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Abstract
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We consider the imbalance of matter and antimatter
by using a gravitational baryogenesis mechanism in the
background of Dvali–Gabadadze–Porrati (DGP) brane cosmology.
By taking into account a flat Friedmann–Lemaître–
Robertson–Walker (FLRW) metric in the DGP brane model,
we find that for a radiation dominated universe, w = 1/3, the
ratio of baryon number density to entropy from the gravitational
baryogenesis is not zero, contrary to ordinary general
relativity. Also, we study the ratio of baryon number density
to entropy against the observational constraints in DGP
cosmology.
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