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An effective field theory is derived that describes the low-frequency spindynamics in the low-temperature orthorombic phase of La_2CuO_4. Restricted to asingle CuO_2 layer the effective theory is a simple generalization of therelativistic nonlinear sigma model to include all spin interactions allowed bysymmetry. Incorporating a weak interlayer interaction leads to two couplednonlinear sigma models which provide an efficient description of the completebilayer dynamics. Particular attention is paid to the weak-ferromagnetic andspin-flop transitions induced by external magnetic fields. The main features ofthe observed (covert) weak ferromagnetism are thus accounted for in astraightforward manner but some of the finer theoretical predictions wouldrequire further experimental investigation. The derived framework is alsosuitable for the study of the structure and dynamics of magnetic domains inundoped La_2CuO_4.Comment: 15 pages, 8 figure

Low-frequency spin dynamics in the orthorhombic phase of La2CuO4