Cosmological structure formation and soliton phase transition in fuzzy dark matter with axion self-interactions

Author:

Mocz Philip12ORCID,Fialkov Anastasia34ORCID,Vogelsberger Mark5ORCID,Boylan-Kolchin Michael6ORCID,Chavanis Pierre-Henri7ORCID,Amin Mustafa A8ORCID,Bose Sownak9ORCID,Dome Tibor34ORCID,Hernquist Lars10ORCID,Lancaster Lachlan1112ORCID,Notis Matthew1ORCID,Painter Connor6ORCID,Robles Victor H13ORCID,Zavala Jesús14ORCID

Affiliation:

1. Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USA

2. Lawrence Livermore National Laboratory , 4 Ivy Lane, 7000 East Ave, Livermore, CA 94550, USA

3. Institute of Astronomy, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UK

4. Kavli Institute for Cosmology , Madingley Road, Cambridge CB3 0HA, UK

5. Department of Physics, Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA

6. Department of Astronomy, The University of Texas at Austin , 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA

7. Laboratoire de Physique Théorique, Université Paul Sabatier , 118 route de Narbonne, F-31062 Toulouse, France

8. Physics & Astronomy Department, Rice University , Houston, TX 77005-1827, USA

9. Department of Physics, Institute for Computational Cosmology, Durham University , Durham DH1 3LE, UK

10. Harvard-Smithsonian Center for Astrophysics , 60 Garden Street, Cambridge, MA 02138, USA

11. Department of Astronomy, Columbia University , 550 W 120th St, New York, NY 10025, USA

12. Center for Computational Astrophysics, Flatiron Institute , 162 5th Avenue, New York, NY 10010, USA

13. Physics Department, Yale Center for Astronomy and Astrophysics , New Haven, CT 06520, USA

14. Center for Astrophysics and Cosmology, Science Institute, University of Iceland , Dunhagi 5, 107 Reykjavik, Iceland

Abstract

ABSTRACT We investigate cosmological structure formation in fuzzy dark matter (FDM) with the attractive self-interaction (SI) with numerical simulations. Such a SI would arise if the FDM boson were an ultra-light axion, which has a strong CP symmetry-breaking scale (decay constant). Although weak, the attractive SI may be strong enough to counteract the quantum ‘pressure’ and alter structure formation. We find in our simulations that the SI can enhance small-scale structure formation, and soliton cores above a critical mass undergo a phase transition, transforming from dilute to dense solitons.

Funder

NASA

NSF

Space Telescope Science Institute

UKRI

Science and Technology Facilities Council

National Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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