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SUMMARY:Updated Constraints on Infrared Cutoff Models and Implications for
  CMB-BAO Tension
DTSTART;VALUE=DATE-TIME:20261107T073000Z
DTEND;VALUE=DATE-TIME:20261107T080000Z
DTSTAMP;VALUE=DATE-TIME:20261023T150432Z
UID:indico-contribution-2954@indico.itp.ac.cn
DESCRIPTION:Speakers: Ujjwal Kumar Upadhyay (The Institute of Mathematical
  Sciences)\nThe nearly scale-invariant primordial power spectrum provides 
 the standard initial conditions for cosmological perturbations. However\, 
 the largest observable scales remain only weakly constrained by current CM
 B measurements\, leaving open the possibility of deviations from scale inv
 ariance\, such as an infrared (IR) cutoff in the primordial spectrum. This
  possibility is further motivated by the persistence of large-scale CMB an
 omalies\, most notably the low quadrupole power. Recently\, IR cutoff scen
 arios have attracted renewed attention due to their potential interplay wi
 th reionisation features\, which can partially alleviate the emerging CMB
 –BAO discrepancy within the $\\Lambda$CDM framework following recent DES
 I observations. In this talk\, I will discuss our recent work where we rev
 isited several broad classes of phenomenologically motivated IR cutoff mod
 els using parametrised forms of the primordial power spectrum. I will pres
 ent updated constraints on IR cutoff scenarios from recent CMB observation
 s\, discuss their implications for the CMB–BAO discrepancy\, and comment
  on the status of large-scale CMB anomalies from a Bayesian perspective of
  anomaly statistics.\n\nhttps://indico.itp.ac.cn/event/417/contributions/2
 954/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2954/
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