微扰层次上的模问题
The moduli problem at the perturbative level
摘要：
如果模场在暴胀过程中保持光态，那么它们在衰变过程中一般会产生强的暗物质辐射和重子辐射等曲率扰动。我们证明了现有的上界的大小，这样的波动，从而可以转化为严格的约束的模参数空间m_σ（模质量）- σ_{inf}（模真空期望值在通货膨胀结束）。这些约束是互补的，以前存在的界限，使模的问题变得更糟的扰动水平。特别是，当暴胀标度H_{inf} ~10^{13} GeV时，预言高模量质量m_σ> 10-100 TeV的粒子物理方案即使避开了大爆炸核合成的约束，也会受到微扰模量问题的困扰。
英文摘要：
Moduli fields generically produce strong dark matter -- radiation and baryon -- radiation isocurvature perturbations through their decay if they remain light during inflation. We show that existing upper bounds on the magnitude of such fluctuations can thus be translated into stringent constraints on the moduli parameter space m_σ(modulus mass) -- σ_{inf} (modulus vacuum expectation value at the end of inflation). These constraints are complementary to previously existing bounds so that the moduli problem becomes worse at the perturbative level. In particular, if the inflationary scale H_{inf}~10^{13} GeV, particle physics scenarios which predict high moduli masses m_σ> 10-100 TeV are plagued by the perturbative moduli problem, even though they evade big-bang nucleosynthesis constraints.
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