[Todos] Coloquio DF (Extra): Alejandro Kievsky (INFN-Pisa): Hoy Martes 19/11, 14hs, Aula Seminario, 1er piso, Pab. I

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COLOQUIO (EXTRA) DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA

            En el Aula Seminario, 1er piso, Pab. I, 

            Hoy Martes 19/11, 14hs:

            ALEJANDRO KIEVSKY

            ISTITUTO NAZIONALE DE FISICA NUCLEARE - PISA 

UNIVERSALITY IN SHALLOW N-BOSON STATES

  The Efimov effect is a remarkable phenomenon of the
  three-boson system: when the two-body scattering length

  is large a sequence of arbitrary shallow three-body bound states

  appear with accumulation point at E=0. This feature was discovered

  by V. Efimov in 1970 and triggered an intense theoretical as

  well as an experimental activity to study this phenomenon. Though

  the work by Efimov was originated in nuclear phyiscs, much of

  the experimental activity is at present done in the sector of

  ultracold atoms. From a theoretical point of view the Efimov

  effect is characterized by a discrete scaling symmetry and

  the Efimov spectrum is governed by an universal function.

  In the present talk I will analyze the evolution of the Efimov

  spectrum with N, the number of bosons. I will show that the

  discrete scaling symmetry strongly constrains the spectrum of

  the N-boson system. Some universal ratios between energy levels
  are derived.
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