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X-WR-CALNAME:Technion-Haifa University String Theory Group
X-WR-CALDESC:Technion-Haifa University String Theory Group
X-FROM-URL:https://phsites.technion.ac.il/strings
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DTSTART:20221030T020000
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UID:7dg17tuu7lqur4ffc8ihuvpi4i@google.com
DTSTAMP:20230204T033540Z
CATEGORIES;LANGUAGE=en-US:Neve Shalom
CONTACT:
DESCRIPTION:Title: Boundary conditions for a free scalar field\nAbstract:
\nIn the first part of the talk\, I will consider the problem of classifyi
ng the conformal boundary conditions (b.c.) for the free scalar CFT. We wi
ll see how to tackle this problem using conformal bootstrap techniques. In
the case of 4d bulk\, I will show ournumerical results\, which feature a
“kink” that indicates the existence of a non-trivial “interacting” b.c.\,
besides the obvious Neumann and Dirichlet “free” b.c.’s.\nIn the second pa
rt of the talk\, I will discuss the RG flow of a 4d free scalar field cou
pled to large N vector models on the boundary. The (classically marginal)
coupling involves the boundary mode of the scalar and the O(N) single-trac
e scalar operator. Iwill explain that the resulting RG connects two fixed
points with bulk and boundary decoupled\, and the local 3d sector is the f
ree vector model in one end\, and the critical one in the other end. This
same RG admits two weak-strong dual descriptions\, one fromthe free end\,
and one from the critical end.
DTSTART;TZID=Asia/Jerusalem:20201013T113000
DTEND;TZID=Asia/Jerusalem:20201013T123000
SEQUENCE:0
SUMMARY:Lorenzo di Pietro
URL:https://phsites.technion.ac.il/strings/event/lorenzo-di-pietro-2/
X-ALT-DESC;FMTTYPE=text/html:\\n\\n\\n\\n\\n Title: Bound
ary conditions for a free scalar field

\nAbstract:

\nIn the f
irst part of the talk\, I will consider the problem of classifying the con
formal boundary conditions (b.c.) for the free scalar CFT. We will see how
to tackle this problem using conformal bootstrap techniques. In the case
of 4d bulk\, I will show ournumerical results\, which feature a “kink” tha
t indicates the existence of a non-trivial “interacting” b.c.\, besides th
e obvious Neumann and Dirichlet “free” b.c.’s.

\nIn the second part
of the talk\, I will discuss the RG flow of a 4d free scalar field couple
d to large N vector models on the boundary. The (classically marginal) cou
pling involves the boundary mode of the scalar and the O(N) single-trace s
calar operator. Iwill explain that the resulting RG connects two fixed poi
nts with bulk and boundary decoupled\, and the local 3d sector is the free
vector model in one end\, and the critical one in the other end. This sam
e RG admits two weak-strong dual descriptions\, one fromthe free end\, and
one from the critical end.

\n
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