BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//AIP Calendar//www.aip.de//
BEGIN:VEVENT
SUMMARY:AIP Seminar | Geraint Lewis (University of Sydney)
DTSTART:20260616T123000Z
DTEND:20260616T133000Z
DTSTAMP:20260610T062508Z
UID:www.aip.de-2504
CATEGORIES:Scientific
CATEGORIES:Scientific Talk
CATEGORIES:Public
CATEGORIES:AIP Seminar
CONTACT:Marcel Pawlowski <mpawlowski@aip.de>
DESCRIPTION:Speaker: Geraint Lewis (University of Sydney)\nTitle: Confront
 ing the Cosmological Principle: How secure are the foundations of the cosm
 os?\nAbstract: For nearly a century\, the cosmological principle has been 
 the bedrock of our understanding of the universe. But what if this foundat
 ion is starting to crack? In this talk\, I describe how we have used quasa
 rs and radio galaxies to test the assumption that the cosmos is isotropic 
 and homogeneous. We know that the Cosmic Microwave Background displays a s
 trong dipole\, attributed to our motion relative to the local Hubble flow\
 , and if this motion truly defines our cosmic frame\, its imprint should a
 ppear elsewhere. Indeed\, we find a dipole in large-scale surveys of cosmo
 logical sources\, and whilst the direction agrees\,  the amplitude does no
 t\, diverging sharply from expectations based on the CMB. I will explore p
 ossible explanations for these tensions and ask whether they signal new ph
 ysics or a fundamental shift in our cosmological worldview.\n
LOCATION:AIP\; Kirch building\, Conference room
END:VEVENT
END:VCALENDAR