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Exact Solutions and Scalar Fields in Gravity - Instituto Avanzado de ...

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Theta formula for the Ernst potential of the rigidly rotat<strong>in</strong>g disk of dust 49<br />

It is convenient to <strong>in</strong>troduce the follow<strong>in</strong>g comb<strong>in</strong>ations of the arguments.<br />

The results of the last section lead immediately to the equations<br />

(upper sign corresponds to <strong>and</strong> lower sign to<br />

From the <strong>de</strong>f<strong>in</strong>ition of Rosenha<strong>in</strong>’s theta functions one can f<strong>in</strong>d the relations:<br />

Us<strong>in</strong>g these properties equation (66) leads to the result:<br />

For<br />

For

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