For one thing, it cannot explain how we experience things that seem physically real but aren't: sensations of itching that arise from nothing more than itchy thoughts; dreams that can seem indistinguishable from reality; phantom sensations that amputees have in their missing limbs.
The fact that Twitter continues to crash during times like this arises from nothing short of poor planning on the part of the company.
The cosmic microwave background (CMB) provides another remarkable result that is not only consistent with the idea of inflation, but is also highly suggestive that the universe itself could have arisen from nothing via quantum mechanical fluctuations in empty space.
More simply, if A then B; but not B, hence not A. One might, of course, challenge the implication: something might arise from nothing, even if there are no cases of chickens giving birth to horses.
Just as scientists in the 19th century figured out that energy can be neither created nor destroyed, many 20th century physicists came to the conclusion that information, too, cannot arise from nothing or be eradicated.
"How does something arise from nothing?", he asked about the existence of space and time.
So if Krauss wants us to take the idea that our universe could have arisen from nothing as a real possibility by only using physics, he must convince us how this "math" is not fiction (even if one argues it is only created by the mind) and how ultimate reality actually can be explained by this math-god.
What contemporary physics tells us about how a universe like ours might arise from almost nothing just fascinates me.
The new cosmology gave empirical validation to the notion of a creation event; it assigned a numerical estimate for when the arrow of time first took flight; and it eventually led to the breathtaking idea that everything in the universe could have arisen from literally nothing.
If our universe were to arise, literally, from nothing, by some quantum mechanical phenomenon, then we would expect the total energy to be zero at that time.
