No. When space expands, there is no sense in which a galaxy has absolute motion. Locally, stars will emit light independent of the expansion of space. There's nothing happening locally to affect the emission of light.Adel Makram said:TL;DR Summary: Do galaxies that have surpassed the speed of light during the cosmic inflation process emit radiation waves comparable to the sonic boom when an aeroplane breaches the sound barrier?
Cosmic expansion refers to the observation that the universe is growing in size over time. This phenomenon was first discovered by Edwin Hubble in the 1920s when he observed that distant galaxies are moving away from us, indicating that space itself is expanding. This expansion is described by the Big Bang theory, which posits that the universe began as a singularity and has been expanding ever since.
Cosmic expansion is measured using the redshift of light from distant galaxies. As the universe expands, the light from these galaxies is stretched to longer, redder wavelengths. By measuring this redshift, astronomers can determine how fast a galaxy is moving away from us. This data is then used to calculate the rate of expansion, known as the Hubble constant.
Cosmic shock waves are high-energy waves that travel through space, often as a result of violent astrophysical events such as supernovae, collisions between galaxy clusters, or the formation of large-scale structures in the universe. These shock waves can heat and compress the interstellar medium, leading to various observable phenomena such as X-ray emissions and the acceleration of cosmic rays.
Cosmic shock waves can significantly impact the interstellar medium by compressing and heating the gas and dust that fill the space between stars. This can trigger the formation of new stars by causing regions of the interstellar medium to collapse under gravity. Additionally, shock waves can accelerate particles to high energies, contributing to the cosmic ray population and influencing the chemical composition of the galaxy.
While cosmic expansion and shock waves are distinct phenomena, they are interconnected in the sense that the large-scale structure of the universe and the distribution of matter can influence the occurrence and propagation of shock waves. For example, as the universe expands and galaxies form and evolve, collisions between galaxy clusters can generate powerful shock waves. Additionally, the expansion of the universe affects the density and temperature of the intergalactic medium, which in turn influences the behavior of shock waves traveling through it.