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SUMMARY:Unlocking Non-linear Pairwise Velocities in the LSST Era
DTSTART;VALUE=DATE-TIME:20261020T123500Z
DTEND;VALUE=DATE-TIME:20261020T125000Z
DTSTAMP;VALUE=DATE-TIME:20261112T103443Z
UID:indico-contribution-2264@events.ncbj.gov.pl
DESCRIPTION:Speakers: Mariana Jaber (NCBJ)\nPeculiar velocities provide a 
 complementary probe of large-scale structure by directly tracing the gravi
 tational dynamics of structure formation. Yet observational analyses of pa
 irwise velocities and the pairwise kinetic Sunyaev-Zel’dovich signal rem
 ain largely restricted to linear and quasi-linear scales\, leaving substan
 tial cosmological information at smaller separations untapped.\n\nWe prese
 nt a simulation-calibrated likelihood for the mean pairwise velocity\, v12
 (r\,a)\, based on the exact pair conservation equation and non-linear matt
 er clustering\, validated against the Quijote and TNG300-3 simulations. Ex
 tending the analysis from a linear-regime baseline of 50 Mpc/h down to 4 M
 pc/h at z=0.5 reduces the uncertainty on fσ8 by up to 86%\, while the joi
 nt Ωm–fσ8 Figure-of-Merit improves by up to a factor of 9.1.\n\nThese 
 gains motivate asking how much of this non-linear information can be recov
 ered with LSST-era datasets. LSST will provide dense photometric samples f
 or cross-correlation with spectroscopic and CMB surveys\, while photometri
 c redshift uncertainties\, tracer selection and galaxy velocity bias compl
 icate the interpretation of small-scale pairs. Our framework provides a co
 ntrolled starting point for quantifying these effects and determining the 
 scales on which non-linear pairwise motions can become a practical cosmolo
 gical probe.\n\nhttps://events.ncbj.gov.pl/event/502/contributions/2264/
LOCATION:
URL:https://events.ncbj.gov.pl/event/502/contributions/2264/
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