What Does the Cold Spot in the CMB Reveal About Parallel Universes?

[Chalnoth]

Chalnoth, I wasnt referring to the cold spot here, just how there was a need during inflation for all parts of the universe to be in thermal equilibrium with each other in order to explain the uniform CMBR temperatures that we see today. I recall the speed of sound was mentioned. So what I was asking was if divergence of the CMBR radiation also equalises the CMBR temperatures anyway, then maybe that helps relax or reduce the need for the temperature to be so equal or flat or uniform during the inflation stage. Maybe I am not using the right terms.

That's not really the case. What you need during inflation is a small region of space-time dominated by an inflaton with a nearly uniform distribution. Inflation makes the temperature uniform. But it does need to start with a nearly-uniform field value for the inflaton.

But there is no divergence to speak of. As I mentioned, the very concept of divergence is a property of focused beams of light. There was no focused beam, so there is no divergence.

 

[Imax]

Maybe the Coldspot is at or near the Big Bang :)?

 

[Chalnoth]

Maybe the Coldspot is at or near the Big Bang :)?

Huh? It's no closer or further away from the big bang, in any sense, than the rest of the CMB.