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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20211104T103000
DTEND;TZID=Atlantic/Canary:20211104T113000
UID:iactalks-1528
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1528
CREATED:2021-11-04T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:How well does galaxy clustering constrain cosmology?
DESCRIPTION:How well does galaxy clustering constrain cosmology?\nDr. Sergi
 o Contreras\n\n \nOn the LCDM cosmology, dark matter collapses into v
 irialised objects called haloes. The abundance and distribution of these h
 aloes are a direct consequence of the cosmology of the Universe. By constr
 aining the dark matter halo clustering, we could also constraint the cosmo
 logy from our Universe. Since dark matter haloes can not be observed, we n
 eed to use galaxies to trace them.\n\nIn this talk, I will present a new m
 ethod that we develop capable of constraining cosmological information fro
 m the redshift space galaxy clustering.  We use the scaling of cosmol
 ogical simulations and the SubHalo Abundance Matching extended (SHAMe) emp
 irical model to produce realistic galaxy clustering measurements over a wi
 de range of cosmologies. We generate more than 500,000 clustering measurem
 ents at different cosmological and SHAMe parameters to build an emulator c
 apable of reproducing the projected correlation function, monopole and qua
 drupole of the galaxies. We run an MCMC using this emulator to constrain t
 he cosmology of the TNG300 hydrodynamic simulation. We correctly predicted
  the cosmology of the TNG300 simulation constraining sigma8 between [0.75,
 0.83] and Omega matter h^2 between [0.127,0.162]. The best constraints are
  obtained when including scales below 2 Mpc/h and when combining all diffe
 rent clustering statistics. We conclude that our approach can be used to c
 onstrain cosmological and galaxy formation parameters from the galaxy clus
 tering of galaxy surveys.\n\n
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