Relativistic Doppler effect

The relativistic Doppler effect is the change in frequency, wavelength and amplitude^[1] of light, caused by the relative motion of the source and the observer (as in the classical Doppler effect, first proposed by Christian Doppler in 1842^[2]), when taking into account effects described by the special theory of relativity.

The relativistic Doppler effect is different from the non-relativistic Doppler effect as the equations include the time dilation effect of special relativity and do not involve the medium of propagation as a reference point. They describe the total difference in observed frequencies and possess the required Lorentz symmetry.

Astronomers know of three sources of redshift/blueshift: Doppler shifts; gravitational redshifts (due to light exiting a gravitational field); and cosmological expansion (where space itself stretches). This article concerns itself only with Doppler shifts.

^ Daniel Kiefer (2014). Relativistic Electron Mirrors: from High Intensity Laser–Nanofoil Interactions (illustrated ed.). Springer. p. 22. ISBN 978-3-319-07752-9. Extract of page 22
^ Nolte, David (2020-03-01). "The Fall and Rise of the Doppler Effect ..." pubs.aip.org/physicstoday. Retrieved 2024-11-02.

[1] Daniel Kiefer (2014). Relativistic Electron Mirrors: from High Intensity Laser–Nanofoil Interactions (illustrated ed.). Springer. p. 22. ISBN 978-3-319-07752-9. Extract of page 22

[2] Nolte, David (2020-03-01). "The Fall and Rise of the Doppler Effect ..." pubs.aip.org/physicstoday. Retrieved 2024-11-02.

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Relativistic Doppler effect

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