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SUMMARY:PTchat: Cosmology Perturbation Theory in the Era of Stage IV Surve
 ys
DTSTART:20261124T010000Z
DTEND:20261127T070000Z
DTSTAMP:20260627T051400Z
UID:indico-event-39928@indico.in2p3.fr
CONTACT:sandrine.codis@cnrs.fr
DESCRIPTION:This workshop will be the fifth in the PTChat series devoted t
 o analytic approaches to the large-scale structure (LSS) of the Universe i
 n the subject of cosmology. Previous PTChat meetings (Saclay 2011\; Cargè
 se 2013\; IAP 2016\; YITP 2019) successfully fostered active discussions o
 n perturbation theory and nonlinear structure formation.After a several-ye
 ar interval\, the field is now entering a new phase driven by major forthc
 oming datasets. Euclid’s first data release (DR1) is scheduled for 2026\
 , followed by DR2 in 2028\, and complemented by recent and upcoming data f
 rom DESI (DR2)\, KiDS-Legacy\, HSC\, PFS\, Rubin\, Roman\, and SPHEREx. Th
 ese Stage-IV surveys demand significant advances in theoretical modeling\,
  statistical methodology\, and cross-survey analysis. Renewed discussions 
 among theorists are therefore essential to keep pace with observational pr
 ogress.The proposed PTChat workshop aims to bring together leading researc
 hers to exchange recent developments\, identify key challenges\, and stimu
 late collaborations that can respond to this rapidly evolving landscape.Th
 e scientific program will focus on two broad and complementary directions:
 A. Challenges from Stage-IV cosmological surveys● Methods to fully explo
 it high-precision data from Euclid\, DESI\, Rubin\, and other next-generat
 ion surveys.● Cross-correlation strategies for heterogeneous datasets (g
 alaxy clustering\, weak lensing\, CMB lensing\, intensity mapping).● Obs
 ervational signature of modified gravity and clustering dark energy.● De
 tecting subtle signatures of beyond-standard cosmology\, including primord
 ial non-Gaussianity (f_NL\, g_NL)\, parity violation\, cosmic birefringenc
 e\, statistical anisotropiesB. New theoretical and methodological developm
 ents● Advances in renormalized and resummed perturbation theory (PT)\; o
 pportunity for extended presentations on Vlasov PT.● Applications of lar
 ge-deviation theory to nonlinear statistics.● Field- and simulation-base
 d inference: assessing their performance and future potential.● Links to
  early-Universe physics\, including primordial black hole formation and re
 lated statistics.\n\n\n\nOrganizers :\n\n\n\n\nFrancis Bernardeau\n(IPhT)\
 n \n\n\nSandrine Codis\n(CNRS/AIM)\n \n\n\nAlexandre Barthelemy\n(CEA/DA
 p)\n \n\n\nAtsushi Taruya\n(YITP)\n \n\n\nTakahiro Nishimichi\n(Kyoto Sa
 ngyo University)\n \n\n\nKen Osato\n(Chiba University)\n\n\n\n\n\n\n\n\nh
 ttps://indico.in2p3.fr/event/39928/
URL:https://indico.in2p3.fr/event/39928/
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