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SUMMARY:Mudit Rai\, TAMU\,  [HET Seminar] Phasing out Dark Matter Isocurva
 ture with Thermal Misalignment
DTSTART:20260827T150000Z
DTEND:20260827T170000Z
DTSTAMP:20261009T141800Z
UID:indico-event-32594@indico.bnl.gov
DESCRIPTION:Thermal misalignment provides an alternative to the standard m
 isalignment mechanism for the cosmological production of scalar dark matte
 r. In this framework\, feeble couplings to particles in the thermal bath g
 enerate a finite-temperature potential that drives the scalar towards larg
 e field values early in the radiation era\, dynamically inducing the misal
 ignment before the onset of scalar oscillations. As a result\, the relic a
 bundance is controlled primarily by particle masses and couplings rather t
 han the initial field value. As a light spectator field\, the scalar acqui
 res inflationary fluctuations that are uncorrelated with the adiabatic cur
 vature mode\, generically sourcing isocurvature perturbations. We show tha
 t\, unlike standard misalignment\, where light scalars are strongly constr
 ained by cosmic microwave background bounds on dark matter isocurvature fo
 r high-scale inflation\, thermal misalignment can naturally suppress the i
 socurvature signal. This occurs through a novel late-time phase offset bet
 ween the background zero mode and the superhorizon perturbations\, which r
 educes the final dark matter density contrast. Thermal misalignment theref
 ore provides a new and generic route to isocurvature-safe scalar dark matt
 er.\nhttps://bnl.zoomgov.com/j/16010362754?pwd=Z1l1SS9JUDlyR1hSUHNyaDV1dTZ
 HUT09 \n\nhttps://indico.bnl.gov/event/32594/
LOCATION:Small Seminar Room
URL:https://indico.bnl.gov/event/32594/
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