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SUMMARY:Testing Horndeski Gravity in the Era of Stage IV Surveys
DTSTART:20251030T131500Z
DTEND:20251030T144500Z
DTSTAMP:20260410T204600Z
UID:indico-event-283@indico.physik.uni-bielefeld.de
DESCRIPTION:Speakers: Matteo Cataneo (University of Bonn)\n\nThis is an ex
 ceptionally exciting time for cosmology. The Euclid mission has begun mapp
 ing the Universe with unprecedented precision\, and the Legacy Survey of S
 pace and Time (LSST) will soon follow\, together delivering observations t
 hat will transform our ability to test gravity and dark energy. At the sam
 e time\, recent results from the Dark Energy Spectroscopic Instrument (DES
 I)\, hinting at an evolving dark energy equation of state - possibly cross
 ing the phantom divide - have reignited interest in alternatives to the st
 andard cosmological model\, ΛCDM. The simplest extensions introduce an ad
 ditional scalar field\, originally motivated as a dynamical form of dark e
 nergy that could reproduce cosmic acceleration without invoking a cosmolog
 ical constant. This seemingly minimal modification\, however\, opens a vas
 t and intricate theory space. Horndeski gravity provides a unifying framew
 ork to organise this landscape of scalar–tensor theories and to systemat
 ically constrain departures from ΛCDM in the ongoing search for the physi
 cs driving cosmic acceleration.Confronting these theories with data requir
 es modelling techniques that can predict cosmological observables across a
  broad range of physical scales - from the linear regime of large-scale st
 ructure to the deeply non-linear scales of clusters and groups of galaxies
 . In this talk\, I will present a modelling strategy grounded in effective
  field theory and the halo model that achieves this goal for general Hornd
 eski cosmologies. I will show how this approach streamlines both theoretic
 al exploration and data analysis\, and outline a roadmap of methodological
  advances designed to make the framework robust and fully deployable for f
 orthcoming Stage IV survey analyses.\n \n\nhttps://indico.physik.uni-biel
 efeld.de/event/283/
LOCATION:D6-135 (UHG)
URL:https://indico.physik.uni-bielefeld.de/event/283/
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