Results 31 to 40 of about 193,127 (291)

MULTIVERSE COSMOLOGICAL MODELS

Modern Physics Letters A, 2004
Recent advances in string theory and inflationary cosmology have led to a surge of interest in the possible existence of an ensemble of cosmic regions, or "universes", among the members of which key physical parameters, such as the masses of elementary particles and the coupling constants, might assume different values.
openaire   +2 more sources

Rip Cosmology via Inhomogeneous Fluid

Galaxies, 2013
The conditions for the appearance of the Little Rip, Pseudo Rip and Quasi Rip universes in the terms of the parameters in the equation of state of some dark fluid are investigated. Several examples of the Rip cosmologies are investigated.
Alexander V. Timoshkin, Valerii V. Obukhov, Evgenii V. Savushkin   +2 more
doaj   +1 more source

Covariant entropy conjecture and concordance cosmological models

, 2008
Recently a covariant entropy conjecture has been proposed for dynamical horizons. We apply this conjecture to concordance cosmological models, namely, those cosmological models filled with perfect fluids, in the presence of a positive cosmological ...
Ashtekar A, Bousso R, Bousso R, Bousso R, Gao S, He S, He S, Hongbao Zhang, Hooft G’ t, Rideout D, Song He, Wald R M   +11 more
core   +1 more source

Post-Newtonian cosmological modelling [PDF]

Physical Review D, 2015
22 pages, 5 figures, v2: Published version, v4: Corrections to published ...
Sanghai, VAA, Clifton, T
openaire   +3 more sources

Noether symmetries and analytical solutions in f(T)-cosmology: A complete study

, 2013
We investigate the main features of the flat Friedmann-Lema{\i}tre-Robertson-Walker cosmological models in the f(T) teleparallel gravity. In particular, a general approach to find out exact cosmological solutions in f (T) gravity is discussed. Instead of
A. Einstein, A. Einstein, A. Paliathanasis, H. Ibragimov, H. Stephani, K. Izumi, M. De Laurentis, M. Havelkova, M. Tsamparlis, P. J. Olver, P. J. E. Peebles, S. Basilakos, S. Capozziello, S. Capozziello, Y. Fujii   +14 more
core   +1 more source

Cosmological solutions, p-branes and the Wheeler-DeWitt equation [PDF]

, 1997
The low energy effective actions which arise from string theory or M-theory are considered in the cosmological context, where the graviton, dilaton and antisymmetric tensor field strengths depend only on time.
A. A. Kehagias, A. A. Tseytlin, A. Anderson, A. Lukas, A. Lyons, B. Campbell, C. N. Pope, E. Copeland, E. J. Copeland, F. Larsen, G. W. Gibbons, H. Lü, H. Lü, H. Lü, H. Lü, H. Lü, J. Barrow, J. Maharana, J. Maharana, K. Behrndt, M. Gasperini, M. Gasperini, N. Kaloper, R. Brandenberger, R. Brustein, R. Poppe, S. Mukherji, S. Mukherji   +27 more
core   +2 more sources

Photon‐Sphere Modes in Curved Optical Microcavities: A Black‐Hole Analogue Laser

Advanced Science, EarlyView.
An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Chenni Xu, Aswathy Sundaresan, Nazire‐Begüm Kazkal, Clement Lafargue, Lior Zarfaty, Li‐Gang Wang, Ofek Birnholtz, Dominique Decanini, Melanie Lebental, Patrick Sebbah   +9 more
wiley   +1 more source

The BINGO/ABDUS Project: Forecast for Cosmological Parameters from a Mock Fast Radio Burst Survey

The Astrophysical Journal
There are various surveys that will provide excellent data to search for and localize fast radio bursts (FRBs). The BINGO project will be one such survey, and this collaboration has already estimated an FRB detection rate that the project will yield.
Xue Zhang, Yu Sang, Gabriel A. Hoerning, Filipe B. Abdalla, Elcio Abdalla, Amilcar Queiroz, André A. Costa, Ricardo G. Landim, Chang Feng, Bin Wang, Marcelo V. dos Santos, Thyrso Villela, Carlos A. Wuensche, Jiajun Zhang, Edmar C. Gurjão, Alessandro Marins, Alexandre J. R. Serres, Linfeng Xiao   +17 more
doaj   +1 more source

Multidimensional cosmological models: cosmological and astrophysical implications and constraints

, 2003
We investigate four-dimensional effective theories which are obtained by dimensional reduction of multidimensional cosmological models with factorizable geometry and consider the interaction between conformal excitations of the internal space ...
A. A. Starobinsky, A. A. Starobinsky, A. Cohen, A. D. Dolgov, A. D. Sakharov, A. Salam, A. Starobinsky, A. V. Ivanchik, A. Zhuk, A. Zhuk, A. Zhuk, B. de Carlos, B. Ratra, C. D. Hoyle, D. A. Demir, D. D. Sokolov, D. D. Sokolov, D. N. Spergel, D. S. Gorbunov, E. Kolb, E. W. Kolb, E. W. Kolb, F. Acceta, G. Coughlan, H. B. Sandvik, I. Antoniadis, I. Navarro, J. Cline, J. D. Barrow, J. D. Bekenstein, J. D. Bekenstein, J. Ellis, J. Geddes, J. K. Webb, J. M. Cline, J. Magueijo, J. Scherk, J.-P. Uzan, L. Kofman, L. Kofman, L. Perivolaropoulos, L. Perivolaropoulos, L. Randall, L. Randall, L. Wang, M. Gasperini, M. Gasperini, M. Kaplinghat, M. Lachieze-Rey, M. Nagano, M. Rainer, N. Arkani-Hamed, N. Arkani-Hamed, N. Arkani-Hamed, N. Arkani-Hamed, P. Candelas, P. G. O. Freund, P. J. E. Peebles, S. Hannestad, S. M. Carroll, S. M. Carroll, S. Nasri, T. Banks, T. Banks, T. Banks, T. Banks, T. Boehm, T. Bringmann, T. Damour, T. Moroi, U. Bleyer, U. Bleyer, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Günther, U. Kasper, V. A. Rubakov, V. R. Gavrilov, V. Sahni, Y. Fujii, Y. Morisawa, Yu. N. Gnedin, Yu. N. Gnedin, Yu. N. Gnedin   +89 more
core   +1 more source

Collapse Models and Cosmology [PDF]

, 2020
minor typo in equation (30) corrected, conclusions and results ...
Martin, Jérôme, Vennin, Vincent
openaire   +3 more sources