%0 Unpublished work %T Phase Transition in the 1d Random Field ising model with long range interaction %+ Dipartimento di Fisica %+ Dipartimento di Matematica [Roma TRE] %+ Laboratoire d'Analyse, Topologie, Probabilités (LATP) %A Cassandro, Marzio %A Orlandi, Enza %A Picco, Pierre %Z GDRE 224, GREFI-MEFI CNRS-INdAM INdAM Program Professori Visitatori 2007 %8 2008-04-22 %D 2008 %Z 0804.3672 %K Phase transition %K long range interaction %Z AMS 2000 Math. Subject Classification Primary 60K35, secondary 82B20,82B43 %Z Mathematics [math]/Probability [math.PR]Preprints, Working Papers, ... %X We study the one dimensional Ising model with ferromagnetic, long range interaction which decays as |i-j|^{-2+a}, 1/2< a<1, in the presence of an external random filed. we assume that the random field is given by a collection of independent identically distributed random variables, subgaussian with mean zero. We show that for temperature and strength of the randomness (variance) small enough with P=1 with respect to the distribution of the random fields there are at least two distinct extremal Gibbs measures. %G English %Z GDRE 224 %Z GREFI-MEFI CNRS-INdAM %2 https://hal.science/hal-00275312v2/document %2 https://hal.science/hal-00275312v2/file/Dicembre3.pdf %L hal-00275312 %U https://hal.science/hal-00275312 %~ LATP %~ CNRS %~ UNIV-AMU %~ I2M