Matrix inflation and its string theory origins
2010 (English)Conference paper (Refereed)
Motivated by the dynamics of N coincident D3 branes in some specific flux compactifications, we construct an inflationary model in which inflation is driven by three N Oe N hermitian matrices i,i = 1,2, 3, hence the name Matrix Inflation, or M-f lation for short. We show that one can consistently restrict the classical dynamics to a sector in which the i are proportional to the N Oe N irreducible representation of SU(2). In this sector our model behaves like an effective inflaton field, which t akes super-Planckian field values, and 3N(2) -' 1 isocurvature fields. These may have the observational effects such as production of iso-curvature perturbations on cosmic microwave background. Moreover, the existence of these extra scalars provides us wi th a natural preheating mechanism and exit from inflation. Due to the super-Planckian excursions of the canonical effective inflaton, the model is capable of producing a considerable amount of gravity waves that can be probed by future CMB polarization ex periments. Furthermore, the fine-tunings associated with unnaturally small couplings in the chaotic type inflationary scenarios are removed. We also show that even if the cutoff of the theory is lowered by the square of number of species, one can still us e the effective field theory approach to justify the absence of higher dimensional operators.
Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2010.
, Journal of Physics: Conference Series 259, ISSN 1742-6588
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:uu:diva-287821DOI: 10.1088/1742-6596/259/1/012031OAI: oai:DiVA.org:uu-287821DiVA: diva2:923507
16th International Symposium on Particles Strings and Cosmology