The next piece of evidence we will consider for the beginning of the universe is the Second Law of Thermodynamics. I sometimes call this the "Ordinary Second Law" to distinguish it from the "Generalized Second Law" which involves black holes … Continue reading
Having pointed out that the BVG theorem presupposes the existence of a classical spacetime, Carroll goes on to cite some evidence that the universe did not have a beginning, based on quantum mechanics (QM): If you need to invoke a … Continue reading
There is a theorem due to Borde, Guth, and Vilenkin which might be taken as evidence for a beginning of time. Roughly speaking, this theorem says that in any expanding cosmology, spacetime has to be incomplete to the past. In … Continue reading
Our best theory of gravity is classical General Relativity. "Classical" is physics-speak for not taking into account quantum mechanics. So we know that classical GR has to break down during the Planck era, if not later. Classical Big Bang cosmology … Continue reading
The next topic from the Carroll-Craig debate which I wish to discuss is what Science has to say about whether or not there was a beginning. Was there a first moment of time, before which the universe did not exist? … Continue reading
