Unconstrained canonical action for, and positive energy of, massive spin 2
2015 ◽
Vol 93
(4)
◽
pp. 395-397
◽
Filling a much-needed gap, we exhibit the D = 4 Fierz–Pauli massive s = 2 action, and its — manifestly positive — energy, in terms of its 2s + 1 = 5 unconstrained helicity (2, 1, 0) excitations, after reducing and diagonalizing the troublesome helicity-zero sector.