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BEGIN:VEVENT
SUMMARY:Eva Silverstein (Stanford)
DTSTART;VALUE=DATE-TIME:20200520T161500Z
DTEND;VALUE=DATE-TIME:20200520T171500Z
DTSTAMP;VALUE=DATE-TIME:20240328T111301Z
UID:CambridgeHEPGRColl/1
DESCRIPTION:Title: Multipoint Correlators in Multifield Cosmology: formal structur
e and applications\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;VALUE=DATE-TIME:20200527T143000Z
DTEND;VALUE=DATE-TIME:20200527T153000Z
DTSTAMP;VALUE=DATE-TIME:20240328T111301Z
UID:CambridgeHEPGRColl/2
DESCRIPTION:Title: Tension in the Hubble Constant\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/
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BEGIN:VEVENT
SUMMARY:Matt Reece (Harvard)
DTSTART;VALUE=DATE-TIME:20200603T131500Z
DTEND;VALUE=DATE-TIME:20200603T141500Z
DTSTAMP;VALUE=DATE-TIME:20240328T111301Z
UID:CambridgeHEPGRColl/3
DESCRIPTION:Title: A Swampland Tour\, From Global Symmetries to Axion Physics\
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;VALUE=DATE-TIME:20200610T131500Z
DTEND;VALUE=DATE-TIME:20200610T141500Z
DTSTAMP;VALUE=DATE-TIME:20240328T111301Z
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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