We show that the external Compton (EC) model for the production of the GeV emission in blazars makes specific predictions for the spectrum and variability of those blazars characterized by a high Compton dominance (Compton to synchrotron luminosity ratio). These unavoidable features have not been observed, casting doubt on the validity of this popular model. We argue that synchrotron-self Compt...

In the early 20th century, research into the interaction of X-rays with matter was an emerging field. It was observed that when a beam of X-rays is directed at an atom, an electron is ejected and the light is scattered through an angle θ, as illustrated below. Classical electromagnetism predicts that the wavelength of scattered rays should be equal to the initial wavelength; however, experiment...

Nuclear Compton scattering in the ∆-resonance region is reconsidered within the framework of the ∆-hole model. The different role of the resonant and non-resonant contributions to the transition amplitudes is discussed and their effect is investigated by comparing the results of calculation with recent data also taken with polarized photons. PACS numbers: 13.60.Fz, 24.70.+s, 25.20.Dc

In 1923, Arthur Holly Compton introduced what today is known as the wavelength. Even if scattering derivation by relativistic in sense that it takes into account momentum of photons traveling at speed light, original indirectly assumes electron stationary moment scattered electrons, but not after has been hit photons. Here, we extend this to derive for case when initially moving a velocity v.