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Kinetically stabilized inflation
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DOI：10.1007/JHEP01(2023)068.png)
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摘要
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In this work, we propose a string-inspired two fields inflation model to address the fine-tuning problem that the standard inflation model suffers. The fast-rolling tachyon T originated from the D-brane and anti-D-brane pair annihilation locks the inflaton ? slowly rolling on a Higgs-like potential V (?) = -m(2)??(2) + lambda?(4) and drives a kinetically stabilized (KS) inflation. Our numerical simulation confirms such a solution is a dynamic attractor. In particular, for lambda < 0.8 x 10(-3), the e-folding number contributed by the KS inflation phase can be larger than 62 to solve the horizon and flatness problems of Big Bang theory. Notably, this KS inflation generates a nearly scale-invariant primordial curvature perturbations spectrum consistent with current cosmic microwave background (CMB) observations. It predicts a low tensor-to-scalar ratio, which the current primordial gravitational wave background (the B-mo des in CMB) searches favor.
Keyword:
Early Universe Particle Physics
Tachyon Condensation
String and Brane Phenomenology
期刊
IF:
5.5
论文数:
4.0W
被引数:
13.7W
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