Abstract
We have calculated all order-parameter collective modes and their contributions to the spin and charge susceptibilities for possible p-wave pairing states in ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}.$ The susceptibilities are calculated for pairing states having gaps without and with nodes, and for wave vectors $\mathbf{q}=0$ and nesting vector $\mathbf{q}=\mathbf{Q}$ associated with the \ensuremath{\alpha} and \ensuremath{\beta} bands of ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}.$ Important for the observability of the spin-fluctuation modes, for example, by spin resonance or neutron scattering, and of the charge-fluctuation modes by ultrasound, is the effect of quasiparticle damping. This effect is taken into account and discussed in connection with recent neutron-scattering data on ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}.$
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