Reheating a multi-throat universe by brane motion.pdf

Reheating a multi-throat universe by brane motion.pdf

  1. 1、本文档共15页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
Reheating a multi-throat universe by brane motion

a r X i v : 0 7 0 6 .3 2 1 4 v 2 [ h e p - t h ] 3 J u l 2 0 0 7 UTAP-580, RESCEU-72/07 Reheating a multi-throat universe by brane motion Shinji Mukohyama Department of Physics and Research Center for the Early Universe, The University of Tokyo, Tokyo 113-0033, Japan Abstract We propose a mechanism of reheating after inflation in multi-throat scenar- ios of warped extra dimensions. Validity of an effective field theory on the standard model (SM) brane requires that the position of the SM brane dur- ing inflation be different from the position long after inflation, i.e. the tip of the SM throat. After inflation, when the Hubble expansion rate becomes sufficiently low, the SM brane starts moving towards the tip and eventually oscillates. The SM fields are excited by the brane motion and the universe is reheated. We consider a U(1) gauge field on a wrapped D5-brane as a toy model to illustrate that fields confined to a brane are indeed excited by brane motion. Since interaction is suppressed only by the local string scale, the modulus corresponding to the brane position effectively decays into the SM fields. 1 Introduction Our universe appears to have many mass scales, including the Planck scale, the electroweak scale, the scale of inflation, the scale of cosmic expansion today, etc. One of the most outstanding problems in theoretical physics is, hence, to explain how hierarchies among those scales emerge in a natural way. The 5-dimensional braneworld scenario proposed by Randall and Sundrum gen- erates the large hierarchy between the Planck scale and the electroweak scale by a warped 5th dimension [1]. Although their original scenario does not recover the ordinary 4-dimensional Einstein gravity at low energy on the brane confining the standard model (SM) of particle physics, this flaw was fixed by inclusion of a moduli stabilization mechanism [2]. Moduli stabilization is important not only for the Randall-Sundrum scenario but also for any models with extra dim

文档评论(0)

l215322 + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档