Results 1 to 10 of about 49,682 (257)

Constraining barrow entropy-based cosmology with power-law inflation [PDF]

European Physical Journal C: Particles and Fields, 2023
We study the inflationary era of the Universe in a modified cosmological scenario based on the gravity-thermodynamics conjecture with Barrow entropy instead of the usual Bekenstein–Hawking one.
G. G. Luciano
doaj   +4 more sources

Inflation and Fractional Quantum Cosmology [PDF]

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   +4 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   +7 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

Inflation and String Cosmology [PDF]

International Journal of Modern Physics A, 2005
After 25 years of its existence, inflationary theory gradually becomes the standard cosmological paradigm. However, we still do not know which of the many versions of inflationary cosmology will be favored by the future observational data.
Linde, Andrei
core   +5 more sources

Inflation in Gauss-Bonnet Brane Cosmology [PDF]

, 2003
The effect of including a Gauss-Bonnet contribution in the bulk action is investigated within the context of the steep inflationary scenario. When inflation is driven by an exponential inflaton field, this Gauss-Bonnet term allows the spectral index of ...
A. A. Starobinsky, A. A. Starobinsky, A. Albrecht, A. D. Linde, A. D. Linde, A. D. Linde, A. Fayyazuddin, A. H. Guth, A. H. Guth, A. Lukas, A. Lukas, A. Sen, A. Sen, A. Sen, B. Abdesselam, B. Zwiebach, C. Charmousis, C. Cśaki, C. Germani, D. G. Boulware, D. Ida, D. Langlois, D. Wands, E. E. Flanagan, E. F. Bunn, E. F. Bunn, E. I. Guendelman, E. J. Copeland, E. Witten, G. F. Giudice, G. Huey, G. Huey, G. Kofinas, G. T. Horowitz, I. Antoniadis, I. Low, I. P. Neupane, I. P. Neupane, J. E. Kim, J. E. Kim, J. E. Kim, J. E. Kim, J. E. Lidsey, J. E. Lidsey, J. E. Lidsey, J. E. Lidsey, J. M. Bardeen, J. M. Cline, J. M. Maldacena, James E. Lidsey, K. A. Meissner, L. Anchordoqui, L. Randall, L. Randall, M. Gasperini, M. Giovannini, M. Gogberashvili, M. Quevedo, M. Visser, N. Arkani-Hamed, N. Deruelle, N. Deruelle, N. Deruelle, N. E. Mavromatos, N. Goheer, N. J. Nunes, N. J. Nunes, O. Aharony, O. Aharony, O. Corradini, P. Binetruy, P. Binétruy, P. Binétruy, P. Hořava, P. Hořava, P. Kraus, R. C. Myers, R. G. Cai, R. Maartens, R. R. Metsaev, S. C. Davis, S. Gubser, S. Gubser, S. Mukohyama, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. W. Hawking, S. W. Hawking, S. W. Hawking, T. Barreiro, T. Shiromizu, V. A. Rubakov, V. Mukhanov, V. Sahni, Y. M. Cho   +98 more
core   +4 more sources

Effect of inflation on anisotropic cosmologies [PDF]

Physical Review D, 1986
We study the effects of anisotropic cosmologies on inflation. By properly formulating the field equations it is possible to show that any model that undergoes sufficient inflation will become isotropic on scales greater than the horizon today. Furthermore, we shall show that it takes a very long time for anisotropies to become visible in the observable
Lars Gerhard Jensen, Jaime A. Stein‐Schabes   +1 more
openalex   +4 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