Monday, October 22, 2007

Higgs as the inflaton

Bezrukov and Shaposhnikov argue that they have revived "economical" models where the inflaton is represented by the Higgs boson: the Standard Model would be enough to inflate. They do so by including the "Higgs squared times Ricci scalar" term with an intermediate dimensionless coefficient between 1 and 10^{17}, in order to avoid problems with cosmology as well as particle physics.

At the quantum level, it is not clear what the rules of the games exactly are because we are adding a higher-dimension operator (two dimensions higher than the Einstein-Hilbert term whose non-trivial part is already non-renormalizable) but classically, we should check them because if it were possible, such a Standard Model inflation would be more predictive than general inflation.

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