期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/05/012
关键词
inflation; string theory and cosmology; supersymmetry and cosmology; CMBR theory
资金
- Scuola Normale Superiore
- INFN
- MIUR-PRIN contract-KHZKRX
- ERC Advanced Investigator Grants [226455, 226371]
- French ANR TAPDMS [ANR-09-JCJC-0146]
- Tokyo Metropolitan University [DC203]
- CEFIPRA/IFCPAR [4104-2]
- [PITN-GA-2009-237920]
- European Research Council (ERC) [226371, 226455] Funding Source: European Research Council (ERC)
- Grants-in-Aid for Scientific Research [24104505] Funding Source: KAKEN
We discuss the implications for cosmic microwave background (CMB) observables, of a class of pre-inflationary dynamics suggested by string models where SUSY is broken due to the presence of D-branes and orientifolds preserving incompatible portions of it. In these models the would-be inflaton is forced to emerge from the initial singularity climbing up a mild exponential potential, until it bounces against a steep exponential potential of brane SUSY breaking scenarios, and as a result the ensuing descent gives rise to an inflationary epoch that begins when the system is still well off its eventual attractor. If a pre-inflationary climbing phase of this type had occurred within 6-7 e-folds of the horizon exit for the largest observable wavelengths, displacement off the attractor and initial-state effects would conspire to suppress power in the primordial scalar spectrum, enhancing it in the tensor spectrum and typically superposing oscillations on both. We investigate these imprints on CMB observables over a range of parameters, examine their statistical significance, and provide a semi-analytic rationale for our results. It is tempting to ascribe at least part of the large-angle anomalies in the CMB to pre-inflationary dynamics of this type.
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