期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/12/040
关键词
alternatives to inflation; inflation; string theory and cosmology
资金
- MINECO [FPA2017-84436-P]
- Xunta de Galicia [ED431C 2017/07, ED481A-2019/115]
- FEDER
- Maria de Maeztu Unit of Excellence [MDM-2016-0692]
- Spanish MECD fellowship [FPU16/06675]
We revisit the recently proposed mechanism of Geometric Inflation. On general grounds, we show that obtaining the right amount of inflation demands an exceedingly large initial energy density. We introduce a scalar field and study the combined action of both mechanisms. Besides fixing the aforementioned issue, a cascading process occurs whose last step seems undistinguishable from ordinary large field inflation. Strikingly, the scalar field remains approximately constant while Geometric Inflation rules the dynamics. This ultimately leads to the possibility of reducing the initial value of the scalar field and its excursion. We discuss the main features of this hybrid scenario.
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