title: Maxwell superalgebra and superparticles in constant gauge backgrounds.
abstract: We present the Maxwell superalgebra, an N=1, D=4 algebra with two Majorana supercharges, obtained as the minimal enlargement of a Poincaré superalgebra containing the Maxwell algebra as a subalgebra. The new superalgebra describes the supersymmetries of generalized N=1, D=4 superspace in the presence of a constant Abelian supersymmetric field strength background. Applying the techniques of nonlinear coset realization to the Maxwell supergroup we propose a new kappa-invariant massless superparticle model providing a dynamical realization of the Maxwell superalgebra.
authors.affiliation: Institute of Nuclear Physics, NCSR Demokritos, 15310 Aghia Paraskevi, Attiki, Greece.
authors.forename: Sotirios
authors.initials: S
authors.lastname: Bonanos
authors.forename: Joaquim
authors.initials: J
authors.lastname: Gomis
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Kamimura
authors.forename: Jerzy
authors.initials: J
authors.lastname: Lukierski