The Gravity Field of a Particle

Details The Gravity Field of a Particle The Gravity Field of a Particle

Jan 1959

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959rspsa.249..180d&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 249, Issue 1257, pp. 180-194

Physics

107

Scientific paper

Einstein's equations for the orbits round an attracting point mass, here called the sun, are examined so as to see whether there are orbits which end in the sun, as there are in the corresponding case of electrical attraction when relativity is allowed for. With the measure of the radius as usually taken, it is shown that no hyperbolic orbit can have perihelion inside r = 3m, and an elliptic orbit cannot have perihelion inside r = 4m. Particles going inside these distances will be captured. Circular orbits are possible for any greater radius. If 3m6m is the orbit stable. A study is made of the travel of light rays. No light ray from infinity can escape capture unless its initial asymptotic distance is greater than 3surd 3 m. A field of stars surrounds the sun, and is viewed in a telescope pointed at the sun from a distance. If the field as seen is mapped as though in a plane through the sun, each star, in addition to its direct image, will show a series of faint 'ghosts' on both sides of the sun. The ghosts all lie just outside the distance 3surd 3 m. A few technical details are given about the orbits of the captured particles.

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