They then go on to explore the idea of some kind of exotic dark matter. One that has a changeable equation of state (EOS). To match observation, the dark matter EOS must oscillate in time.

This paper provides concrete evidence that the expanding and accelerating Universe mathematically expressed by dark energy is ...

The universe seems to be spinning, and that could explain what dark energy is and why it's weakening while revealing our place within the multiverse.

"The first box uses a Lambda CDM cosmology, while the second box contains a dark energy equation of state w, which evolves in time." The values of cosmological parameters are based on DESI's year ...

The biggest news in cosmology in recent years is that the mysterious universe-accelerating entity we call dark energy may be fading away. The evidence for this is now strong enough that enormous ...

PARIS - Dark energy, the mysterious force thought to be driving the ever-faster expansion of the universe, appears to be changing over time, according to new observations released Wednesday.

Dark energy is one of the most mysterious features of our universe – we don’t know what it is, but it controls how the universe is expanding, as well as its ultimate fate.

The discovery of Dark Energy in 1998 was in itself shocking. Up until then the view had been that after the Big Bang, which created the Universe, its expansion would slow down under the force of ...

China's National Astronomical Observatories holds a press conference for a major scientific breakthrough in the study of dark energy in Beijing on April 9, 2025. Photo: Deng Xiaoci/GT China's ...