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SUMMARY:A Natural Dark Matter–Dark Energy Interaction from Axion–Monop
 ole Dynamics
DTSTART;VALUE=DATE-TIME:20260812T005500Z
DTEND;VALUE=DATE-TIME:20260812T012000Z
DTSTAMP;VALUE=DATE-TIME:20260824T155053Z
UID:indico-contribution-2686@indico.itp.ac.cn
DESCRIPTION:Speakers: Huangyu Xiao (Harvard University and Boston Universi
 ty)\nWe propose a natural framework for interacting dark matter and dark e
 nergy based on axion–monopole dynamics in a dark gauge sector. Dark matt
 er is composed of dark ’t Hooft–Polyakov monopoles\, while dark energy
  is an ultralight axion whose coupling to the dark gauge field induces an 
 axion-dependent dyon mass through the Witten effect. This generates a dire
 ct dark matter–dark energy interaction. We show that generic models with
  a significant dark matter–dark energy coupling suffer from a naturalnes
 s problem: the Coleman–Weinberg potential induced by the interaction is 
 typically much larger than the dark-energy scale. In our model\, the corre
 ctions arise from a monodromy tower of dyon states\, allowing them to be e
 xponentially suppressed. In the minimal setup\, the interaction strength i
 s predicted to be $\\sim 0.1\\%$\, below the sensitivity of current observ
 ations. We discuss scenarios in which cosmological population of higher-ch
 arge dyons can enhance the interaction to the percent level\, producing an
  apparent phantom dark-energy equation of state.\n\nhttps://indico.itp.ac.
 cn/event/416/contributions/2686/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2686/
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