Consistency of tachyacoustic cosmology with de Sitter swampland conjectures
Consistency of tachyacoustic cosmology with de Sitter swampland conjectures
复制标题
速声宇宙学与德西特沼泽猜想的一致性
DOI:
10.1088/1475-7516/2019/10/038
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发表时间:
2019
影响因子:
6.4
通讯作者:
Kinney, William H.
中科院分区:
文献类型:
--
作者:
Lin, Wei-Chen;Kinney, William H.
Recent studies show that there is tension between the de Sitter swampland conjectures proposed by Obeid, et al. and inflationary cosmology. In this paper, we consider an alternative to inflation," tachyacoustic" cosmology, in light of swampland conjectures. In tachyacoustic models, primordial perturbations are generated by a period of superluminal sound speed instead of accelerating expansion. We show that realizations of tachyacoustic Lagrangians can be consistent with the de Sitter swampland conjectures, and therefore can in principle be consistent with a UV-complete theory. We derive a general condition for models with c S> 1 to be consistent with swampland conjectures.
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