Results 81 to 90 of about 1,833,333 (166)

Statefinder diagnosis and the interacting ghost model of dark energy

, 2012
A new model of dark energy namely "ghost dark energy model" has recently been suggested to interpret the positive acceleration of cosmic expansion. The energy density of ghost dark energy is proportional to the hubble parameter.
A. Anisimov, A. Khodam-Mohammadi, A. Khodam-Mohammadi, A. Rozas-Fernandez, A. Sen, A. Sheykhi, A. Sheykhi, A. Sheykhi, A. Sheykhi, A. Sheykhi, A. Sheykhi, A.G. Riess, A.K.D. Evans, B. Feng, B. Ratra, B.R. Chang, C. Armendáriz-Picón, C. Armendáriz-Picón, C. Feng, C. Rosenzweig, C. Wetterich, C.L. Bennett, D. Huterer, D.N. Spergel, D.N. Spergel, E. Elizalde, E. Gaztanaga, E. Witten, E.N. Saridakis, F. Karolyhazy, F. Karolyhazy, F. Karolyhazy, F. Piazza, F.R. Klinkhamer, F.R. Klinkhamer, F.R. Klinkhamer, F.R. Urban, F.R. Urban, F.R. Urban, F.R. Urban, G. Veneziano, H. Wei, H. Wei, I. Brevik, J.D. Barrow, J.D. Barrow, K. Kawarabayashi, K. Kawarabayashi, L. Susskind, L. Zhang, L.P. Chimento, M. Gasperini, M. Malekjani, M. Malekjani, M. Malekjani, M. Malekjani, M. Malekjani, M. Szydlowski, M. Tegmark, M.R. Setare, M.R. Setare, M.R. Setare, M.R. Setare, M.R. Setare, M.R. Setare, M.R. Setare, N. Arkani-Hamed, N. Ohta, N. Ohta, O. Bertolami, O. Gron, P. Horava, P. Horava, P. Nath, R. Amanullah, R. Schutzhold, R.G. Cai, R.R. Caldwell, S. Capozziello, S. Nojiri, S. Nojiri, S. Nojiri, S. Nojiri, S. Perlmutter, S. Thomas, S. Weinberg, S.W. Allen, T. Chiba, T. Padmanabhan, T. Padmanabhan, U. Alam, U. Alam, U. Seljak, V. Gorini, V. Sahni, W. Zhao, W. Zimdahl, W. Zimdahl, W.J. Percival, X. Zhang, X. Zhang, Y. Shao, Y.B. Zeldovich   +102 more
core   +1 more source

Addressing the high-f problem in pseudo-Nambu–Goldstone boson dark energy models with dark matter–dark energy interaction

European Physical Journal C: Particles and Fields, 2020
We consider a dark energy scenario driven by a scalar field $$\phi $$ ϕ with a pseudo-Nambu–Goldstone boson (pNGB) type potential $$V(\phi )=\mu ^4 \left( 1+ \mathrm{cos}(\phi /f) \right) $$ V ( ϕ ) = μ 4 1 + cos ( ϕ / f ) .
Upala Mukhopadhyay, Avik Paul, Debasish Majumdar   +2 more
doaj   +1 more source

Testing the Cosmic Coincidence Problem and the Nature of Dark Energy

, 2001
Dark energy models which alter the relative scaling behavior of dark energy and matter could provide a natural solution to the cosmic coincidence problem - why the densities of dark energy and dark matter are comparable today. A generalized class of dark
A. E. Lange, A. G. Riess, Aneesh V. Manohar, C. Alcock, C. S. Kochanek, C. Wetterich, D. P. Schneider, Elizabeth Jenkins, I. Zlatev, J. A. Frieman, J. A. Newman, J. Peacock, Kevork Abazajian, L. Hui, N. A. Bahcall, Neal Dalal, P. de Bernardis, P. G. Ferreira, P. J. E. Peebles, P. J. E. Peebles, P. McDonald, R. R. Caldwell, S. Perlmutter, S. Perlmutter, S. Weinberg, V. R. Eke, X. Fan   +26 more
core   +1 more source

Hořava–Lifshitz dark energy [PDF]

The European Physical Journal C, 2010
17 pages, no figures, version published at ...
openaire   +3 more sources

Generation of realistic input parameters for simulating atmospheric point-spread functions at astronomical observatories

The Open Journal of Astrophysics
High-fidelity simulated astronomical images are an important tool in developing and measuring the performance of image-processing algorithms, particularly for high precision measurements of cosmic shear -- correlated distortions of images of distant ...
Claire-Alice Hébert, Joshua E. Meyers, My H. Do, Patricia R. Burchat, LSST Dark Energy Science Collaboration   +4 more
doaj   +1 more source

Halo Mass Functions in Early Dark Energy Cosmologies

, 2008
We examine the linear density contrast at collapse time, $\delta_c$ for large-scale structure in dynamical dark energy cosmologies, including models with early dark energy.
Bartelmann, Bartelmann, Basilakos, Borgani, Cole, Cooray, Doran, Doran, Dutta, Eric V. Linder, Evrard, Fedeli, Francis, Geraint F. Lewis, Jenkins, Klypin, Komatsu, Kowalski, Linder, Mainini, Mainini, Manera, Matthew J. Francis, Perlmutter, Press, Riess, Sheth, Tauber, Warren, Wetterich   +29 more
core   +1 more source

DARK ENERGY IN PRACTICE [PDF]

International Journal of Modern Physics A, 2010
In this paper we review a part of the approaches that have been considered to explain the extraordinary discovery of the late time acceleration of the Universe. We discuss the arguments that have led physicists and astronomers to accept dark energy as the current preferable candidate to explain the acceleration.
openaire   +4 more sources

Dark Energy: The Shadowy Reflection of Dark Matter?

Entropy, 2016
In this article, we review a series of recent theoretical results regarding a conventional approach to the dark energy (DE) concept. This approach is distinguished among others for its simplicity and its physical relevance.
Kostas Kleidis, Nikolaos K. Spyrou
doaj   +1 more source

Cluster number counts dependence on dark energy inhomogeneities and coupling to dark matter

, 2006
Cluster number counts can be used to test dark energy models. We investigate dark energy candidates which are coupled to dark matter. We analyze the cluster number counts dependence on the amount of dark matter coupled to dark energy.
Amendola, Amendola, Amendola, Annis, Arbey, Bagla, Bahcall, Barreiro, Barrow, Bertolami, Bond, Brax, Brax, Brookfield, Carroll, Carroll, Causse, Clifton, Copeland, D. F. Mota, Damour, Damour, Doran, Dvali, Ellis, Farrar, Ferreira, Freese, Governato, Gross, Haiman, Holden, Horellou, Jassal, Jenkins, Khoury, Khoury, Lacey, Le Delliou, Lima, Lima, Lopes, M. Manera, Ma, Mainini, Maor, Mota, Mota, Mota, Multamaki, Nunes, Padmanabhan, Padmanabhan, Padmanabhan, Perlmutter, Press, Ratra, Ratra, Riess, Riess, Ruhl, Sarkar, Schuecker, Sheth, Solevi, Spergel, Springel, Steinhardt, Steinhardt, Sugiyama, Tocchini-Valentini, Viana, Wang, Wang, Wetterich, Wetterich, Wetterich, Zehavi, Zlatev   +78 more
core   +3 more sources

Unification of Dark Energy and Dark Matter

, 2005
We propose a scenario in which dark energy and dark matter are described in a unified manner. The ultralight pseudo-Nambu-Goldstone (pNG) boson, A, naturally explains the observed magnitude of dark energy, while the bosonic supersymmetry partner of the ...
Amendola, Arbey, Asaka, Asaka, Beacom, Bento, Bi, Bilic, Boehm, Caldwell, Ferrer, Frampton, Fuminobu Takahashi, Gunion, Hashiba, Hooper, Hooper, Ibe, Ibe, Ichikawa, Jean, Jean, Jeong, Kamenshchik, Kasuya, Kasuya, Kawasaki, Kawasaki, Kawasaki, Kawasaki, Kim, Knodlseder, Knodlseder, Lyth, Mainini, Navarro, Nomura, Oaknin, Padmanabhan, Perlmutter, Picciotto, Ratra, Riess, Serpico, Stewart, T.T. Yanagida, Weinberg, Wetterich   +47 more
core   +3 more sources