After neutral atoms form, owing to the Universe cooling to below a certain, critical threshold, the photons simply travel in a straight line, affected only in wavelength by the expansion of space. electrons (and to a lesser extent, protons) at a very high rate, transferring momentum when they do. In the hot, early Universe, prior to the formation of neutral atoms, photons scatter off of.
Cosmic view cycle soothe reddit free#
When this last stage occurs, the photons permeating the Universe, which had previously scattered off of the free electrons, simply travel in a straight line, lengthening in wavelength and diluting in number as the Universe expands. And approximately 380,000 years after the Big Bang, it becomes cool enough to form neutral, stable atoms without them being instantly blasted apart.Gravitation works to grow the overdense regions, while radiation pressure works to expand them when they get too dense, creating a set of oscillatory, scale-dependent imprints.Protons and neutrons fuse to form the light nuclei: deuterium, helium-3, helium-4, and lithium-7.Neutrinos stop interacting efficiently with the surviving particles.Quarks and gluons condense to form composite particles like protons and neutrons.The electroweak and Higgs symmetries break when the Universe cools below the energy at which those symmetries are restored, creating four fundamental forces and particles with non-zero rest masses.All the possible particles and antiparticles would get created in great numbers, with the excess annihilating away to radiation when it gets too cool to continually create them.
If this were an accurate depiction of the Universe - that it began hot and dense and then expanded and cooled - we’d expect a large number of transitions to occur in our past history.
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