论文标题
从弦模量衰减到阿尔卑斯山的黑暗辐射
On dark radiation from string moduli decay to ALPs
论文作者
论文摘要
我们研究了从弦模量衰减到轴突样颗粒（ALP）的深色辐射（DR）问题。在模量稳定化的KKLT型模型中，预计模量磁场的轴突样相对于在LVS型模量稳定性中解脱出来，有些稳定性可以保持光线，并且可能构成黑暗辐射。我们评估模量衰减至最小的超对称标准模型（MSSM）颗粒和深色辐射，以进行更一般的压缩。尽管在Δn_{eff}上拧紧误差条，但由于大量的MSSM衰减模式，由于有些抑制的模量分支分数有所抑制，因此仅在模量-ALP耦合上发现了轻微的约束。我们预计，如果与最轻的模量磁场相关的ALP确实很轻，那么对Δn_{eff}精确度更高的未来CMB实验仍可能会出现DR的证据。
We examine the issue of dark radiation (DR) from string moduli decay into axion-like particles (ALPs). In KKLT-type models of moduli stabilization, the axionlike phases of moduli fields are expected to decouple whilst in LVS-type moduli stabilization some can remain light and may constitute dark radiation. We evaluate modulus decay to Minimal Supersymmetric Standard Model (MSSM) particles and dark radiation for more general compactifications. In spite of tightening error bars on ΔN_{eff}, we find only mild constraints on modulus-ALP couplings due to the somewhat suppressed modulus branching fraction to DR owing to the large number of MSSM decay modes. We anticipate that future CMB experiments with greater precision on ΔN_{eff} may still turn up evidence for DR if the ALP associated with the lightest modulus field is indeed light.
