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SUMMARY:Plenary — Takashi Hiramatsu: Cosmological Constraints on Extende
 d Theories of Gravity from CMB Observations
DTSTART;VALUE=DATE-TIME:20261117T040000Z
DTEND;VALUE=DATE-TIME:20261117T050000Z
DTSTAMP;VALUE=DATE-TIME:20261026T185332Z
UID:indico-contribution-1067@indico.narit.or.th
DESCRIPTION:The late-time accelerated expansion of the Universe\, revealed
  by observations of Type Ia supernovae and other cosmological probes\, may
  be explained by extensions of general relativity. Various extended theori
 es of gravity have been proposed to explore gravitational physics beyond g
 eneral relativity. In this talk\, I will focus on constraining such theori
 es using observations of the cosmic microwave background (CMB). In particu
 lar\, I will consider degenerate higher-order scalar-tensor (DHOST) theori
 es\, generalised Proca theories\, and a model propagating only two tensor 
 degrees of freedom. To investigate these theories\, we have developed a Bo
 ltzmann solver incorporating the effective field theory (EFT) approach to 
 gravity. Using this solver\, we perform Markov chain Monte Carlo (MCMC) an
 alyses with the Planck 2018 likelihood to derive observational constraints
  on the EFT parameters characterising each model.\n\nhttps://indico.narit.
 or.th/event/234/contributions/1067/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/1067/
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