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SUMMARY:Sherry Suyu (MPA Garching)
DTSTART:20200506T120000Z
DTEND:20200506T140000Z
DTSTAMP:20260404T094149Z
UID:CERNTHColloq/1
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/CERNT
 HColloq/1/">Cosmology with gravitational lens time delays</a>\nby Sherry S
 uyu (MPA Garching) as part of CERN Theory Colloquium\n\n\nAbstract\nStrong
  gravitational lenses with measured time delays between the multiple image
 s can be used to determine the Hubble constant (H0) that sets the expansio
 n rate of the Universe.  An independent determination of H0 is important t
 o ascertain the possible need of new physics beyond the standard cosmologi
 cal model\, given the tension in current H0 measurements.  I will present 
 the latest results from a program aimed to measure H0 from lensed quasars.
   Search is underway to find new lenses in imaging surveys.  An exciting d
 iscovery of the first strongly lensed supernova offered a rare opportunity
  to perform a true blind test of our modeling techniques.  I will present 
 a new program that exploits lensed supernovae as a powerful probe of cosmo
 logy and supernova physics\, showing the bright prospects of gravitational
  lens time delays for cosmology.\n\nDetails at https://indico.cern.ch/even
 t/861554/\n
LOCATION:https://stable.researchseminars.org/talk/CERNTHColloq/1/
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SUMMARY:Jesse Thaler (MIT)
DTSTART:20200520T130000Z
DTEND:20200520T140000Z
DTSTAMP:20260404T094149Z
UID:CERNTHColloq/2
DESCRIPTION:Title: <a href="https://stable.researchseminars.org/talk/CERNT
 HColloq/2/">The hidden geometry of particle collisions</a>\nby Jesse Thale
 r (MIT) as part of CERN Theory Colloquium\n\n\nAbstract\nIn this colloquiu
 m\, I explain how many concepts and techniques in quantum field theory and
  collider physics can be naturally translated into a new geometric languag
 e.  Using the energy mover's distance\, which quantifies the minimal amoun
 t of "work" required to rearrange one event into another\, we can define a
  distance between pairs of collider events.  This distance can then be use
 d to triangulate the "space" of collider events and rigorously define vari
 ous geometric objects.  Many well-known collider observables\, jet algorit
 hms\, and pileup mitigation schemes have a simple geometric interpretation
 \, as does the important concept of infrared and collinear safety.  Intrig
 uingly\, these ideas can be lifted from a distance between events into a d
 istance between theories\, with potential relevance for visualizing and in
 terpreting data from the LHC.\n
LOCATION:https://stable.researchseminars.org/talk/CERNTHColloq/2/
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