I What is power suppression in CMB experiments?

[windy miller]

I have heard that results form CMB experiments show a suppression of power at large angular scales. Can someone explain what "suppression of power" means in laymen terms in this context?

 

[Arman777]

I have heard that results form CMB experiments show a suppression of power at large angular scales. Can someone explain what "suppression of power" means in laymen terms in this context?

Any reference maybe ?

 

[windy miller]

Any reference maybe ?

here for example https://arxiv.org/abs/1904.07249

 

[kimbyd]

I have heard that results form CMB experiments show a suppression of power at large angular scales. Can someone explain what "suppression of power" means in laymen terms in this context?

It means that there is less variance in temperature from place to place on the sky at those scales than expected. I'm not sure there is sufficient that this is a real effect and not just a statistical anomaly.

What this paper seems to state, judging by the abstract, is that one possible explanation for this apparent suppression of power doesn't work. I don't know the broader context of this paper, but I would guess that some theorists had previously claimed that this kind of inflation model might provide an explanation.

 

[windy miller]

Thanks , that is very helpful