Abstract
Most of our information about the solar system, stars, galaxies, and the universe as a whole comes from observing photons. This chapter analyzes the lightlike objects—vectors, curves, submanifolds, and so on—used in interpreting photon observations. Throughout the chapter, (M, g) is a spacetime. We shall say a curve γ:ℰ → M goes from x ∈ M to y ∈ M iff ℰ = [a, b], x = γa and y = γb.
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© 1977 Springer-Verlag, New York Inc.
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Sachs, R.K., Wu, HH. (1977). Photons. In: General Relativity for Mathematicians. Graduate Texts in Mathematics, vol 48. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-9903-5_6
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DOI: https://doi.org/10.1007/978-1-4612-9903-5_6
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-9905-9
Online ISBN: 978-1-4612-9903-5
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