Decay of ultralight axion condensates

作者：Eby Joshua^*; Ma Michael; Suranyi Peter; Wijewardhana L C R

来源：The Journal of High Energy Physics, 2018, 2018(1): 066.

DOI：10.1007/JHEP01(2018)066

• Classical Theories of Gravity
• Cosmology of Theories beyond the SM

Axion particles can form macroscopic condensates, whose size can be galactic in scale for models with very small axion masses m similar to 10(-22) eV, and which are sometimes referred to under the name of Fuzzy Dark Matter. Many analyses of these condensates are done in the non-interacting limit, due to the weakness of the self-interaction coupling of axions. We investigate here how certain results change upon inclusion of these interactions, finding a decreased maximum mass and a modified mass-radius relationship. Further, these condensates are, in general, unstable to decay through number-changing interactions. We analyze the stability of galaxy-sized condensates of axion-like particles, and sketch the parameter space of stable con fi gurations as a function of a binding energy parameter. We find a strong lower bound on the size of Fuzzy Dark Matter condensates which are stable to decay, with lifetimes longer than the age of the universe.

• 出版日期2018-1-15