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SUMMARY:S-matrix bootstrap bounds on self-interacting dark matter
DTSTART;VALUE=DATE-TIME:20260812T030000Z
DTEND;VALUE=DATE-TIME:20260812T032000Z
DTSTAMP;VALUE=DATE-TIME:20260913T134808Z
UID:indico-contribution-2670@indico.itp.ac.cn
DESCRIPTION:Speakers: Zhuo-Hui Wang (University of Science and Technology 
 of China)\nSelf-interacting dark matter turns the structure of galactic ha
 los into a direct requirement on a low-energy scattering amplitude. We sho
 w that\, for weakly coupled scalar dark matter\, this requirement implies 
 a much stronger mass bound on the dark matter particle than partial-wave u
 nitarity alone. Using analyticity\, crossing symmetry\, locality and parti
 al-wave unitarity\, we compute the maximal allowed threshold amplitude wit
 h a dispersive primal S-matrix bootstrap\, assuming only a weakly coupled 
 EFT below a scale $\\Lambda$ and allowing arbitrary UV particle content ab
 ove $\\Lambda$. For the benchmark self-interaction cross section $\\sigma_
 {\\rm self}=10^{-24}(M/\\mathrm{GeV})\,\\mathrm{cm}^2$\, the mass of a gen
 eric weakly coupled scalar satisfies $M\n\nhttps://indico.itp.ac.cn/event/
 416/contributions/2670/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2670/
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