Results 11 to 20 of about 330,022 (192)

Superstring Cosmology [PDF]

Physics Reports, 1999
Aspects of superstring cosmology are reviewed with an emphasis on the cosmological implications of duality symmetries in the theory. The string effective actions are summarized and toroidal compactification to four dimensions reviewed.
Adams, Adams, Alvarez, Appelquist, Bailin, Bardeen, Barrow, Batakis, Belinskii, Belinskii, Belinskii, Belinskii, Bergshoeff, Bergshoeff, Bergshoeff, Bicak, Birrel, Brans, Breitenlohner, Burd, Buscher, Buscher, Callan, Callan, Campbell, Carmeli, Carmeli, Carmeli, Carmeli, Castellani, Chamseddine, Chamseddine, Chapline, Charach, Collins, Collins, Cremmer, Cremmer, Cremmer, Cremmer, Cremmer, Cremmer, Cremmer, Dai, David Wands, de Roo, de Roo, de Roo, Dijkgraaf, Dine, Duff, Duff, Duff, E.J. Copeland, Einstein, Ellis, Ellis, Feinstein, Feinstein, Font, Fradkin, Fradkin, Freund, Freund, Gasperini, Geroch, Giani, Gibbons, Gibbons, Gibbons, Gibbons, Ginsparg, Ginsparg, Giveon, Giveon, Giveon, Gowdy, Gowdy, Green, Green, Green, Green, Green, Green, Griffiths, Gross, Gross, Gross, Guth, Halliwell, Hassan, Hawking, Hewitt, Hoenselaers, Horowitz, Horowitz, Howe, Hughston, James E. Lidsey, Joseph, Julia, Kantowski, Kasner, Kikkawa, King, Kinnersley, Kinnersley, Kinnersley, Kiritsis, Kitchingham, Kodama, Kompanyeets, Kostant, Kramer, Krasinski, Kronberg, Lemoine, Lovelace, Lucchin, M. Bardeen, MacCallum, Maison, Marcus, Marcus, Meissner, Metsaev, Misner, Mueller, Mukhanov, Mukhanov, Mukhanov, Nahm, Narain, Narain, Nepomechie, Neveu, Neveu, O'Raifeartaigh, Oppenheimer, Page, Polchinski, Pollock, Pollock, Pollock, Ramond, Ratra, Ratra, Rey, Ryan, Sakai, Salam, Scherk, Scherk, Scherk, Schwarz, Schwarz, Schwarz, Seiberg, Seiberg, Sen, Sen, Shapere, Shapere, Siklos, Smith, Sneddon, Stewart, Strathdee, Szekeres, Taub, Taub, Teitelboim, Tomita, Tseytlin, Turner, Veneziano, Verdaguer, Vilenkin, Wainwright, Wald, Wald, Wetterich, Yau, York, Zwiebach   +184 more
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The Cosmological Constant [PDF]

Living Reviews in Relativity, 2001
This is a review of the physics and cosmology of the cosmological constant. Focusing on recent developments, I present a pedagogical overview of cosmology in the presence of a cosmological constant, observational constraints on its magnitude, and the ...
Carroll Sean M.
doaj   +6 more sources

Homogeneous cosmologies with a cosmological constant [PDF]

Physical Review D, 1999
Spatially homogeneous cosmological models with a positive cosmological constant are investigated, using dynamical systems methods. We focus on the future evolution of these models. In particular, we address the question whether there are models within this class that are de Sitter-like in the future, but are tilted.
Goliath, Martin, Ellis, George F. R.
openaire   +2 more sources

Nonlocal Cosmology [PDF]

Physical Review Letters, 2007
We explore nonlocally modified models of gravity, inspired by quantum loop corrections, as a mechanism for explaining current cosmic acceleration. These theories enjoy two major advantages: they allow a delayed response to cosmic events, here the transition from radiation to matter dominance, and they avoid the usual level of fine tuning; instead ...
Deser, S., Woodard, R. P.
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TIME IN COSMOLOGY [PDF]

International Journal of Modern Physics D, 1999
The notion of time in cosmology is revealed through an examination of transition matrix elements of radiative processes occurring in the cosmos. To begin with, the very concept of time is delineated in classical physics in terms of correlations between the succession of configurations which describe a process and a standard trajectory called the clock.
Brout, Hyman Robert, Parentani, Renaud
openaire   +5 more sources

SIGNS AND COSMOLOGY [PDF]

International Journal of Modern Physics D, 2012
Using a new effective action predicted from quantum gravity where the sign of the Euclidean Einstein action is reversed, we discuss Wentzel–Kramers–Brillouin (WKB) solutions in quantum cosmology and predict that this sign change might explain the origin of phantom scalars.
Dasgupta, Arundhati, Zampeli, Adamantia
openaire   +2 more sources

Geometrothermodynamic Cosmology

Entropy, 2023
We review the main aspects of geometrothermodynamics, a formalism that uses contact geometry and Riemannian geometry to describe the properties of thermodynamic systems. We show how to handle in a geometric way the invariance of classical thermodynamics with respect to Legendre transformations, which means that the properties of the systems do not ...
Orlando Luongo, Hernando Quevedo
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Bootstrapped Newtonian Cosmology and the Cosmological Constant Problem [PDF]

Symmetry, 2021
Bootstrapped Newtonian gravity was developed with the purpose of estimating the impact of quantum physics in the nonlinear regime of the gravitational interaction, akin to corpuscular models of black holes and inflation. In this work, we set the ground for extending the bootstrapped Newtonian picture to cosmological spaces.
Casadio, Roberto, Giusti, Andrea
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RASTALL COSMOLOGY [PDF]

International Journal of Modern Physics: Conference Series, 2012
We review the difficulties of the generalized Chaplygin gas model to fit observational data, due to the tension between background and perturbative tests. We argue that such issues may be circumvented by means of a self-interacting scalar field representation of the model.
Julio C. Fabris, PIATTELLA O, Davi C. Rodrigues, Carlos E. M. Batista, Mahamadou H. Daouda   +4 more
openaire   +3 more sources

COSMOLOGY IN ISLAM, CONSTRUCTING ISLAMIZATION OF NATURE SCIENCE

Jurnal Al-Dustur, 2022
Cosmology is one of the philosophical and scientific objects that become attention in Greek philosophers, especially Aristotle. However, with the times, this cosmology was found in The Qur’an, exactly in the concept of the sky and earth creation which ...
Muhammad Fiqih Cholidi, Safiya Fadlulah
doaj   +1 more source