CONTRASTING GALAXY FORMATION FROM QUANTUM WAVE DARK MATTER, ψDM, WITH ΛCDM, USING PLANCK AND HUBBLE DATA

By Hsi-Yu Schive, Tzihong Chiueh, T. Broadhurst, Kuan-Wei Huang. 2015

133 citations recorded by the source corpus.

The newly established luminosity functions (LFs) of high-z galaxies at 4 ≲ z ≲ 10 can provide a stringent check on dark matter models that aim to explain the core properties of dwarf galaxies. The cores of dwarf spheroidal galaxies are understood to be too large to be accounted for by free streaming of warm dark matter without overly suppressing the formation of such galaxies. Here we demonstrate with cosmological simulations that wave dark matter, &psgr; DM ?> , appropriate for light bosons such as axions, does not suffer from this problem, given a boson mass of m &psgr; ≥ 1.2 × 10 − 22 eV ?> (2σ). In this case, the halo mass function is suppressed below ∼ 10 10 M ☉ ?> at a level that is consistent with the high-z LFs, while simultaneously generating the kiloparsec-scale cores in dwarf galaxies arising from the solitonic ground state in &psgr; DM ?> . We demonstrate that the reionization history in this scenario is consistent with the Thomson optical depth recently reported by Planck, assuming a reasonable ionizing photon production rate. We predict that the LF should turn over slowly around an intrinsic ultraviolet luminosity of M UV ≳ − 16 ?> at z ≳ 4 ?> . We also show that for galaxies magnified > 10 × ?> in the Hubble Frontier Fields, &psgr; DM ?> predicts an order of magnitude fewer detections than cold dark matter at z ≳ 10 ?> down to M UV ∼ − 15 ?> , allowing us to distinguish between these very different interpretations for the observed coldness of dark matter.

Subfields: Astronomy and Astrophysics, Instrumentation, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/146f798f99211433695e1f7ba34be8d3375d7bf1

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Citations in the corpus

“Non-cold” dark matter at small scales: a general approach (2017, background): “2 [66]) by nearly one order of magnitude.”
Ultralight scalars as cosmological dark matter (2016, background): “However, non-linear numerical computations show that these overdensities fragment, leaving a spectrum of lower mass self-gravitating objects down to the scale given by those two equations, in which the number density of sub-halos is reduced in FDM relative to CDM by a factor ∼ (3M/M1/2) [162].”
CMB-S4 Science Case, Reference Design, and Project Plan (2019, result): “Realizing this sensitivity will require better modeling of the non-linear clustering of axions [315], building upon and applying the results of previous work [316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332].”
The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2 (2018, background): “This theory has had some success with reproducing smaller, but kiloparsec-sized, cores in the classical dwarf galaxies (Schive et al. 2014, 2016).”
Constraining the mass of light bosonic dark matter using SDSS Lyman-α forest (2017, methodology): “This is consistent with arguments from Schive et al. (2016) : simulations with ma ∼ 10−22 eV have shown that the Q term has the most severe impact on the internal structures of DM halos, and much less on larger scales.”