Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-10-25
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 1 figure
Scientific paper
It is an interesting question whether low energy degrees of freedom may be responsible for early universe inflation. To examine this, here we present a simple version of Higgs-inflation with minimal coupling to gravity and a quadratic inflationary potential. This quantitatively differs from the popular non-minimally coupled models, although it is qualitatively similar. In all such models, new heavy fields must enter in order for the theory to be well behaved in the UV. We show that in all cases the Higgs self coupling lambda must be quite small in order to integrate out the heavy fields at tree level and use the resulting low energy effective field theory of the Higgs to describe inflation. For moderately sized lambda, the UV completion is required and will, in general, determine the inflationary regime. We discuss the important issue of the arbitrariness of the Lagrangians used in all these setups by presenting a new class of such models, including a supergravity version. This suggests that the inflationary potential is somewhat disconnected from low energy physics.
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