The angular appearance of white holes

Narlikar, J. V. ; Kapoor, R. C. (1978) The angular appearance of white holes Astrophysics and Space Science, 53 (1). pp. 155-163. ISSN 0004-640X

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It is shown that non-radial light rays emitted from the surface of a white hole can emerge from inside the Schwarzschild barrier. The upper limit on their impact parameter is calculated under the requirement that such rays are blueshifted. The apparent angular size of the white hole determined by blueshifted rays is shown to grow so rapidly in the early stages of its expansion that it produces the appearance of superluminal expansion.

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