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SUMMARY:HEP Colloquia 2025
DTSTART:20250521T123000Z
DTEND:20250521T130000Z
DTSTAMP:20260519T101900Z
UID:indico-event-47132@agenda.infn.it
CONTACT:hepcolloquia@ca.infn.it
DESCRIPTION:Speakers: Andrea Cozzumbo (Istituto Nazionale di Fisica Nuclea
 re)\n\nMulti-messenger cosmology: probing the cosmic acceleration with gra
 vitational waves and gamma-ray bursts\nWhy is the expansion of the Univers
 e speeding up? This question has remained central in cosmology since the 
 discovery of cosmic acceleration\, and it grows more pressing in light of 
 recent results from the DESI collaboration. To unravel this mystery\, incr
 easingly precise and diverse probes of the Universe's expansion history ar
 e essential.\nGravitational wave (GW) and multi-messenger (MM) astronomy o
 ffer new avenues to study Dark Energy (DE) and test deviations from Genera
 l Relativity (GR)\, using the distance-redshift and distance duality relat
 ions\, respectively. Since both analyses rely on the same observables\, MM
  astronomy is a powerful tool to explore the nature of DE and gravity.To t
 his end\, we employ a catalog of 38 gamma-ray bursts (GRBs)\, supposedly o
 riginating from binary neutron star (BNS) mergers detected by Fermi and Sw
 ift high energy satellites\, to generate a mock dataset of MM event. Using
  a prior-informed Fisher matrix\, we forecast the sensitivity of the Einst
 ein Telescope (ET) to constrain cosmological and modified gravity (MG) par
 ameters.We assess the performance of standard DE and MG parametrizations w
 ith a more flexible\, model-independent method based on Gaussian Processes
  (GP).We examine synergies among next-generation GW interferometers and co
 smological probes such as Cosmic Microwave Background (CMB)\, Type IA Supe
 rnovae (SnIA) and Baryon Acoustic Oscillation (BAO) and we show that fewer
  than 40 GRB-GW events can provide unprecedented accuracy in constraining 
 DE phenomenology as well as potential departures from GR.\n\nhttps://agend
 a.infn.it/event/47132/
LOCATION:Sala Consiliare (Department of Physics)
URL:https://agenda.infn.it/event/47132/
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