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UID:0-845@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20221004T140000
DTEND;TZID=Europe/Paris:20221004T150000
DTSTAMP:20220921T100227Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-emilio-trevisani-ipht/
SUMMARY:Séminaire du LPTMS : Emilio Trevisani (IPhT) - Salle des séminair
 es du FAST et du LPTMS\, bâtiment Pascal n°530 - 4 Oct 22 14:00
DESCRIPTION:Random field models and Parisi-Sourlas supersymmetry\nEmilio Tr
 evisani (Institut de Physique Theorique)\n\n*** UNUSUAL TIME!! ***\n\nHybr
 id: onsite seminar + zoom.\n\nRegister for this meeting:\nhttps://cnrs.zoo
 m.us/meeting/register/tJMuf--oqzIuHt2mjcx_ksGra4epEaJNOu9C \nAfter registe
 ring\, you will receive a confirmation email containing information about 
 joining the meeting.\n\nQuenched disorder is very important but notoriousl
 y hard. In 1979\, Parisi and Sourlas proposed an interesting and powerful 
 conjecture about the infrared fixed points with random field (RF) type of 
 disorder: such fixed points should possess an unusual supersymmetry\, by w
 hich they reduce in two less spatial dimensions to usual non-supersymmetri
 c non-disordered fixed points. The conjecture is known to hold for the RF 
 φ^3 model but not for RF φ^4 model in d < 5 dimensions\, however there i
 s no consensus on why this happens.  We argue that: \n1) dimensional reduc
 tion works for any Parisi-Sourlas SUSY fixed point\;\n2) the SUSY fixed po
 int is not always reached because of new relevant SUSY-breaking interactio
 ns. \nWe attack the point 1) using axiomatic CFT techniques while we study
  the point 2)  using the perturbative renormalization group in a judicious
 ly chosen field basis\, allowing systematic exploration of the space of in
 teractions. Our computations agree with the numerical results for both cub
 ic and quartic potential. 
CATEGORIES:seminars
LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53
 0\, rue André Riviere\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\
 , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST 
 et du LPTMS\, bâtiment Pascal n°530:geo:0,0
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