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In models with the fundamental gravity scale in the TeV range, earlycosmology is quite different from the standard picture, because the universemust have arisen at a much lower temperature and the electroweak symmetry wasprobably never restored. In this context, baryogenesis appears to beproblematic: if the involved physics is essentially that of the Standard Model,``conventional'' non-conserving baryon number processes are completelynegligible at such low temperatures. In this paper we show that the observedmatter-antimatter asymmetry of the universe may be generated by gravitationaldecay of TeV-mass particles: such objects can be out of equilibrium afterinflation and, if their mass is of the same order of magnitude as the truequantum gravity scale, they can quickly decay through a black hole intermediatestate, violating global symmetries, in particular, baryon number. In thiscontext, we take advantage of the fact that the ``Sakharov conditions'' forbaryogenesis can be more easily satisfied with a low fundamental scale ofgravity.Comment: 18 pages, added reference

Baryogenesis from gravitational decay of TeV particles in theories with low scale gravity