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arXiv 0709.2666hep-thastro-phgr-qchep-ph
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旋胀

Spinflation

Damien A. Easson, Ruth Gregory, David F. Mota, Gianmassimo Tasinato, Ivonne Zavala

摘要:

我们研究的宇宙学意义,包括角运动的DBI膜膨胀的情况。狄拉克-玻恩-因菲尔德作用量的非正则动力学项为慢卷暴胀提供了一个有趣的替代方案,循环膜可以驱动宇宙加速膨胀的周期。我们提出了显式的数值解证明膜膨胀在Klebanov-Strassler喉。我们发现,要求足够的通货膨胀发生在喉咙是在冲突保持膜的总能量足够低,使当地的引力反作用的卡-丘流形可以安全地忽略。我们推断自旋暴胀(具有角动量的膜暴胀)可以通过在暴胀开始时提供额外的e-折叠来缓解这种张力。宇宙膨胀迅速地抑制了角动量,导致了一个更传统的膜暴胀场景的退出。最后,我们建立了一个一般的框架,宇宙学扰动理论在这种情况下,我们有多场的非标准动力学项的通货膨胀。

英文摘要:

We study the cosmological implications of including angular motion in the DBI brane inflation scenario. The non-canonical kinetic terms of the Dirac-Born-Infeld action give an interesting alternative to slow roll inflation, and cycling branes can drive periods of accelerated expansion in the Universe. We present explicit numerical solutions demonstrating brane inflation in the Klebanov-Strassler throat. We find that demanding sufficient inflation takes place in the throat is in conflict with keeping the brane's total energy low enough so that local gravitational backreaction on the Calabi-Yau manifold can be safely ignored. We deduce that spinflation (brane inflation with angular momentum) can ease this tension by providing extra e-foldings at the start of inflation. Cosmological expansion rapidly damps the angular momentum causing an exit to a more conventional brane inflation scenario. Finally, we set up a general framework for cosmological perturbation theory in this scenario, where we have multi-field non-standard kinetic term inflation.

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