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A model for the very early Universe · Around

2008

A model for the very early Universe

Giacosa, Francesco, Hofmann, Ralf, Neubert, Matthias

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A model with N species of massless fermions interacting via (microscopic) gravitational torsion in de Sitter spacetime is investigated in the limit N->infinity.

The U_V(N)*U_A(N) flavor symmetry is broken dynamically irrespective of the (positive) value of the induced four-fermion coupling.
This model is equivalent to a theory with free but massive fermions fluctuating about the chiral condensate.
When the fermions are integrated out in a way demonstrated long ago by Candelas and Raine, the associated gap equation together with the Friedmann equation predict that the Hubble parameter vanishes.

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