arXiv 1401.80632014-01-31hep-thhep-ph

超对称破缺的自发宇称破缺：宇宙学约束

Spontaneous parity breaking with broken supersymmetry : cosmological constraint

Urjit A. Yajnik, Sasmita Mishra, Debasish Borah

备注：: to appear in the proceedings of The 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013). Covers some of the material included in the proceedings of Eleventh Conference on the Intersections of Particle and Nuclear Physics, (CIPANP 2012)

摘要：

统一模型纳入右手中微子在一个对称的方式一般具有宇称对称。如果这是自发打破，它会导致在早期宇宙中形成畴壁，其持久性是不必要的。这种壁的不稳定的一般机制是由跨壁的自由能的差异发出信号的小的压力差。探索这种效应与以唯象学上可接受的方式打破超对称性的效应相结合的可能性是有趣的。在超对称破缺的几种情况下实现这种可能性会导致自发宇称破缺规模的上限，通常远低于大统一理论规模。在所研究的左右对称模型中，上限不高于$10^{11}$ GeV，但低至$10^5$ GeV的尺度是可以接受的。

英文摘要：

Unified models incorporating the right handed neutrino in a symmetric way generically possess parity symmetry. If this is broken spontaneously it results in the formation of domain walls in the early Universe, whose persistence is unwanted. A generic mechanism for destabilisation of such walls is a small pressure difference signalled by difference in the free energy across the walls. It is interesting to explore the possibility of such effects in conjunction with the effects that break supersymmetry in a phenomenologically acceptable way. Realising this possibility in the context of several scenarios of supersymmetry breaking results in an upper bound on the scale of spontaneous parity breaking, often much lower than the GUT scale. In the left-right symmetric models studied, the upper bound is no higher than $10^{11}$GeV but a scale as low as $10^5$GeV is acceptable.

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