litterio, P. Candelas, P. G. O. Freund, S. Del Campo, V. A. Rubakov, Y. B. Zeldovich, Y. Okada, Yu. A. Kubyshin   +28 more
core   +5 more sources

Cosmology without inflation [PDF]

Physical Review D, 2008
We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce.
A. Ashtekar, A. A. Starobinsky, I. B. Zeldovich, Nelson Pinto-Neto, P. R. Holland, Patrick Peter, R. Penrose, V. F. Mukhanov   +7 more
core   +3 more sources

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

The Warm Inflation Story

Universe, 2023
Warm inflation has normalized two ideas in cosmology, that in the early universe the initial primordial density perturbations generally could be of classical rather than quantum origin and that during inflation, particle production from interactions ...
Arjun Berera
doaj   +1 more source

Recent Developments in Warm Inflation

Universe, 2023
Warm inflation, its different particle physics model implementations, and the implications of dissipative particle production for its cosmology are reviewed.
Vahid Kamali, Meysam Motaharfar, Rudnei O. Ramos   +2 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

Relativistic Cosmology with an Introduction to Inflation

Universe, 2021
In this review article, the study of the development of relativistic cosmology and the introduction of inflation in it as an exponentially expanding early phase of the universe is carried out.
Muhammad Zahid Mughal, Iftikhar Ahmad, Juan Luis García Guirao   +2 more
doaj   +1 more source

Inflation and cosmological constant [PDF]

Physica Scripta, 2021
Abstract In construction of an inflationary model, one usually assumes that the matter sector of the gravitational action is minimally coupled to the background. It means that the matter (inflaton) part of the action is coupled with the same metric of the gravitational part.
openaire   +2 more sources