Results 1 to 10 of about 17,519 (197)

A new kind of cyclic universe

Physics Letters B, 2019
Combining intervals of ekpyrotic (ultra-slow) contraction with a (non-singular) classical bounce naturally leads to a novel cyclic theory of the universe in which the Hubble parameter, energy density and temperature oscillate periodically, but the scale ...
Anna Ijjas, Paul J. Steinhardt
doaj   +3 more sources

Topics in Cosmology—Clearly Explained by Means of Simple Examples

Universe, 2022
This is a very comprehensible review of some key issues in modern cosmology. Simple mathematical examples and analogies are used, whenever available. The starting point is the well-known Big Bang cosmology (BBC).
Jaume de Haro, Emilio Elizalde
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

Cosmology and fundamental physics with the Euclid satellite [PDF]

Living Reviews in Relativity, 2018
Luca Amendola, Stephen Appleby, Anastasios Avgoustidis   +2 more
exaly   +2 more sources

Analytical Solution to FRW Metric with Variable Speed of Light

Indonesian Journal of Applied Physics, 2021
According to the principle of general covariance, the laws of physics are the same in all reference frames. The controversial theory of the Varying Speed of Light (VSL) contradicts the principle of general covariance.
Gabriel W. Joseph, Terkaa Victor Targema, M. O. Kanu   +2 more
doaj   +1 more source

Entangled Dual Universe

Physical Sciences Forum, 2023
Advances in cosmology and astronomical observations have brought to light significant tensions and uncertainties within the current model of cosmology, which assumes a spatially flat Universe and is known as the ΛCDM model.
Mohammed B. Al-Fadhli
doaj   +1 more source

From Fractional Quantum Mechanics to Quantum Cosmology: An Overture

Mathematics, 2020
Fractional calculus is a couple of centuries old, but its development has been less embraced and it was only within the last century that a program of applications for physics started. Regarding quantum physics, it has been only in the previous decade or
Paulo Vargas Moniz, Shahram Jalalzadeh
doaj   +1 more source

Holographic cosmology solutions of problems with pre-inflationary cosmology

Journal of High Energy Physics, 2020
In this paper we describe in detail how to solve the problems of pre-inflationary cosmology within the holographic cosmology model of McFadden and Skenderis [1].
Horatiu Nastase
doaj   +1 more source

Dynamical Solutions to the Horizon and Flatness Problems [PDF]

, 1993
We discuss in some detail the requirements on an early-Universe model that solves the horizon and flatness problems during the epoch of classical cosmology ($t\ge t_i\gg 10^{-43}\sec$).
A. A. Starobinskii, A. A. Starobinskii, A. D. Linde, A. H. Guth, A. Zee, D. La, E. W. Kolb, E. W. Kolb, Erick J. Weinberg, G. Steigman, J. D. Barrow, J. J. Levin, L. Abbott, L. Jensen, M. A. H. MacCallum, M. S. Turner, M. S. Turner, M. V. Fischetti, Michael S. Turner, P. Anderson, R. H. Dicke, R. Penrose, V. A. Belinski, Yue Hu   +23 more
core   +3 more sources

Brane World Cosmologies with Varying Speed of Light [PDF]

, 2001
We study cosmologies in the Randall-Sundrum models, incorporating the possibility of time-varying speed of light and Newton's constant. The cosmologies with varying speed of light (VSL) were proposed by Moffat and by Albrecht and Magueijo as an ...
A. Albrecht, A. Albrecht, A. Balbi, A. D. Linde, A. H. Guth, C. Csaki, C. Csaki, D. Ida, D. J. Chung, Donam Youm, E. E. Flanagan, E. Kiritsis, G. Kalbermann, H. Ishihara, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. D. Barrow, J. D. Bekenstein, J. K. Webb, J. Lykken, J. M. Cline, J. M. Cline, J. Magueijo, J. W. Moffat, L. Randall, L. Randall, M. A. Clayton, M. A. Clayton, N. Arkani-Hamed, P. Binetruy, P. Binetruy, P. de Bernardis, P. P. Avelino, S. H. Alexander, S. Hanany, S. Kachru, S. Mukohyama, S. Mukohyama, S. S. Stepanov, W. D. Goldberger, W. D. Goldberger, W. D. Goldberger   +42 more
core   +2 more sources