Cosmological Epochs in a nutshell
Very little is know about the Planck echo, which is expected to have occurred when the age of the universe was the planck time, 10^-43 seconds after the bang. This is area on which Stephen Hawking works. The time associated with the unflation epoch is also uncertain. Events durning inflation are less uncertain because their imprint can be observed today. The radiation and matter epochs are part of the standard cosmological model. Finally, the most recent epoch started when the mass-energy density of the universe became dominated by dark energy.
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