In the CMB rest frame you measure no velocity with respect to the CMB photons. However, the amplitude and angular direction of the effect is not necessarily the same as those of the cosmic microwave background (CMB) dipole anisotropy due to the growth of cosmic structures. Abstract The peculiar motion of the Earth causes a dipole anisotropy modulation in the distant galaxy distribution due to the aberration effect. Is In order to define a CMB rest frame, we choose an arbitrary origin point, and then we choose a velocity (relative to another reference frame we know of, such as the Earth's) such that this frame has just the right velocity that the CMB looks isotropic and homogeneous in every direction. There clearly is a frame where the CMB is at rest, and so this is, in some sense, the rest frame of the Universe. Is there any significance in the 'CMB rest frame'? Close.

u/observer314159265. This is the speed of our galaxy relative to the cosmic microwave background. It is a purely arbitrary, but, convenient way to define a 'rest frame' for the universe. There clearly is a frame where the CMB is at rest, and so this is, in some sense, the rest frame of the Universe. 2. Rest frame relative to CMB Thread starter cbetanco; Start date Nov 14, 2011; Nov 14, 2011 Relativity assumes there are no PREFERRED reference frames - i.e., the laws of physics are the same regardless of your speed and direction [reference frame]. Where does this rest frame come from? Dark energy rest frame and the CMB dipole Antonio L. Maroto Dept. Física Teórica, Universidad Complutense de Madrid, 28040 Madrid, Spain Abstract. The Milky Way is moving at 552 ± 6 km/s (1,235,000 ± 13,000 mph) with respect to the photons of the CMB, toward 10.5 right ascension, −24° declination (J2000 epoch, near the center of Hydra). Since

4 comments. Would it just be a local inertial frame that happens to have this property?

share. The peculiar motion of the Earth causes a dipole anisotropy modulation in the distant galaxy distribution due to the aberration effect. But for doing any physics experiment, any other frame is as good as this one. Is there any significance in the 'CMB rest frame'? So the only difference is that in the CMB rest frame you measure no velocity with respect to the CMB photons, but that does not imply any fundamental difference in the laws of physics. Posted by. So the only difference is that in the CMB rest frame you measure no velocity with respect to the CMB photons, but that does not imply any fundamental difference in the laws of physics. One common reference point for such matters lately is the so-called “rest frame of the cosmic microwave background (CMB).” Digression: Presumably “rest frame” does not refer to the CMB itself, which is pure (microwave) radiation, traveling, as we detect it, toward us at the speed of light. Darkenergyis usuallyparametrizedas a perfectfluidwith ne gativepressureanda certain equation of state.



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