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DTSTAMP:20250205T084223
DTSTART;TZID=America/Detroit:20250221T150000
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SUMMARY:Lecture / Discussion:HET Seminar | The Gauge Theory Bootstrap: Computing Pion amplitudes and low energy parameters from QCD.
DESCRIPTION:Under the assumption of confinement and chiral symmetry breaking the low energy description of QCD is in terms of an effective theory of pions whose properties (couplings) should be derived from the high energy Lagrangian (QCD). In this talk I will describe recent work in collaboration with Yifei He where we propose a bootstrap method to compute pion scattering phase shifts and low energy effective action coefficients. The method looks for the most general S-matrix that matches at low energy the tree level amplitudes of the non-linear sigma model and at high energy\, QCD sum rules and form factors. This is a theoretical/numerical calculation that uses as only data the pion mass\, pion decay constant fpi and the QCD parameters Nc=3\, Nf=2\, mq and alpha_s. The results are in reasonable agreement with experiment. In particular\, we find the rho(770)\, f2(1270) and rho(1450) resonances.  The interplay between the UV gauge theory and low energy pion physics is an example of a general situation where we know the microscopic theory as well as the effective theory of long wavelength fluctuations but we want to solve the strongly coupled dynamics at intermediate energies. The bootstrap builds a bridge  between the low and high energy by determining the consistent S-matrix that matches both and provides\, in this case\, a new direction to understand the strongly coupled physics of gauge theories.
UID:130752-21866812@events.umich.edu
URL:https://events.umich.edu/event/130752
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:High Energy Theory Seminar,Physics
LOCATION:Randall Laboratory - 3481
CONTACT:
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DTSTAMP:20250303T063217
DTSTART;TZID=America/Detroit:20250221T150000
DTEND;TZID=America/Detroit:20250221T153000
SUMMARY:Careers / Jobs:My First Year Teaching in Albemarle County Public Schools
DESCRIPTION:In this second edition\, we will check back in with one of our first year teachers. Winter break recharge\, winter weather\, back forsecond semester.We hope to see you there.
UID:132697-21871614@events.umich.edu
URL:https://events.umich.edu/event/132697
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:
LOCATION:
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20250217T004231
DTSTART;TZID=America/Detroit:20250221T150000
DTEND;TZID=America/Detroit:20250221T160000
SUMMARY:Workshop / Seminar:Student Algebraic Geometry: The Mckay Correspondence
DESCRIPTION:The Mckay Correspondence is a bijection between finite subgroups of SL(2\,C)\, rational double points on surfaces\, and the ADE Dynkin diagrams. This links various \"exceptional objects\" appearing in classifications\, for example\, associating the regular icosahedron to the E8 diagram. I will outline an explanation of the correspondence by relating the geometry of the minimal resolution of the quotient C^2/G to the representation theory of the finite subgroup G of SL(2\,C). I will also mention generalizations to higher dimensions and the setting of derived categories.
UID:132812-21871908@events.umich.edu
URL:https://events.umich.edu/event/132812
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 2866
CONTACT:
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