Doppler Shift

The Doppler Shift of light is the change in frequency of a wave in relation to an observer who is moving relative to the wave source. It was named after the Austrian physicist Christian Doppler, who described the phenomenon in 1842. Light waves from a moving source experience the Doppler shift as either a redshift or blueshift in the light's frequency. When an object approaches the observer its light will blueshift, and when it recedes from the observer its light will redshift.

Discussions on this topic typically ask how the galaxies can be redshifted if they are not receding away from the observer at very high speeds, as is suggested by the traditional expanding universe model. An answer to this query is that the Doppler Shift of light is only one interpretation for the redshifts. A page at the University of North Carolina explains:

http://www.cs.unc.edu/~plaisted/ce/redshift.html (Archive)

Jacques Moret-Bailly
Physics Professor Jacques Moret-Bailly of the University of Burgundy has written a number of papers on physical alternatives to Doppler Shift.

Correspondence of classical and quantum irreversibilities

Abstract

Conclusion

The coherent Raman scattering in astrophysics; application to a new model of quasar (Archive)

Propagation of Light in Low-Pressure Ionized and Atomic Hydrogen: Application to Astrophysics

Abstract

Alternative Redshift Theories
plasma-universe.com lists a number of alternative redshift theories at https://www.plasma-universe.com/redshift/ (Archive)