arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1102.4333astro-ph.COhep-phhep-th
收藏

伪标量暴胀子的现象学:自然大非高斯性

Phenomenology of a Pseudo-Scalar Inflaton: Naturally Large Nongaussianity

Neil Barnaby, Ryo Namba, Marco Peloso

摘要:

混沌暴胀的许多受控实现都使用了伪标量轴子。伪标量场通过c \tilde{F}自然地耦合到规范场。在这种耦合存在下,规范场量子大量地由滚动暴胀子产生。产生的规范量子,反过来,通过逆衰变的源暴胀子波动。这些新的宇宙学扰动与“真空”扰动不相干地叠加,并且是高度非高斯的。这提供了一个自然的机制,以产生大的非高斯性在单场或多场慢卷膨胀。由此产生的现象学签名是非常独特的:大的非高斯(近)等边形状,除了可检测到的大值的标量谱倾斜和张量标量比(都是典型的大场膨胀)。WMAP对非高斯性的约束意味着赝标暴胀子与任何规范场的耦合c必须小于10^{2} M_p^{-1}。

英文摘要:

Many controlled realizations of chaotic inflation employ pseudo-scalar axions. Pseudo-scalars ϕare naturally coupled to gauge fields through c ϕF \tilde{F}. In the presence of this coupling, gauge field quanta are copiously produced by the rolling inflaton. The produced gauge quanta, in turn, source inflaton fluctuations via inverse decay. These new cosmological perturbations add incoherently with the "vacuum" perturbations, and are highly nongaussian. This provides a natural mechanism to generate large nongaussianity in single or multi field slow-roll inflation. The resulting phenomenological signatures are highly distinctive: large nongaussianity of (nearly) equilateral shape, in addition to detectably large values of both the scalar spectral tilt and tensor-to-scalar ratio (both being typical of large field inflation). The WMAP bound on nongaussianity implies that the coupling, c, of the pseudo-scalar inflaton to any gauge field must be smaller than about 10^{2} M_p^{-1}.

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。

↑