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BEGIN:VEVENT
SUMMARY:Eva Silverstein (Stanford)
DTSTART:20200520T161500Z
DTEND:20200520T171500Z
DTSTAMP:20260422T225930Z
UID:CambridgeHEPGRColl/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CambridgeHEP
 GRColl/1/">Multipoint Correlators in Multifield Cosmology: formal structur
 e and applications</a>\nby Eva Silverstein (Stanford) as part of Cambridge
  HEP-GR colloquium\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CambridgeHEPGRColl/1/
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BEGIN:VEVENT
SUMMARY:Wendy Freedman (University of Chicago)
DTSTART:20200527T143000Z
DTEND:20200527T153000Z
DTSTAMP:20260422T225930Z
UID:CambridgeHEPGRColl/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CambridgeHEP
 GRColl/2/">Tension in the Hubble Constant</a>\nby Wendy Freedman (Universi
 ty of Chicago) as part of Cambridge HEP-GR colloquium\n\n\nAbstract\nOver 
 the last couple of decades\, the accuracy with which we can measure distan
 ces to galaxies and determine Ho has improved significantly. I will discus
 s two of our most precise methods for measuring distances in the local uni
 verse: Cepheids and the Tip of the Red Giant Branch (TRGB). I will present
  new results from the Carnegie-Chicago Hubble Program (CCHP)\, the goal of
  which is to independently measure a value of the Hubble constant to very 
 high precision and accuracy. We have built an entirely new extragalactic d
 istance scale from the ground up. Using the Hubble Space Telescope Advance
 d Camera for Surveys\, the CCHP is using the TRGB to calibrate Type Ia sup
 ernovae. Our value of the Hubble constant\, Ho = 69.6 / 0.8 (statistical) 
 / 1.7 (systematic) km/sec/Mpc\, falls midway between the value obtained fr
 om the Planck Cosmic Microwave Background analysis\, and that obtained usi
 ng Cepheids. I will address the uncertainties\, discuss the current tensio
 n in Ho\, and whether there is need for additional physics beyond the stan
 dard CDM model.\n
LOCATION:https://researchseminars.org/talk/CambridgeHEPGRColl/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matt Reece (Harvard)
DTSTART:20200603T131500Z
DTEND:20200603T141500Z
DTSTAMP:20260422T225930Z
UID:CambridgeHEPGRColl/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CambridgeHEP
 GRColl/3/">A Swampland Tour\, From Global Symmetries to Axion Physics</a>\
 nby Matt Reece (Harvard) as part of Cambridge HEP-GR colloquium\n\n\nAbstr
 act\nThe Swampland program aims to distinguish effective quantum field the
 ories that can potentially arise within UV-complete quantum gravity theori
 es (“the Landscape”) from those that cannot (“the Swampland”). The
  most well-established such criterion is that theories of quantum gravity 
 never have exact global symmetries. I will discuss some generalizations an
 d consequences of this idea. In particular\, I will discuss work in progre
 ss (with Heidenreich\, McNamara\, Montero\, Rudelius\, and Valenzuela) on 
 how axion fields often play a crucial role in banishing global symmetries 
 from a theory\, with potential phenomenological implications.\n
LOCATION:https://researchseminars.org/talk/CambridgeHEPGRColl/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jiji Fan (Brown University)
DTSTART:20200610T131500Z
DTEND:20200610T141500Z
DTSTAMP:20260422T225930Z
UID:CambridgeHEPGRColl/4
DESCRIPTION:by Jiji Fan (Brown University) as part of Cambridge HEP-GR col
 loquium\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/CambridgeHEPGRColl/4/
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