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arXiv 1606.07889gr-qcastro-ph.COhep-th
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前大爆炸宇宙学中可观测的引力波:更新

Observable gravitational waves in pre-big bang cosmology: an update

M. Gasperini

摘要:

根据最近的结果,关于CMB观测和GW检测,我们解决的问题是,是否有可能,在自洽的通货膨胀框架,同时产生的标量度量扰动的频谱与普朗克数据和原始引力辐射的随机背景兼容的aLIGO/室女座和/或eLISA的设计灵敏度。我们认为,这是可能的弦宇宙学的背景下,为一个广泛的区域的参数空间的所谓的前大爆炸模型。我们还讨论了与CMB偏振实验相关的张量标量比的相关值。我们的结论是,未来,从CMB观测和GW探测器的交叉相关的结果将能够确认或证伪前大爆炸模型,并在任何情况下,将施加新的显着约束的基本弦论/宇宙学参数。

英文摘要:

In the light of the recent results concerning CMB observations and GW detection we address the question of whether it is possible, in a self-consistent inflationary framework, to simultaneously generate a spectrum of scalar metric perturbations in agreement with Planck data and a stochastic background of primordial gravitational radiation compatible with the design sensitivity of aLIGO/Virgo and/or eLISA. We suggest that this is possible in a string cosmology context, for a wide region of the parameter space of the so-called pre-big bang models. We also discuss the associated values of the tensor-to-scalar ratio relevant to the CMB polarization experiments. We conclude that future, cross-correlated results from CMB observations and GW detectors will be able to confirm or disprove pre-big bang models and -- in any case -- will impose new significant constraints on the basic string theory/cosmology parameters.

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