Do supernovae favor tachyonic Big Brake instead de Sitter?

Autor: L. Á. Gergely, Z. Keresztes, A. Yu. Kamenshchik, V. Gorini, U. Moschella, Jean-Michel Alimi, André Fuözfa

We investigate whether a tachyonic scalar field, encompassing both dark energy and dark matter-like features will drive our universe towards a Big Brake singularity or a de Sitter expansion. In doing this it is crucial to establish the parameter doma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1570d93c9fd7fc7f563964336860b2a
http://hdl.handle.net/11585/90569

Cosmological Simulations on a Grid of Computers

Autor: Benjamin Depardon, Eddy Caron, Frédéric Desprez, Jérémy Blaizot, Hélène Courtois, Jean-Michel Alimi, André Fuözfa

Publikováno v: [Research Report] RR-7093, Inria. 2009, pp.15
Conference of the Invisible Universe
Conference of the Invisible Universe, Jun 2009, Paris, France. pp.816-825, ⟨10.1063/1.3462722⟩
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The work presented in this paper aims at restricting the input parameter values of the semi-analytical model used in GALICS and MOMAF, so as to derive which parameters influence the most the results, e.g., star formation, feedback and halo recycling

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d45dee47905384486ba3ed609bc20e9
http://arxiv.org/abs/1005.3918

Primordial non-Gaussianity in density fluctuations

Autor: F. Fraschetti, J.-M. Alimi, J. Courtin, P.-S. Corasaniti, Jean-Michel Alimi, André Fuözfa

We present N-body cosmological numerical simulations including a primordial non-Gaussianity in the density fluctuation field quantified by the non-linear parameter $f_{NL}$. We have used MPGRAFIC code to produce initial conditions and the Adaptive Me

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f88bdeb320df7bc239bcaeef255bc6f
http://arxiv.org/abs/1002.0503

Multi-messenger constraints on the annihilating dark matter interpretation of the positron excess

Autor: Miguel Pato, Lidia Pieri, Gianfranco Bertone, Jean-Michel Alimi, André Fuözfa

Publikováno v: AIP Conference Proceedings.

The rise in the energy spectrum of the positron ratio, observed by the PAMELA satellite above 10 GeV, and other cosmic ray measurements, have been interpreted as a possible signature of Dark Matter annihilation in the Galaxy. However, the large numbe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1cc348322c7ec8979627140939256e14
https://doi.org/10.1063/1.3462668

Hawking-like Radiation in a FRW Universe

Autor: Tao Zhu, Ji-Rong Ren, Douglas Singleton, Jean-Michel Alimi, André Fuözfa

Publikováno v: AIP Conference Proceedings.

In this article we study Hawking‐like radiation from a Friedmann‐Robertson‐Walker (FRW) universe using the quasi‐classical WKB/tunneling method. In calculating the correct temperature of the Hawking‐like radiation we emphasize two important

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::66dfdbc8280c621fc9cf78cab595cc4e
https://doi.org/10.1063/1.3462702