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

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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 can be identified with 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 require 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.

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