Geodesic
Massless Excitations of Long Strings in $\mathrm{AdS}_4\times\mathbb C\mathrm P^3$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of modern theoretical and mathematical physics: Gauge theories and superstrings, Tome 272 (2011), pp. 54-64

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We consider the $\mathrm{AdS}_4\times\mathbb C\mathrm P^3$ IIA superstring sigma model in the background of a “spinning string” classical solution with two charges. In the limit when one of the spins is infinite, there are massless excitations which govern the long-range worldsheet properties of the model. We obtain a sigma model of $\mathbb C\mathrm P^3$ with fermions which describes the dynamics of these massless modes. 
@article{TM_2011_272_a5,
     author = {D. V. Bykov},
     title = {Massless {Excitations} of {Long} {Strings} in $\mathrm{AdS}_4\times\mathbb C\mathrm P^3$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {54--64},
     publisher = {mathdoc},
     volume = {272},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_2011_272_a5/}
}
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D. V. Bykov. Massless Excitations of Long Strings in $\mathrm{AdS}_4\times\mathbb C\mathrm P^3$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Problems of modern theoretical and mathematical physics: Gauge theories and superstrings, Tome 272 (2011), pp. 54-64. http://geodesic.mathdoc.fr/item/TM_2011_272_a5/