Magnon inflation: slow roll with steep potentials
Magnon inflation: slow roll with steep potentials
复制标题
磁振子膨胀：缓慢滚动，潜力巨大
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Patil
中科院分区：
文献类型：
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作者：
Peter Adshead;D. Blas;C. Burgess;C. Burgess;P. Hayman;P. Hayman;S. Patil
我们发现多标量有效场论（EFTs），尽管有一个标量势，不满足？ab a V B V V2/Mp2（其中？ab是目标空间度量）。它们避开了V上通常的慢滚条件，因为它们的动能由单导数项而不是通常的二导数项主导。在慢滚过程中，单一的导数占主导地位，因此不需要打破通常的导数展开，而导数展开是宇宙学中计算控制的基础。这些项的存在需要在暴胀期间发生某种紫外洛伦兹对称性破缺（除了通常的宇宙学破缺之外）。色自然暴胀提供了一个特定的例子，紫外线理论，可以产生我们考虑的多场单导数项，我们认为，我们发现的EFT确实捕捉其背景演化的慢卷条件。我们还表明，我们的EFT可以被理解为单场Cuscuton模型的多场推广。多场的情况下引入了一个新的功能，然而：标量动力学项定义了一个目标空间的2-形式，dmab，其反对称提供了新的方式来实现慢滚。
We find multi-scalar effective field theories (EFTs) that can achieve a slow inflationary roll despite having a scalar potential that does not satisfy ?ab ∂a V ∂b V ≪ V2/Mp2 (where ?ab is the target-space metric). They evade the usual slow-roll conditions on V because their kinetic energies are dominated by single-derivative terms rather than the usual two-derivative terms. Single derivatives dominate during slow roll and so do not require a breakdown of the usual derivative expansion that underpins calculational control in much of cosmology. The presence of such terms requires some sort of UV Lorentz-symmetry breaking during inflation (besides the usual cosmological breaking). Chromo-natural inflation provides one particular example of a UV theory that can generate the multi-field single-derivative terms we consider, and we argue that the EFT we find indeed captures the slow-roll conditions for its background evolution. We also show that our EFT can be understood as a multi-field generalization of the single-field Cuscuton models. The multi-field case introduces a new feature, however: the scalar kinetic terms define a target-space 2-form, ℱab, whose antisymmetry gives new ways for slow roll to be achieved.
影响因子：
2.2
作者：
Blas, Diego;Lim, Eugene
通讯作者：
Lim, Eugene