# Experimental status of the Big Bang theory

Take the most successful version of the Big Bang theory

I'm aware that the Big Bang theory have unanswered questions related to the very first moments of the Big Bang.

I also know that for our current Universe state, the Big Bang theory with the Inflation theory have great success with respect to many observations like the homogeneity, CMB etc.

My question is, for our current Universe state, is there any observation(s) which could not be justified by the Big Bang theory?(except matter-antimatter amount problem)

• The proportion between matter and antimatter is the first thing that comes to mind – Ballanzor Mar 10 at 23:26
• I'm looking for something different. This I already know. I will edit my question for this. Thank you. – Aman pawar Mar 10 at 23:28
• Dark matter and dark energy are still quite mysterious. We may still be in for some surprises. – my2cts Mar 10 at 23:33
• The dimensions of a regulation billiards table cannot be justified by the Big Bang theory. I'm sure there are a great many additional examples. – WillO Mar 11 at 2:03
• Possible duplicates: physics.stackexchange.com/q/11136/2451 , physics.stackexchange.com/q/300242/2451 – Qmechanic Mar 11 at 2:50

There is also tension between the values of the Hubble constant found from distance-ladder techniques and analysis of the CMB and BAO. The former give about $$72\pm 2$$, in units of km/s/Mpc, while the latter give about $$67.5\pm 0.5$$. This may simply be a case where people always underestimate their systematic errors, or it may be a sign of new physics causing the universe to accelerate its expansion more rapidly than predicted by $$\Lambda\text{CDM}$$ models. Proposed solutions involve physical ingredients such as sterile neutrinos, axions, and phantom energy.