Enlarging the space of viable inflation models: A slingshot mechanism
AffiliationUniv Arizona, Dept Phys
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationDienes, K. R., Kost, J., & Thomas, B. (2019). Enlarging the space of viable inflation models: A slingshot mechanism. Physical Review D, 100(8), 083516.
JournalPHYSICAL REVIEW D
RightsPublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
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AbstractThe viability of a given model for inflation is determined not only by the form of the inflaton potential, but also by the initial inflaton field configuration. In many models, field configurations which are otherwise well-motivated nevertheless fail to induce inflation, or fail to produce an inflationary epoch of duration sufficient to solve the horizon and flatness problems. In this paper, we propose a mechanism which enables inflation to occur even with such initial conditions. Our mechanism involves multiple scalar fields which experience a time-dependent mixing. This in turn leads to a “re-overdamping” phase as well as a parametric resonance which together “slingshot” the inflaton field from regions of parameter space that do not induce inflation to regions that do. Our mechanism is flexible, dynamical, and capable of yielding an inflationary epoch of sufficiently long duration. This slingshot mechanism can therefore be utilized in a variety of settings and thereby enlarge the space of potentially viable inflation models.
NoteOpen access article
VersionFinal published version
SponsorsU.S. Department of EnergyUnited States Department of Energy (DOE) [DE-FG02-13ER41976 (DE-SC0009913)]; U.S. National Science Foundation through its employee IR/D program; Institute for Basic Science in Korea [IBS-R018-D1]; National Science FoundationNational Science Foundation (NSF) [PHY-1607611, PHY-1720430]