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Tidal Evolution of Rubble Piles
Peter Goldreich, Re'em Sari
Many small bodies in the solar system are believed to be rubble piles, a collection of smaller elements separated by voids. We propose a model for the structure of a self-gravitati…
Constraints on Deep-seated Zonal Winds Inside Jupiter and Saturn
Junjun Liu, Peter Goldreich, David Stevenson
The atmospheres of Jupiter and Saturn exhibit strong and stable zonal winds. How deep the winds penetrate unabated into each planet is unknown. Our investigation favors shallow win…
Spontaneous axisymmetry breaking of Saturn's external magnetic field
Peter Goldreich, Alison J. Farmer
Saturn's magnetic field is remarkably axisymmetric. Its dipole axis is inclined by less than 0.2 deg with respect to its rotation axis. Rotationally driven convection of magnetosph…
Imbalanced Strong MHD Turbulence
Yoram Lithwick, Peter Goldreich, S. Sridhar
We present a phenomenological model of imbalanced MHD turbulence in an incompressible magnetofluid. The steady-state cascades, of waves traveling in opposite directions along the m…
Spherical Accretion
Re'em Sari, Peter Goldreich
We compare different examples of spherical accretion onto a gravitating mass. Limiting cases include the accretion of a collisionally dominated fluid and the accretion of collision…
Folded Fields as the Source of Extreme Radio-Wave Scattering in the Galactic Center
Peter Goldreich, S. Sridhar
A strong case has been made that radio waves from sources within about half a degree of the Galactic Center undergo extreme diffractive scattering. However, problems arise when sta…