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Abstract: Mirror world, a parallel hidden sector with microphysics identical toordinary particle physics, can have several interesting phenomenological andastrophysical implications and mirror matter can be a natural candidate fordark matter in the universe. In this thesis we analyze in detail some of itsimplications in cosmology, in particular at the primordial nucleosynthesisepoch. Big Bang Nucleosynthesis limits require that the temperature T- of themirror world should be at least twice lower than that of the ordinary world T.We present numerical calculations regarding the nucleosynthesis epoch andcalculate the light and heavier element abundances in both ordinary and mirrorworlds as a function of x=T-T. While the mirror world should be essentiallyHelium dominated, we show that the heavier elements primordial abundances inmirror world can be significantly higher than in the ordinary world. We alsostudy the cosmological bounds on the kinetic mixing between the photon andmirror photon which in fact renders the mirror particles -millicharged- withrespect to the ordinary photon, with small electric charges proportional to thephoton kinetic mixing parameter. These bounds are important regarding thepossibility of mirror dark matter detection in the DAMA-Libra experiment. ThisDiploma Thesis was defended in the University of L-Aquila in October 2007.



Autor: Angela Lepidi

Fuente: https://arxiv.org/







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