Super 0-brane and GS Superstring Actions on AdS_2 \times S^2

Abstract

The super 0-brane and GS superstring actions on AdS${}_2\times S^2$ background with 2-form flux are constructed by supercoset approach. We find the super 0-brane action contains two parameters which are interpreted as the electric and magnetic charges of the super 0-brane. The obtained super 0-brane action describes the BPS saturated dyonic superparticle moving on AdS${}_2\times S^2$ background. The WZ action contains the required coupling with 2-form flux. For GS superstring, we find the string action on AdS${}_2\times S^2$ takes the same form as those in AdS${}_3\times S^3$ and AdS${}_5\times S^5$ with RR field background.

16 pages, LaTex file, minor typos corrected, reference added

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