Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.071302
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Funding
- National Science Foundation [PHY-1607611]
- Science Research Council (VR) of Sweden
- Science and Technology Facilities Council (STFC) [ST/R000476/1]
- research project grant Fundamental Physics from Cosmological Surveys - Swedish Research Council (VR) [2017-04212]
- research environment grant Detecting Axion Dark Matter in the Sky and in the Lab (AxionDM) - Swedish Research Council (VR) [2019-02337]
- Research Capital Investment Fund (RCIF) by UK Research and Innovation (UKRI)
- UCL Cosmoparticle Initiative
- Swedish Research Council [2017-04212] Funding Source: Swedish Research Council
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By using the Lyman-alpha forest to search for suppressed cosmic structure growth, we present a new lower limit on the ultralight axion (ULA) dark matter mass m(a): m(a) > 2 x 10(-20) eV. This study strongly disfavors the canonical ULA with mass within the range of 10(-22) eV to 10(-21) eV.
We present a new bound on the ultralight axion (ULA) dark matter mass m(a), using the Lyman-alpha forest to look for suppressed cosmic structure growth: a 95% lower limit m(a) > 2 x 10(-20) eV. This strongly disfavors (>99.7% credibility) the canonical ULA with 10(-22) eV < m(a) < 10(-21) eV, motivated by the string axiverse and solutions to possible tensions in the cold dark matter model. We strengthen previous equivalent bounds by about an order of magnitude. We demonstrate the robustness of our results using an optimized emulator of improved hydrodynamical simulations.
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