| Popis: |
The Big Bang has been typically identified as the beginning of the Universe: t = 0 if you extrapolate back our expanding Universe to a state of arbitrarily high temperatures and densities. While you can naively do exactly that in an expanding Universe under the rules of General Relativity, those conditions lead to observable effects that run contrary to what we see. Instead, the Universe is better described by cutting off the matter-and-radiation dominated Universe at some early time, patching on an inflationary epoch where space is expanding exponentially and dominated by some sort of vacuum energy. This is not mere theory nearly 40 years on, but is supported by a vast suite of observable evidence. The case for this conclusion, even in the absence of B-mode polarization in the CMB, is laid out here. |
