Preliminary Determination of the Sun's Gravitational Quadrupole Moment from Rotational Splitting of Global Oscillations and its Relevance to Tests of General Relativity

Physics

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Relativity And Gravitation

Scientific paper

The sun's internal angular velocity is estimated from observations of rotational splitting of low-order, low-degree global oscillations detected as fluctuations in the limb-darkening function. The inferred rapid rotation implies a unitless grativational quadrupole moment, J2, of (5.5+/-1.3)×10-6. When this result is combined with two published planetary radar results, values of 0.987+/-0.006 and 0.991+/-0.006 are obtained for 13(2+2γ-β), a quantity equal to 1 in the general theory of relativity.

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