Browsing by Author "Gomis Torné, Joaquin"
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Canonical realization of (2+1)dimensional BondiMetznerSachs symmetry
Batlle Arnau, Carles; Campello, Víctor; Gomis Torné, Joaquin (20170712)
Article
Open AccessWe construct canonical realizations of the (2+1)dimensional BondiMetznerSachs (bms3) algebra as symmetry algebras of a free KleinGordon (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 (198608)
Article
Open AccessThe 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 nonrelativistic strings
Batlle Arnau, Carles; Gomis Torné, Joaquin; Not, Daniel (20170209)
Article
Open AccessWe consider two nonrelativistic strings and their Galilean symmetries. These strings are obtained as the two possible nonrelativistic (NR) limits of a relativistic string. One of them is nonvibrating and represents a ... 
Lie symmetries of nonrelativistic and relativistic motions
Batlle Arnau, Carles; Gomis Torné, Joaquin; Ray, Sourya; Zanelli, Jorge (American Physical Society (APS), 20190315)
Article
Open AccessWe study the Lie symmetries of nonrelativistic and relativistic higher order constant motions in d spatial dimensions, i.e. constant acceleration, constant rateofchange ofacceleration (constant jerk), and so on. In ... 
Nonrelativistic BondiMetznerSachs algebra
Batlle Arnau, Carles; Delmastro, Diego; Gomis Torné, Joaquin (20170921)
Article
Open AccessWe construct two possible candidates for nonrelativistic bms(4) algebra in four spacetime dimensions by contracting the original relativistic bms(4) algebra. bms(4) algebra is infinitedimensional and it contains the ... 
Spacetime Schrödinger symmetries of a postGalilean particle
Batlle Arnau, Carles; Gomis Torné, Joaquin (Springer, 20200807)
Article
Open AccessWe study the spacetime 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 spacetime symmetries of the postGalilean ... 
Tachyons in the Galilean limit
Batlle Arnau, Carles; Gomis Torné, Joaquin; Mezincescu, Luca; Townsend, Paul K. (20170420)
Article
Open AccessThe 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 NambuGoto ...