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Title: First Star-Forming Structures in Fuzzy Cosmic Filaments

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2];  [3];  [4];  [5];  [4];  [6];  [7];  [4];  [8];  [9];  [10];  [11]
  1. Princeton Univ., NJ (United States); Rice University
  2. Univ. of Sussex, Brighton (United Kingdom)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  4. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  5. Rice Univ., Houston, TX (United States)
  6. Univ. of Texas, Austin, TX (United States)
  7. Univ. Paul Sabatier, Toulouse (France)
  8. Princeton Univ., NJ (United States)
  9. Univ. of Bologna (Italy)
  10. Univ. of California, Irvine, CA (United States)
  11. Univ. of Iceland, Reykjavik (Iceland)

In hierarchical models of structure formation, the first galaxies form in low-mass dark matter potential wells, probing the behavior of dark matter on kiloparsec scales. Even though these objects are below the detection threshold of current telescopes, future missions will open an observational window into this emergent world. In this Letter, we investigate how the first galaxies are assembled in a “fuzzy” dark matter (FDM) cosmology where dark matter is an ultralight ~10–22 eV boson and the primordial stars are expected to form along dense dark matter filaments. Furthermore, using a first-of-its-kind cosmological hydrodynamical simulation, we explore the interplay between baryonic physics and unique wavelike features inherent to FDM. In our simulation, the dark matter filaments show coherent interference patterns on the boson de Broglie scale and develop cylindrical solitonlike cores, which are unstable under gravity and collapse into kiloparsec-scale spherical solitons. Features of the dark matter distribution are largely unaffected by the baryonic feedback. On the contrary, the distributions of gas and stars, which do form along the entire filament, exhibit central cores imprinted by dark matter—a smoking gun signature of FDM.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
National Science Foundation; USDOE Office of Science (SC)
Grant/Contract Number:
SC0018216
OSTI ID:
1594814
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 123; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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The effect of fluctuating fuzzy axion haloes on stellar dynamics: a stochastic model journal December 2019

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