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SUMMARY:Vladimir Rosenhaus (CUNY)
DTSTART:20251021T183000Z
DTEND:20251021T193000Z
DTSTAMP:20260423T005713Z
UID:nhetc/117
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/nhetc/117/">
 Renormalization Group in far-from-equilibrium states</a>\nby Vladimir Rose
 nhaus (CUNY) as part of NHETC Seminar\n\n\nAbstract\nWe study renormalizat
 ion group flows in far-from-equilibrium states. The study is made tractabl
 e by focusing on states that are spatially homogeneous\, time-independent\
 , and scale invariant. Such states\, in which mode k has occupation number
  $n_k = k^{-\\gamma}$\, are well-known in nonlinear physics (going under t
 he name of wave turbulence). RG flow in such states is qualitatively diffe
 rent than in the vacuum -- a positive $\\gamma$ decreases the dimension of
  an operator\, turning marginal interactions into relevant interactions. W
 e compute one loop beta functions. Depending on the sign of the beta funct
 ion\, backreaction may either cause a minor shift of the state in the IR\,
  or completely change the nature of the state. Focusing on nearly marginal
  interactions\, we construct an analog of the epsilon expansion and IR fix
 ed points\, with epsilon now set by the scaling of the interaction rather 
 than the spacetime dimension. In the language of RG flow\, critical balanc
 e scaling -- having applications in fields as varied as astrophysics and o
 cean waves -- corresponds to the state dynamically adjusting itself along 
 the RG flow until the interaction becomes marginal.\n
LOCATION:https://researchseminars.org/talk/nhetc/117/
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