2014/11/24 by N. Kitazawa, Noriaki Kitazawa, Kitazawa, N. +3 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Particle physics theoretical and experimental studies #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.48550/arxiv.1411.6396
15 pages, LaTeX, 30 eps figures. To appear in the Proceedings of ICNFP 2014. References added
openalex publication_date 2014/11/24 · arxiv created 2014/12/01 · arxiv updated 2014/12/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
"Brane Supersymmetry Breaking" is a peculiar string-scale mechanism that can unpair Bose and Fermi excitations in orientifold models. It results from the simultaneous presence, in the vacuum, of collections of D-branes and orientifolds that are not mutually BPS, and is closely tied to the scale of string excitations. It also leaves behind, for a mixing of dilaton and internal breathing mode, an exponential potential that is just too steep for a scalar to emerge from the initial singularity while descending it. As a result, in this class of models the scalar can generically bounce off the exponential wall, and this dynamics brings along, in the power spectrum, an infrared depression typically followed by a pre-inflationary peak. We elaborate on a possible link between this type of bounce and the low-ℓ end of the CMB angular power spectrum. For the first 32 multipoles, one can reach a 50 % reduction in χ 2 with respect to the standard ΛCDM setting.