PIRSA:22100096

Video URL

https://pirsa.org/22100096

An Effective Field Theory for Large Oscillons

Maslov, V. (2022). An Effective Field Theory for Large Oscillons. Perimeter Institute for Theoretical Physics. https://pirsa.org/22100096

Maslov, Vasily. An Effective Field Theory for Large Oscillons. Perimeter Institute for Theoretical Physics, Oct. 04, 2022, https://pirsa.org/22100096 

          @misc{ scivideos_PIRSA:22100096,
            doi = {10.48660/22100096},
            url = {https://pirsa.org/22100096},
            author = {Maslov, Vasily},
            keywords = {Particle Physics},
            language = {en},
            title = {An Effective Field Theory for Large Oscillons},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2022},
            month = {oct},
            note = {PIRSA:22100096 see, \url{https://scivideos.org/index.php/pirsa/22100096}}
          }

Vasily Maslov Lomonosov Moscow State University (MSU)

Talk numberPIRSA:22100096
DOI10.48660/22100096
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Based on arXiv:2208.04334. We consider oscillons - localized, quasiperiodic, and extremely long-living classical solutions in models with real scalar fields. We develop their effective description in the limit of large size at finite field strength. Namely, we note that nonlinear long-range field configurations can be described by an effective complex field ψ(t, x) which is related to the original fields by a canonical transformation. The action for ψ has the form of a systematic gradient expansion. At every order of the expansion, such an effective theory has a global U(1) symmetry and hence a family of stationary nontopological solitons - oscillons. The decay of the latter objects is a nonperturbative process from the viewpoint of the effective theory. Our approach gives an intuitive understanding of oscillons in full nonlinearity and explains their longevity. Importantly, it also provides reliable selection criteria for models with long-lived oscillons. This technique is more precise in the nonrelativistic limit, in the notable cases of nonlinear, extremely long-lived, and large objects, and also in lower spatial dimensions. We test the effective theory by performing explicit numerical simulations of a (d+1)-dimensional scalar field with a plateau potential. 

Zoom link: https://pitp.zoom.us/j/98801138609?pwd=VUJsZm41bnpBQzFoUEFwcUV6SG5Xdz09