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Title: Warm and fuzzy dark matter: Free streaming of wave dark matter

Journal Article · · Physical Review. D.

Wave or fuzzy dark matter that is produced with relativistic wave numbers exhibits free-streaming effects analogous to warm or hot particle dark matter with relativistic momenta. Axions produced after inflation provide such a warm or mildly relativistic candidate, where the enhanced suppression and observational bounds are only moderately stronger than that from wave propagation of initially cold axions. More generally, the free-streaming damping also impacts isocurvature fluctuations from generation in causally disconnected patches. As coherent spatial fluctuations free stream away they leave incoherent and transient superpositions in their wakes. These multiple wave momentum streams are the wave analog of particle phase space fluctuations or directional collisionless damping of massive neutrinos or hot dark matter. The observable impact on both adiabatic and isocurvature fluctuations of fuzzy dark matter can differ from their cold dark matter counterparts due to free streaming depending on how warm or hot is their momentum distribution.

Research Organization:
Chicago U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); University of Chicago, IL (United States)
Sponsoring Organization:
US Department of Energy; USDOE
Grant/Contract Number:
89243024CSC000002; AC02-07CH11359; SC0009924
OSTI ID:
2506938
Report Number(s):
FERMILAB-PUB-24-0296-T
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 2 Vol. 111; ISSN 2470-0010; ISSN 2470-0029
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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