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SUMMARY:NITEP Lecture Series 第3回
DTSTART;VALUE=DATE-TIME:20190416T070000Z
DTEND;VALUE=DATE-TIME:20190416T100000Z
DTSTAMP;VALUE=DATE-TIME:20260816T185849Z
UID:indico-event-38@indico.nitep.omu.ac.jp
DESCRIPTION:Speaker: Nobuyoshi Ohta (Kindai)\nTitle: Introduction to asymp
 totic safety\n日時：2019年4月16日(火) 16:00から2コマ\, 4月17
 日(水)16:00から2コマ\n場所：大阪市立大学文化交流セン
 ター 大セミナー室\n\nAbstract: One of the long-standing and impor
 tant problems in theoretical physics is how to formulate the quantum theor
 y of gravity. In this series of lectures\, I will try to explain one of th
 e promising approaches to this problem within the framework of covariant l
 ocal field theory based on the functional renormalization group\, known as
  asymptotic safety. First\, I will explain how the theory of quadratic cur
 vature theory is renormalizable but suffers from the problem of non-unitar
 ity\, and the Einstein gravity is nonrenormalizable. Next\, I formulate th
 e functional renormalization group equation with effective average action\
 , and explain how to define the quantum gravity using the idea of asymptot
 ic safety and critical surface. This in particular leads us to the notion 
 of nonperturbative renormalizability. I then apply the machinery to the Ei
 nstein gravity on the sphere\, using the heat kernel expansion. The approa
 ch is further extended to f(R) gravity\, and discuss if we can decide the 
 dimension of critical surface\, or narrow down what kind of theory can be 
 nonperturbatively renormalizable. If time allows\, I will discuss the theo
 ry with higher curvature theory on arbitrary backgrounds and also the effe
 cts of matter.\n\nhttps://indico.nitep.osaka-cu.ac.jp/event/38/
LOCATION:
URL:https://indico.nitep.osaka-cu.ac.jp/event/38/
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