BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//UM//UM*Events//EN
CALSCALE:GREGORIAN
BEGIN:VTIMEZONE
TZID:America/Detroit
TZURL:http://tzurl.org/zoneinfo/America/Detroit
X-LIC-LOCATION:America/Detroit
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20070311T020000
RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20071104T020000
RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTAMP:20261009T151118
DTSTART;TZID=America/Detroit:20261023T150000
DTEND;TZID=America/Detroit:20261023T160000
SUMMARY:Lecture / Discussion:HET Seminar | Dark Energy and Time Reparametrizations
DESCRIPTION:The cosmological constant’s quantum origin is a famous open problem in theoretical physics and cosmology. Its observed value and theoretical prediction exhibit a large 120-order discrepancy. In this talk\, we first summarize the current state of research on the cosmological constant problem and review the Schwarzian theory of time reparametrizations in the literature. Inspired by an early work by Gary Gibbons and our recent attempts to solve various formidable problems (e.g.\, color confinement in SYM\, fluid/gravity correspondence at low temperatures\, etc.) via the JT gravity/Schwarzian theory duality\, we apply the Schwarzian theory of time reparametrizations and its ensemble average to the cosmological constant problem and propose a new approach to resolving it. We will show that this new method\, at leading order\, yields a theoretical value that exactly matches the observed value of the cosmological constant. However\, recent results from dark energy observations (such as DESI) suggest a dynamical dark energy. Starting from the leading-order constant value\, we will take into account matter-gravity interactions and develop a more realistic dynamical dark energy model based on time reparametrizations that can fit observational data with comparable precision to other models (e.g.\, LCDM and CPL). We also provide some falsifiable predictions for future more precise observations. This talk is based on my recent paper arXiv:2602.17476 and another upcoming work.\n\nBrief Biography:\nJun Nian is an assistant professor at the International Centre for Theoretical Physics Asia-Pacific (ICTP-AP)\, University of Chinese Academy of Sciences. He received a Diplom degree from the University of Heidelberg in 2009 and a Ph.D. degree from Stony Brook University in 2015. Before joining ICTP-AP in 2021\, he was a postdoctoral fellow at Institut des Hautes Etudes Scientifiques (IHES)\, the University of Michigan\, and the University of Milan. His research interests include quantum field theory\, gravity theory\, and string theory\, with a recent focus on the quantum-gravitational effects in black holes and cosmology.
UID:151803-21912195@events.umich.edu
URL:https://events.umich.edu/event/151803
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Lecture,Physics,Science,Seminar,Talk
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261008T113210
DTSTART;TZID=America/Detroit:20261028T100000
DTEND;TZID=America/Detroit:20261028T110000
SUMMARY:Lecture / Discussion:AI for Physics Seminar Series
DESCRIPTION:This seminar series will take place in 340 West Hall\, Bi-weekly\, Wednesdays from 10:00--11:00 am\n\nFor details please see\;\n\nhttps://umich-ai4physics.github.io/)
UID:151090-21912209@events.umich.edu
URL:https://events.umich.edu/event/151090
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Lecture,Physics,Science
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261008T191237
DTSTART;TZID=America/Detroit:20261028T120000
DTEND;TZID=America/Detroit:20261028T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar | What is the simplest holographic matrix model?
DESCRIPTION:I’ll talk about a Hermitian two matrix model called the Hoppe model\, which has an interesting strong coupling limit where the matrices commute with each other. Furthermore\, there exists an emergent area preserving diffeomorphism symmetry of this model at strong coupling\, which allows us to completely solve it at leading order. The solution for all n-point connected correlators takes the form of a Witten diagram-like expansion in an emergent two-dimensional spacetime. I’ll also briefly talk about commuting strong coupling limits in more general multi-matrix integrals\, including supersymmetric ones. The talk will be based on https://arxiv.org/pdf/2608.14781 and https://arxiv.org/pdf/2607.21593.
UID:151080-21910843@events.umich.edu
URL:https://events.umich.edu/event/151080
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Brown Bag Seminar,Lecture,Physics,Science
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260908T200121
DTSTART;TZID=America/Detroit:20261030T150000
DTEND;TZID=America/Detroit:20261030T160000
SUMMARY:Lecture / Discussion:HET Seminar |
DESCRIPTION:tbd
UID:151804-21912196@events.umich.edu
URL:https://events.umich.edu/event/151804
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Talk,High Energy Theory Seminar,Lecture,Physics,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260829T094517
DTSTART;TZID=America/Detroit:20261104T120000
DTEND;TZID=America/Detroit:20261104T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar |
DESCRIPTION:tbd
UID:151159-21910990@events.umich.edu
URL:https://events.umich.edu/event/151159
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Brown Bag Seminar,Lecture,Physics,Science,Talk
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260825T093241
DTSTART;TZID=America/Detroit:20261106T150000
DTEND;TZID=America/Detroit:20261106T160000
SUMMARY:Lecture / Discussion:HET Seminar |
DESCRIPTION:tbd
UID:150864-21910328@events.umich.edu
URL:https://events.umich.edu/event/150864
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,High Energy Theory Seminar,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261008T113210
DTSTART;TZID=America/Detroit:20261111T100000
DTEND;TZID=America/Detroit:20261111T110000
SUMMARY:Lecture / Discussion:AI for Physics Seminar Series
DESCRIPTION:This seminar series will take place in 340 West Hall\, Bi-weekly\, Wednesdays from 10:00--11:00 am\n\nFor details please see\;\n\nhttps://umich-ai4physics.github.io/)
UID:151090-21912210@events.umich.edu
URL:https://events.umich.edu/event/151090
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Lecture,Physics,Science
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260829T094746
DTSTART;TZID=America/Detroit:20261111T120000
DTEND;TZID=America/Detroit:20261111T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar |
DESCRIPTION:tbd
UID:151160-21910991@events.umich.edu
URL:https://events.umich.edu/event/151160
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Brown Bag Seminar,brown bag,Lecture,Physics,Talk,Science
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261009T150752
DTSTART;TZID=America/Detroit:20261113T150000
DTEND;TZID=America/Detroit:20261113T160000
SUMMARY:Lecture / Discussion:HET Seminar |
DESCRIPTION:tbd
UID:151162-21910993@events.umich.edu
URL:https://events.umich.edu/event/151162
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Lecture,Physics,Science,Seminar,Talk
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261008T113210
DTSTART;TZID=America/Detroit:20261118T100000
DTEND;TZID=America/Detroit:20261118T110000
SUMMARY:Lecture / Discussion:AI for Physics Seminar Series
DESCRIPTION:This seminar series will take place in 340 West Hall\, Bi-weekly\, Wednesdays from 10:00--11:00 am\n\nFor details please see\;\n\nhttps://umich-ai4physics.github.io/)
UID:151090-21912211@events.umich.edu
URL:https://events.umich.edu/event/151090
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Lecture,Physics,Science
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260901T084933
DTSTART;TZID=America/Detroit:20261118T120000
DTEND;TZID=America/Detroit:20261118T130000
SUMMARY:Lecture / Discussion:HET Brown Bag |
DESCRIPTION:tbd
UID:151289-21911322@events.umich.edu
URL:https://events.umich.edu/event/151289
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,Science,Talk,Lecture,Brown Bag Seminar,brown bag
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260908T152059
DTSTART;TZID=America/Detroit:20261120T150000
DTEND;TZID=America/Detroit:20261120T160000
SUMMARY:Lecture / Discussion:HET Seminar |
DESCRIPTION:tbd
UID:151751-21912130@events.umich.edu
URL:https://events.umich.edu/event/151751
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Lecture,Physics,Science,Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20261008T113210
DTSTART;TZID=America/Detroit:20261202T100000
DTEND;TZID=America/Detroit:20261202T110000
SUMMARY:Lecture / Discussion:AI for Physics Seminar Series
DESCRIPTION:This seminar series will take place in 340 West Hall\, Bi-weekly\, Wednesdays from 10:00--11:00 am\n\nFor details please see\;\n\nhttps://umich-ai4physics.github.io/)
UID:151090-21911642@events.umich.edu
URL:https://events.umich.edu/event/151090
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Lecture,Physics,Science
LOCATION:West Hall - 340
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260829T095001
DTSTART;TZID=America/Detroit:20261202T120000
DTEND;TZID=America/Detroit:20261202T130000
SUMMARY:Lecture / Discussion:HET Brown Bag Seminar |
DESCRIPTION:tbd
UID:151161-21910992@events.umich.edu
URL:https://events.umich.edu/event/151161
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:brown bag,Lecture,Talk,Science,Physics,Brown Bag Seminar
LOCATION:Randall Laboratory - 3481
CONTACT:
END:VEVENT
BEGIN:VEVENT
DTSTAMP:20260902T123913
DTSTART;TZID=America/Detroit:20261204T150000
DTEND;TZID=America/Detroit:20261204T160000
SUMMARY:Lecture / Discussion:HET Seminar
DESCRIPTION:tbd
UID:151403-21911505@events.umich.edu
URL:https://events.umich.edu/event/151403
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Seminar,Science,Physics,Lecture,High Energy Theory Seminar
LOCATION:Randall Laboratory - 4404
CONTACT:
END:VEVENT
END:VCALENDAR