We have already entered the 6th and final era of our universe
, since the number density is the number of particles divided by volume, and the energy of each individual photon stretches as the Universe expands, adding an additional factor of 1/and dark energy is a property of space itself, so its energy density remains constant , irrespective of the Universe's expansion or volume.
We already entered this final era billions of years ago. Most of the important events that will define our Universe's history have already occurred. It expanded a small, causally connected patch of the Universe to one much larger than our presently visible Universe: larger than the current causal horizon.
At the high temperatures achieved in the very young Universe, not only can particles and photons be spontaneously created, given enough energy, but also antiparticles and unstable particles as well, resulting in a primordial particle-and-antiparticle soup. Yet even with these conditions, only a few specific states, or particles, can emerge.. Once the expanding Universe is filled with matter, antimatter and radiation, it's going to cool.
Schematic diagram of the Universe's history, highlighting reionization. Before stars or galaxies formed, the Universe was full of light-blocking, neutral atoms. While most of the Universe doesn't become reionized until 550 million years afterwards, with some regions achieving full reionization earlier and others later.
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