Browsing by Author "Gomis Torné, Joaquin"

Now showing items 1-7 of 7

    • Canonical realization of (2+1)-dimensional Bondi-Metzner-Sachs symmetry 

      Batlle Arnau, Carles; Campello, Víctor; Gomis Torné, Joaquin (2017-07-12)
      Article
      Open Access
      We construct canonical realizations of the (2+1)-dimensional Bondi-Metzner-Sachs (bms3) algebra as symmetry algebras of a free Klein-Gordon (KG) field in 2+1 dimensions for both massive and massless cases. We consider two ...

    • Equivalence between the Hamiltonian and Lagrangian formalisms for constrained systems 

      Batlle Arnau, Carles; Gomis Torné, Joaquin; Pons Ràfols, Josep Maria; Román Roy, Narciso (1986-08)
      Article
      Open Access
      The equivalence between the Lagrangian and Hamiltonian formalism is studied for constraint systems. A procedure to construct the Lagrangian constraints from the Hamiltonian constraints is given. Those Hamiltonian constraints ...

    • Extended Galilean symmetries of non-relativistic strings 

      Batlle Arnau, Carles; Gomis Torné, Joaquin; Not, Daniel (2017-02-09)
      Article
      Open Access
      We consider two non-relativistic strings and their Galilean symmetries. These strings are obtained as the two possible non-relativistic (NR) limits of a relativistic string. One of them is non-vibrating and represents a ...

    • Lie symmetries of nonrelativistic and relativistic motions 

      Batlle Arnau, Carles; Gomis Torné, Joaquin; Ray, Sourya; Zanelli, Jorge (American Physical Society (APS), 2019-03-15)
      Article
      Open Access
      We study the Lie symmetries of non-relativistic and relativistic higher order constant motions in d spatial dimensions, i.e. constant acceleration, constant rate-of-change -of-acceleration (constant jerk), and so on. In ...

    • Non-relativistic Bondi-Metzner-Sachs algebra 

      Batlle Arnau, Carles; Delmastro, Diego; Gomis Torné, Joaquin (2017-09-21)
      Article
      Open Access
      We construct two possible candidates for non-relativistic bms(4) algebra in four space-time dimensions by contracting the original relativistic bms(4) algebra. bms(4) algebra is infinite-dimensional and it contains the ...

    • Space-time Schrödinger symmetries of a post-Galilean particle 

      Batlle Arnau, Carles; Gomis Torné, Joaquin (Springer, 2020-08-07)
      Article
      Open Access
      We study the space-time symmetries of the actions obtained by expanding the action for a massive free relativistic particle around the Galilean action [1]. We obtain all the point space-time symmetries of the post-Galilean ...

    • Tachyons in the Galilean limit 

      Batlle Arnau, Carles; Gomis Torné, Joaquin; Mezincescu, Luca; Townsend, Paul K. (2017-04-20)
      Article
      Open Access
      The Souriau massless Galilean particle of “colour” k and spin s is shown to be the Galilean limit of the Souriau tachyon of mass m = ik and spin s. We compare and contrast this result with the Galilean limit of the Nambu-Goto ...