4 ms·
If the speed of light were different in one direction, the CMB would not look as uniform as it is.
by x3n0ph3n3 3y ago
If the speed of light were different in one direction, the CMB would not look as uniform as it is.
- ars 3y agoOnly in a closed universe, where light "wraps around". Otherwise it would look exactly the same.
- x3n0ph3n3 3y agoThat doesn't sound right. Please explain.
- ivalm 3y agoTo be fair, there is Doppler shift in cmb, we are moving about 370km/s relative to cmb rest frame. You can possibly imagine a world where some of this asymmetry is from a lorentzian ether.
- x3n0ph3n3 3y agoThat's fair, but highly improbable!
- deleted 3y ago[deleted]
- Kranar 3y agoYou make an excellent point but as it turns out the CMB would still appear uniform even the speed of light was not the same in all directions. The reason is that if the speed of light is different in one direction, then the effect of time dilation will also be different depending on direction as well and these two factors cancel one another out resulting in what will still appear as a uniform CMB. The below paper goes into complete technical details giving an example of the speed of light being c / 2 in one direction and instantaneous in another direction (so that it averages out to c), and how the differing time dilations result an isotropic view of the universe. https://arxiv.org/pdf/2012.12037.pdf https://arxiv.org/pdf/2012.12037.pdf