We have recently pointed out [1] that the string swampland conjectures [2], if true, provide important constraints on dark energy models. The constraints apply to the field range of a scalar field Φ described by an e...We have recently pointed out [1] that the string swampland conjectures [2], if true, provide important constraints on dark energy models. The constraints apply to the field range of a scalar field Φ described by an effective field theory, and to the slope of the potential Ⅴ of such fields.展开更多
We study reheating in some one and two field realizations of fibre inflation.We find that reheating begins with a phase of preheating in which long wavelength fluctuation modes are excited.In two field models there is...We study reheating in some one and two field realizations of fibre inflation.We find that reheating begins with a phase of preheating in which long wavelength fluctuation modes are excited.In two field models there is a danger that the parametric amplification of infrared fluctuations in the second scalar field-associated with an entropy mode-might induce an instability of the curvature fluctuations.We show that,at least in the models we consider,the entropy mode has a sufficiently large mass to prevent this instability.Hence,from the point of view of reheating the models we consider are well-behaved.展开更多
基金supported by the Funding from the European Research Council(ERC)under the European Unions Horizon 2020 Research and Innovation Program(Grant No.801781)the Swiss National Science Foundation(Grant No.1797400)+1 种基金an NSERC Discovery Grantthe Canada Research Chair Program
文摘We have recently pointed out [1] that the string swampland conjectures [2], if true, provide important constraints on dark energy models. The constraints apply to the field range of a scalar field Φ described by an effective field theory, and to the slope of the potential Ⅴ of such fields.
基金supported by a scholarship granted by the China Scholarship Council(CSC,201706180072)supported in part by funds from NSERC and from the Canada Research Chairs program
文摘We study reheating in some one and two field realizations of fibre inflation.We find that reheating begins with a phase of preheating in which long wavelength fluctuation modes are excited.In two field models there is a danger that the parametric amplification of infrared fluctuations in the second scalar field-associated with an entropy mode-might induce an instability of the curvature fluctuations.We show that,at least in the models we consider,the entropy mode has a sufficiently large mass to prevent this instability.Hence,from the point of view of reheating the models we consider are well-behaved.
