Inflation in string-inspired cosmology and suppression of CMB low multipoles
Inflation in string-inspired cosmology and suppression of CMB low multipoles
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DOI：
10.1088/0264-9381/21/18/011
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发表时间：
2003-12
影响因子：
3.5
通讯作者：
Yun-song Piao;S. Tsujikawa;Xinmin Zhang
中科院分区：
文献类型：
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作者：
Yun-song Piao;S. Tsujikawa;Xinmin Zhang
我们构建了一个弦启发的非奇异宇宙学场景，在这个场景中，通过使用具有轨道紧化的低能弦有效作用，在优雅退出之前将暴胀场推高到势。这为暴胀产生足够数量的电子折叠和在慢滚暴胀期间产生几乎尺度不变的原始密度摄动建立了初始条件。我们的场景提供了一个有趣的可能性来解释低多极的功率谱抑制，这是由于在慢滚膨胀之前存在模量驱动的相位，因此可以在观测到的CMB各向异性中留下额外维度的强烈印记。
We construct a string-inspired nonsingular cosmological scenario in which an inflaton field is driven up the potential before the graceful exit by employing a low-energy string effective action with an orbifold compactification. This sets up an initial condition for the inflaton to lead to a sufficient number of e-foldings and to generate a nearly scale-invariant primordial density perturbation during slow-roll inflation. Our scenario provides an interesting possibility to explain a suppressed power spectrum at low multipoles due to the presence of the modulus-driven phase prior to slow-roll inflation and thus can leave a strong imprint of extra dimensions in observed CMB anisotropies.