Universe from Nothing?

[Walking Void]

I like to lean with Lawrence Krauss when it comes to theories of the universe's start. Please note that these theories do not entail the start of "time". To paraphrase the description of empty space before the fully material universe, space with a mass density of 0g/m^3 (0 grams per meter cubed) and as a result an energy density of 0j/m^3 (0 joules per meter cubed- sorry for the shitty notation) is empty space. Empty space does not mean that there is no energy. No, in fact, an energy density of 0 just means that the energy within a volume sums to a total of 0. 0 times any number or divided by any number is 0. We have theories about negative energy, and together with positive energy like the energy of gravity, they cancel out. Say I had a joule of energy, and a negative joule of energy. If the meter cubed of space they occupied were to be measured, the density would be 0, because (1 - 1) / m^3 = 0. Always. Oh, I forgot that joules per meter cubed can also be called pascals. I should use that.

This is also said in much the same way about matter. Using the conservation of mass, matter cannot be destroyed or created, it can only change. And 1 of those transformations is the conversion of energy into mass, as You have probably seen in Einstein's mass-energy equivalence. Concentrated energy produces matter, and this is done by condensing the energy into a single point. We do not know what forces act upon massless sources of energy, otherwise We would know what caused the big bang.

Conclusion: science does not know what caused the big bang.

EDIT: Made a boo boo and used negative energy in place of dark energy.