Alkuräjähdysnukleosynteesi

Alkuräjähdysnu refers to the hypothetical initial moment or state preceding the Big Bang, the prevailing cosmological model for the universe's origin. While the Big Bang describes the universe's expansion from an extremely hot, dense state, Alkuräjähdysnu delves into what, if anything, existed before this epoch. Current scientific understanding, particularly within general relativity, encounters limitations when trying to describe conditions at or before the Big Bang singularity. The extreme conditions involve infinite density and temperature, which are beyond the scope of known physics.

Various theoretical frameworks attempt to address the question of Alkuräjähdysnu. These include ideas such as cyclic universes, where the universe undergoes endless cycles of expansion and contraction, or models proposing a pre-existing state from which the Big Bang emerged. Quantum cosmology also explores possibilities, suggesting that quantum fluctuations in a pre-existing vacuum or a different phase of reality could have triggered the Big Bang. However, definitive observational evidence or a complete theoretical consensus on Alkuräjähdysnu remains elusive, making it an active area of research and speculation in theoretical physics and cosmology.