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SUMMARY:Critical Phenomena on the Bethe Lattice
DTSTART:20260402T053000Z
DTEND:20260402T063000Z
DTSTAMP:20260504T021600Z
UID:indico-event-9314@scitalks.tifr.res.in
DESCRIPTION:Speakers: Saswato Sen (Okinawa Institute of Science and Techno
 logy)\n\nWe investigate the critical behavior of a family of Z2-symmetric 
 scalar field theories on the Bethe lattice (the tree limit of regular hype
 rbolic tessellations) using both the non -perturbative Functional Renormal
 ization Group and perturbation theory. Due to the hyperbolic nature of Bet
 he lattices\, the Laplacian lacks a zero mode and exhibits a spectral gap.
  We demonstrate that closing the spectral gap via a modified Laplacian lea
 ds to novel critical behavior governed by interacting fixed points. This
  stands in contrast to the nearest-neighbor Ising model\, which exhibits a
  phase transition with mean-field critical exponents. We further comment o
 n the possible reasons for such a deviation.\n \nBased on arxiv:2601.0196
 1.\n\nhttps://scitalks.tifr.res.in/event/9314/
LOCATION: A304 and on Zoom
URL:https://scitalks.tifr.res.in/event/9314/
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