By considering the irreducible representations of the Lorentz group, an analysis of the different spin-2 waves is presented. In particular, the question of the helicity is discussed. It is concluded that, although from the point of view of representation theory there are no compelling reasons to choose between spin-2 waves with helicity sigma = +/- 1 or sigma = +/- 2, consistency arguments of the ensuing field theories favor waves with helicity sigma = +/- 1.
机构:
Univ Penn, Dept Astron & Astrophys, Ctr Particle Cosmol, Philadelphia, PA 19104 USAUniv Penn, Dept Astron & Astrophys, Ctr Particle Cosmol, Philadelphia, PA 19104 USA
Hinterbichler, Kurt
Rosen, Rachel A.
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Columbia Univ, Dept Phys, New York, NY 10027 USA
Columbia Univ, Inst Strings Cosmol & Astroparticle Phys, New York, NY 10027 USAUniv Penn, Dept Astron & Astrophys, Ctr Particle Cosmol, Philadelphia, PA 19104 USA