“School of Physics”
Back to Papers HomeBack to Papers of School of Physics
Paper IPM / P / 9536  


Abstract:  
We propose an inflationary scenario, Mflation, in which inflation is driven by three N×N hermitian matrices Φ_{i}, i=1,2,3. The inflationary potential is
constructed from Φ_{i} and their commutators which is strongly motivated from string theory. We show that one can consistently restrict the classical dynamics to a sector in which the Φ_{i} are proportional to the N×N irreducible representation of SU(2). In this sector our model effectively behaves as an Nflation model with 3 N^{2} number of fields, and therefore removes
the finetunings associated with superPlanckian field and/or unnaturally small couplings in the chaotic type inflationary scenarios. Due to the matrix nature of the inflaton fields these extra 3N^{2}−1 scalar fields also affect the inflationary dynamics. These have the observational effects such as production of entropy (nonadiabatic) perturbations on cosmic microwave background. Moreover, the existence of these other scalars provides us with a natural preheating mechanism and exit from inflation. As the effective inflaton can traverse superPlanckian distances in the field space, the model is capable of producing a considerable amount of gravity waves that can be probed by future CMB polarization
experiments such as PLANCK, QUIET and CMBPOL.
Download TeX format 

back to top 