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SUMMARY:Contributory: Testing Sub-Horizon Approximations in Interacting Da
 rk-Sector Cosmology
DTSTART;VALUE=DATE-TIME:20261117T090000Z
DTEND;VALUE=DATE-TIME:20261117T091500Z
DTSTAMP;VALUE=DATE-TIME:20261026T195015Z
UID:indico-contribution-961@indico.narit.or.th
DESCRIPTION:Speakers: Priyanka Saha (IIT kanpur)\nSub-horizon and quasi-st
 atic approximations are widely employed in cosmological simulations to eff
 iciently model the evolution of perturbations in theories beyond $\\Lambda
 $CDM. However\, their validity can depend on the underlying dark-sector ph
 ysics and the scales being considered. In this work\, we investigate these
  approximations in an interacting scalar-field dark-sector model\, where d
 ark matter and dark energy are coupled. We derive the full linear perturba
 tion equations and obtain their sub-horizon and quasi-static limits\, allo
 wing a direct comparison between the approximate and full dynamics. We stu
 dy the resulting evolution of matter perturbations and compare the interac
 ting model with $\\Lambda$CDM and a non-interacting scalar-field scenario.
  This provides a systematic assessment of when the approximations accurate
 ly capture the underlying perturbation dynamics and how dark-sector intera
 ctions can modify their validity. Our results are relevant for interpretin
 g and improving the treatment of interacting dark-sector models in cosmolo
 gical simulations and large-scale-structure studies.\n\nhttps://indico.nar
 it.or.th/event/234/contributions/961/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/961/
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