Baryon density of the Universe : a trace of a scalar field? Julien Larena * , Jean-Michel Alimi* , Arturo Serna‡ Albert Einstein Century Conference July, 20 th 2005 Paris, Palais de l'Unesco *LUTh, Observatoire de Paris-Meudon, FRANCE ‡Departamiento de física, Universidad Miguel Hernández, Elche, SPAIN
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Baryon density of the Universe : a trace of a scalar field?
Albert Einstein Century Conference July, 20 th 2005 Paris, Palais de l'Unesco. Julien Larena * , Jean-Michel Alimi * , Arturo Serna‡. * LUTh, Observatoire de Paris-Meudon, FRANCE ‡Departamiento de física, Universidad Miguel Hernández, Elche, SPAIN. Baryon density of the Universe : - PowerPoint PPT Presentation
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Baryon density of the Universe :
a trace of a scalar field?Julien Larena* , Jean-Michel Alimi* , Arturo Serna‡
Albert Einstein Century Conference
July, 20th 2005Paris, Palais de l'Unesco
*LUTh, Observatoire de Paris-Meudon, FRANCE‡Departamiento de física, Universidad Miguel Hernández, Elche, SPAIN
Primordial Nucleosynthesis
Synthesis of the lightest elements : D, 3He, 4He and traces of 7Li Energy scale : 10 MeV to a few keV Complex network of nuclear reactions (28 reactions) Standard nuclear physics is supposed to apply Two main parameters :
10 and H(T)
Hubble parameter :Expansion rate
Baryon to photon ratio
Reaction rate : (T, 10)=Cross section (T) × number densities(10,T