Gauged M-flation, its UV sensitivity and spectator species
2011 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 6, 014- p.Article in journal (Refereed) Published
In this paper we study gauged M-flation. an inflationary model in which inflation is driven by three N x N scalar field matrices in the adjoint representation of U(N) gauge group. We focus our study on the gauged M-flation model which could be derived front the dynamics of a stack of D3-branes in appropriate background flux. The background inflationary dynamics is unaltered compared to the ungauged case of , while the spectrum of "spectator species", the isocurvature modes, differs from the ungauged case. Presence of a large number of spectators, although irrelevant to the slow-roll inflationary dynamics, has been argued to lower the effective UV cutoff Lambda of the theory from the Planck mass M-pl, putting into question the main advantage of M-flation in not having super-Planckian field values and unnaturally small couplings. Through a careful analysis of the spectrum of the spectators we argue that contrary to what happens in N-flation models, M-flation is still UV safe with the modified (reduced) effective UV cutoff Lambda, which we show to be of order (0.5 - 1) x 10(-1)M(pl). Moreover, we argue that the string scale in our gauged M-flation model is larger than Lambda by a factor of 10 and hence one can also neglect stringy effects. We also comment on the stability of classical inflationary paths in the gauged M-flation.
Place, publisher, year, edition, pages
2011. no 6, 014- p.
inflation, string theory and cosmology, gravity, quantum black holes
IdentifiersURN: urn:nbn:se:uu:diva-156240DOI: 10.1088/1475-7516/2011/06/014ISI: 000292332400014OAI: oai:DiVA.org:uu-156240DiVA: diva2:431399