Moving dark energy and the CMB dipole

Abstract

We explore the possibility that the rest frames of CMB, matter and dark\nenergy differ one from another, i.e. they do not converge on very large scales.\nIn such a case, the usual interpretation of the CMB dipole as being due to the\nrelative motion of the observer with respect to the CMB rest frame is not\nappropriate. Instead, we find that the measured dipole is due to the observer\nmotion relative to the cosmic center of mass rest frame. This means, in\nparticular, that even an observer at rest with respect to the CMB radiation\ncould measure a non-vanishing dipole anisotropy, provided dark energy is moving\nwith respect to the CMB. We also consider the consequences of moving dark\nenergy for the determination of cosmic bulk flows.\n