The Particle Spectrum of N=4 d=4 Gauge Theory and (p,q) Webs
The masses and spins of stable particles in 4d N=4 spontaneously broken SU(N_c)
are discussed. For N_c<=3 the spectrum is BPS, and can be described by string
webs. The webs exhibit walls of marginal stability and enable the counting of
fermionic zero modes which carry spin. For N_c>=4 the webs are generically
non-BPS, and their masses are unknown, but they can be continously connected to
Mathematical implications are mentioned.
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