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SUMMARY:Theory of interacting vector dark energy and fluid
DTSTART:20241114T070000Z
DTEND:20241114T090000Z
DTSTAMP:20260417T151100Z
UID:indico-event-777@indico.ibs.re.kr
DESCRIPTION:Speakers: Masroor C. Pookkillath\n\nIn this work\, we study th
 e interaction between dark energy and dark matter\, where a massive vector
  field describes dark energy and dark matter is modelled as a fluid. We pr
 esent a new interaction term\, which affects only perturbations and can gi
 ve interesting phenomenology. Then we present a general Lagrangian for the
  interacting vector dark energy with dark matter. For the dark energy\, we
  choose the Proca theory with $G_{3}$ term to study its phenomenological c
 onsequence. For this model\, we explore both background and perturbation d
 ynamics. We also present the no-ghost condition for tensor modes\, vector 
 modes and scalar modes. Subsequently\, we also study the evolution of the 
 overdensities of both baryon and cold dark matter in the high$-k$ limit. W
 e show that the effective gravitational coupling is modified for cold dark
  matter and baryon. We also choose a simple concrete model and numerically
  show suppression in the growth of cold dark matter overdensity. \n\nhttp
 s://indico.ibs.re.kr/event/777/
LOCATION:447-1
URL:https://indico.ibs.re.kr/event/777/
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