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SUMMARY:Probing Extragalactic Electromagnetic Fields with Astroparticles
DTSTART:20260512T090000Z
DTEND:20260512T100000Z
DTSTAMP:20260506T143900Z
UID:indico-event-1816@indico.dfa.unipd.it
CONTACT:elisa.prandini@unipd.it
DESCRIPTION:Speakers: Jonathan Biteau (Université Paris-Saclay\, IJCLab I
 nstitut universitaire de France)\n\nAt first glance\, the question of what
  the universe is made of may seem unrelated to astroparticle physics. It i
 s\, in fact\, optical and microwave observations that have revealed that t
 he energy balance of the universe is dominated by the density of dark ener
 gy (~70%) and dark matter (~25%). The nature of these two entities is elus
 ive to this day. The remaining 5% is sometimes erroneously excluded from t
 he realm of cosmology and attributed to gastrophysics\, a form of sophisti
 cated (French or Italian) cuisine that would incorporate warm-hot plasma (
 approximately 4%)\, stars in various stages of evolution (a few per thousa
 nd)\, and supermassive black holes (a few parts per million). These entiti
 es are sometimes distinguished by their complexity from the pre-dark ages 
 relics\, namely hydrogen\, helium\, and the diffuse neutrino and microwave
  backgrounds (total of less than two per thousand). \nIn this seminar\, I 
 will provide an overview of how astroparticles\, in particular very-high-e
 nergy gamma rays and ultra-high-energy cosmic rays\, are employed as a pow
 erful tool to investigate the components of what is sometimes referred to 
 as gastrophysics. Photons in the GeV-TeV energy range emitted in the vicin
 ity of stellar-sized and supermassive black holes at cosmological distance
 s have been used by the astroparticle community to study the plasma of the
  intergalactic medium and the associated magnetic fields\, to measure the 
 photon fields radiated by all the stars and dust grains in the universe\, 
 and to constrain the expansion rate of the universe. At the energy frontie
 r\, probed only by astroparticle physics\, ultra-high energy cosmic rays a
 re starting to reveal their mysteries\, after a sixty-year long search for
  their sources. \nA crucial ingredient in the recipe for identifying the 
 transient nature of their elusive sources lies in the magnetic fields pres
 ent in the cosmic web. The preparation of such culinary delights over the 
 past decade heralds the advent of a more substantial banquet in the decade
  to come\, which will require astroparticle physicists\, radio astronomers
 \, optical astronomers and cosmologists to gather around the table.\n\nhtt
 ps://indico.dfa.unipd.it/event/1816/
LOCATION:1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edi
 ficio Marzolo)
URL:https://indico.dfa.unipd.it/event/1816/
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