Le 15/12/2017 Ã* 05:33, Steve Willner a écritÂ*:
Fig 2 of the paper shows that seeds need to be 1000 Msun at z=40 or
1E4 Msun (not 10E4) at z=22 or so if the subsequent accretion is at
Eddington rate. Temperature at z=40 is about 112 K (hardly "searing
hot").

1) At z = 1000 we have a temperature of 2,728 degrees... Completely new
and unknown processes must have been at work to form structures like a
black hole at those temperatures. And nothing less than a black hole of
1E4 solar masses. It seems (to me) impossible that gravity can condense
something at those temperatures.

2) At z = 40 we have a temperature of 112 K. Star formation happens in
clouds with temperatures between 10 to 20 K. Yes, 112 K is not "searing
hot", but hot enough to make star formation impossible.

3) If we assume that star formation could happen at 50 K, i.e. at z =
17, approx 228 My after the bang, that leaves 690 - 228 --462 My to
form a black hole that has an 800 Msun mass...

I am not saying that BB theory is impossible. I am just saying that
explaining observations within that framework becomes more and more
difficult, requiring more and more "ad hoc" hypothesis (now we have
primordial black holes) and requiring explanations that look less and
less probable. And observations that contradict the bang start coming
almost daily now. ALMA has seen a galactic collision at 780 My and the
two galaxies are very dusty and huge... I will post another article
about that.