Why does this singularity signal the breakdown of general relativity?

Extrapolation of the expansion of the Universe backwards in time using general relativity yields an infinite density and temperature at a finite time in the past.[29] This singularity signals the breakdown of general relativity.





I understand the first part, but why does this singularity signal the breakdown of general relativity?





Thank you for your time.|||Infinity is conceptual.





Temperature in blunt format is vibration. At absolute zero there is no vibration. at 20 degrees there is some. Go higher to 1,000,000 and there is enough to cause some vivid reactions. What does it do at infinity?





With density. You can pack in things and divide by 2 as many times as you want, you'll never reach the end. So if it's infinitely dense then it also must be infinitely small which equates to 0.





General relativity can't work with nothing, and it can't work with undefined figures such as infinite temperature. It breaks down when you add in values which exist, but only as a concept. The whole of physics can't stand this, not just relativity.





PROOF:


Try dividing by 0.





Let's say 10/5, the answer is 2, meaning that 2 by 5 is 10.


Now try 10/0, to find the answer you need to find out what multiplyed by 0 equals 10.





Maths can cope with plenty of things but when you hand it an undefined value such as 0 above, it doesn't work. 0s and ?s don't exist in nature, so our understanding of maths and physics can't manipulate them.





I hope this helps.|||The concept of infinity is not well handled in classical physics because the mathematics does not lead to definite solutions. Here's an example.





The easiest way to show the concept of a singularity is to examine y = k/x where k is some constant and x is the independent variable. Let x = 0, which is like letting space-time have zero dimensions as a point in space. Then y = k/0 ---%26gt; infinity.





And that's what happens with the general theory of relativity when we try to apply it to point space, which is what quanta are... dimensionless point space. This is why we say the special and general theories apply only to macro space; they both invoke a singularity when one tries to apply them to dimensionless quanta.





To a point, observations seem to confirm our big bang had a very high, but finite temperature and a finite, but quite a lot of mass-energy. So any answer of infinity, which the GTR gives us at the quantum level, is not confirmed by observations.|||“The universe is governed by 2 sets of laws that do not agree.” – Brian Greene, The Elegant Universe.





General Relativity, The Macro Universe (Things larger than an atom and high energy/mass)





Quantum Mechanics, The Micro Universe (Things smaller than an atom and low energy/mass)





Neither theory works or can be applied to the other scale.





We do NOT have a theory to handle things that are small and high energy/mass (The Big Bang and inside the event horizon of black holes). The math for both general relativity and quantum mechanics break down and give nonsense answers