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SUMMARY:Angelo Esposito (EPFL)
DTSTART:20200619T163000Z
DTEND:20200619T173000Z
DTSTAMP:20260423T035927Z
UID:CMU-TP/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CMU-TP/2/">A
 n effective field theory for acoustic and pseudo-acoustic phonons in solid
 s</a>\nby Angelo Esposito (EPFL) as part of Carnegie Mellon theoretical ph
 ysics\n\n\nAbstract\nSolids generally feature many phonon branches\, with 
 different dispersion relations. Gapless acoustic phonons are known to be t
 he Goldstone bosons of the spontaneous breaking of spacetime symmetries as
 sociated to the solid phase. Other gapped phonons are generally non-univer
 sal degrees of freedom\, which depend on the microscopic details of the so
 lid. In this talk I will show that some of these gapped phonons can actual
 ly be seen as pseudo-Goldstones associated to some small explicit breaking
 . In this regime it is possible to include them in a low-energy EFT\, toge
 ther with the gapless phonons. I will explicitly construct such an EFT for
  the case of one and two spatial dimensions\, two ‘flavors’ and in the
  isotropic limit. I will then compute some test observables and show that 
 they match what already known (when available).\n
LOCATION:https://researchseminars.org/talk/CMU-TP/2/
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