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SUMMARY:Sherry Suyu (MPA Garching)
DTSTART:20200506T120000Z
DTEND:20200506T140000Z
DTSTAMP:20260422T212829Z
UID:CERNTHColloq/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CERNTHColloq
 /1/">Cosmology with gravitational lens time delays</a>\nby Sherry Suyu (MP
 A Garching) as part of CERN Theory Colloquium\n\n\nAbstract\nStrong gravit
 ational lenses with measured time delays between the multiple images can b
 e used to determine the Hubble constant (H0) that sets the expansion rate 
 of the Universe.  An independent determination of H0 is important to ascer
 tain the possible need of new physics beyond the standard cosmological mod
 el\, given the tension in current H0 measurements.  I will present the lat
 est results from a program aimed to measure H0 from lensed quasars.  Searc
 h is underway to find new lenses in imaging surveys.  An exciting discover
 y of the first strongly lensed supernova offered a rare opportunity to per
 form a true blind test of our modeling techniques.  I will present a new p
 rogram that exploits lensed supernovae as a powerful probe of cosmology an
 d supernova physics\, showing the bright prospects of gravitational lens t
 ime delays for cosmology.\n\nDetails at https://indico.cern.ch/event/86155
 4/\n
LOCATION:https://researchseminars.org/talk/CERNTHColloq/1/
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SUMMARY:Jesse Thaler (MIT)
DTSTART:20200520T130000Z
DTEND:20200520T140000Z
DTSTAMP:20260422T212829Z
UID:CERNTHColloq/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CERNTHColloq
 /2/">The hidden geometry of particle collisions</a>\nby Jesse Thaler (MIT)
  as part of CERN Theory Colloquium\n\n\nAbstract\nIn this colloquium\, I e
 xplain how many concepts and techniques in quantum field theory and collid
 er physics can be naturally translated into a new geometric language.  Usi
 ng the energy mover's distance\, which quantifies the minimal amount of "w
 ork" required to rearrange one event into another\, we can define a distan
 ce between pairs of collider events.  This distance can then be used to tr
 iangulate the "space" of collider events and rigorously define various geo
 metric objects.  Many well-known collider observables\, jet algorithms\, a
 nd pileup mitigation schemes have a simple geometric interpretation\, as d
 oes the important concept of infrared and collinear safety.  Intriguingly\
 , these ideas can be lifted from a distance between events into a distance
  between theories\, with potential relevance for visualizing and interpret
 ing data from the LHC.\n
LOCATION:https://researchseminars.org/talk/CERNTHColloq/2/
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