2013/03/26 by Augusto Sagnotti, A. Sagnotti, Sagnotti, A. · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #gr-qc #hep-ex #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.1303.6685
9 pages, 4 figures. The original version was based on the talk presented at Rencontres de Moriond EW2013, La Thuile, March 2 - 9 2013. The new version is also based on the talks presented at the "Two-day PLANCK Meeting" and at the "18th Claude Itzykson Meeting". It includes some improved plots and a discussion of the possible role of more general branes
openalex publication_date 2013/03/26 · arxiv created 2013/07/09 · arxiv updated 2013/07/10 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
I elaborate on a link between the string--scale breaking of supersymmetry that occurs in a class of superstring models and the onset of inflation. The link rests on spatially flat cosmologies supported by a scalar field driven by an exponential potential. If, as in String Theory, this potential is steep enough, under some assumptions that are spelled out in the text the scalar can only climb up as it emerges from an initial singularity. In the presence of another mild exponential, slow--roll inflation is thus injected during the ensuing descent and definite imprints are left in the CMB power spectrum: the quadrupole is systematically reduced and, depending on the choice of two parameters, an oscillatory behavior can also emerge for low multipoles l < 50, in qualitative agreement with WMAP9 and PLANCK data. The experimentally favored value of the spectral index, ns ~ 0.96, points to a potentially important role for the NS fivebrane, which is unstable in this class of models, in the Early Universe.