Composite Inflation from Super Yang-Mills, Orientifold and One-Flavor QCD

Preprint number: CP3-Origins-2012-25 and DIAS-2012-26
Authors: Phongichit Channuie (CP3-Origins & DIAS), Jakob Joergensen (CP3-Origins & DIAS), and Francesco Sannino (CP3-Origins & DIAS)
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Recent investigations have shown that inflation can be driven by four-dimensional strongly coupled theories non-minimally coupled to gravity. We explore this paradigm further by considering as underlying strongly coupled gauge theories for composite inflation orientifold field theories. The advantage of using these theories resides in the fact that at large number of colors they feature certain super Yang-Mills properties. In particular we can use for inflation the bosonic part of the Veneziano-Yankielowicz effective theory. Furthermore we are able to include the 1/N as well as the small fermion mass corrections at the effective Lagrangian level. This allows us to explore the consequences of these corrections on the inflationary slow-roll parameters. Additionally the orientifold field theory with fermionic matter transforming according to the two-index antisymmetric representation for three colors is QCD. Therefore this model can be interpreted as a new non-minimally coupled QCD theory of inflation. The scale of composite inflation, for all the models presented here, is of the order of 1016 GeV. Unitarity studies of the inflaton scattering suggest that the cutoff of the model is at the Planck scale.