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Low-$\ell$ CMB from String-Scale SUSY Breaking?
- Publication Year :
- 2015
-
Abstract
- Models of inflation are instructive playgrounds for supersymmetry breaking in Supergravity and String Theory. In particular, combinations of branes and orientifolds that are not mutually BPS can lead to \emph{brane supersymmetry breaking}, a phenomenon where non--linear realizations are accompanied, in tachyon--free vacua, by the emergence of steep exponential potentials. When combined with milder terms, these exponentials can lead to slow--roll after a fast ascent and a turning point. This leaves behind distinctive patterns of scalar perturbations, where pre--inflationary peaks can lie well apart from an almost scale invariant profile. I review recent attempts to connect these power spectra to the low--$\ell$ CMB, and a corresponding one--parameter extension of $\Lambda$CDM with a low--frequency cut $\Delta$. A detailed likelihood analysis led to $\Delta = (0.351 \pm 0.114) \times 10^{-3} \, \mbox{Mpc}^{-1}$, at $99.4\%$ confidence level, in an extended Galactic mask with $f_{sky}=39\%$, to be compared with a nearby value at $88.5\%$ in the standard Planck 2015 mask with $f_{sky}=94\%$. In these scenarios one would be confronted, in the CMB, with relics of an epoch of deceleration that preceded the onset of slow--roll.<br />Comment: 16 pages, LaTeX, 22 eps figures. Based on the presentations at the International School for Subnuclear Physics, 53rd Course, "The Future of our Physics Including New Frontiers," Erice, June 24 -- July 3 2015, and at "Physics on the Riviera 2015," Sestri Levante, September 16--18 2015
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1509.08204
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1142/S0217732317300014