Could the cosmos be dominated by particles that move faster than the speed of light? This model of the universe agrees surprisingly well with observations, a pair of physicists has discovered.
The researchers calculate that an expanding universe filled with tachyons can initially slow down in its expansion before reaccelerating. Our universe is currently in an accelerating phase, driven by a phenomenon known as dark energy, so this tachyon cosmological model can potentially explain both dark energy and dark matter at the same time.
The physicists found that a tachyon cosmological model was just as good at explaining the supernova data as the standard cosmological model involving dark matter and dark energy. That itself is a surprise, given how unorthodox this idea is.
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