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This paper studies giant magnons in CP3, which in all known cases are oldsolutions from S5 placed into two- and three-dimensional subspaces of CP3,namely CP1, RP2 and RP3. We clarify some points about these subspaces, andother potentially interesting three- and four-dimensional subspaces. Afterconfirming that E-(J1-J4)/2 is a Hamiltonian for small fluctuations of therelevant 'vacuum' point particle solution, we use it to calculate thedispersion relation of each of the inequivalent giant magnons. We comment onthe embedding of finite-J solutions, and use these to compare string solutionsto giant magnons in the algebraic curve.

Giant Magnons in AdS4 x CP3: Embeddings, Charges and a Hamiltonian