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SUMMARY:HEP Colloquia 2026
DTSTART:20260706T123000Z
DTEND:20260706T133000Z
DTSTAMP:20261114T142300Z
UID:indico-event-52899@agenda.infn.it
CONTACT:hepcolloquia@ca.infn.it
DESCRIPTION:Speakers: Marco Galoppo (University of Canterbury\, Christchur
 ch\, New Zealand)\n\nDetection of anisotropic cosmic structures on a gigap
 arsec scale\nGalaxy surveys allow us to test one of the deepest assumption
 s in modern cosmology: that\, on sufficiently large scales\, the Universe 
 becomes statistically uniform and looks the same in every direction. In th
 e standard model\, the cosmic web of galaxies\, filaments\, walls and void
 s should gradually lose its directional structure on very large scales.In 
 this talk\, I will present the results reported in 10.1038/s41586-026-1070
 2-5. In particular \, I will discuss the evidence from the first DESI data
  release that this transition may not happen as quickly as expected. Using
  the Angular Distribution of Pairwise Distances\, a parameter-free statist
 ic that measures whether galaxy pairs preferentially align along particula
 r directions\, we find coherent directional patterns extending to scales o
 f order one gigaparsec. These signals are stronger than those found in iso
 tropic controls and in geometry-matched ΛCDM mock catalogues\, with conse
 rvative significances greater than 3σ.I will explain the method\, show ho
 w the signal appears in DESI galaxy samples\, and discuss what these resul
 ts could imply for the cosmological principle\, the growth of cosmic struc
 ture\, and possible new physics in the dark sector or gravity.\n \n\n \n
 \nhttps://agenda.infn.it/event/52899/
LOCATION:Sala Consiliare (Department of Physics)
URL:https://agenda.infn.it/event/52899/
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