arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1505.04022hep-phastro-ph.COgr-qchep-th
收藏

三体暴胀中的非热引力子产生

Non-thermal Gravitino Production in Tribrid Inflation

Stefan Antusch, Koushik Dutta

摘要:

我们研究了超引力中三重暴胀后的非热引力子产生,三重暴胀是超对称混合暴胀的一种变体,其中三个场参与了暴胀模型,暴胀子场位于理论的物质部分。与传统的超对称混合暴胀相比,非热引力子的产生对暴胀模型施加了严格的限制,我们发现“非热引力子问题”在三重暴胀模型中一般不存在,主要是由于两个影响:(一)三重暴胀中的暴胀子(在膨胀之后)比瀑布场轻,后者具有第二个衰变通道,其速率比衰变成引力子的速率大得多。这降低了瀑布场衰变为引力子的分支比。(ii)暴胀子的衰变一般比瀑布场晚,并且在衰变时不会产生引力子。这导致瀑布场的衰变对引力子数量的稀释。这两种效应的结合通常会导致三重暴胀中引力子的产生大大减少。

英文摘要:

We investigate non-thermal gravitino production after tribrid inflation in supergravity, which is a variant of supersymmetric hybrid inflation where three fields are involved in the inflationary model and where the inflaton field resides in the matter sector of the theory. In contrast to conventional supersymmetric hybrid inflation, where non-thermal gravitino production imposes severe constraints on the inflationary model, we find that the "non-thermal gravitino problem" is generically absent in models of tribrid inflation, mainly due to two effects: (i) With the inflaton in tribrid inflation (after inflation) being lighter than the waterfall field, the latter has a second decay channel with a much larger rate than for the decay into gravitinos. This reduces the branching ratio for the decay of the waterfall field into gravitinos. (ii) The inflaton generically decays later than the waterfall field, and does not produce gravitinos when it decays. This leads to a dilution of the gravitino population from the decays of the waterfall field. The combination of both effects generically leads to a strongly reduced gravitino production in tribrid inflation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑