‘Elephant’ in the Cosmos –“Massive Gravity Replaces Dark Energy” (Weekend Feature)


Dark Energy


Dark energy has been described as everything from a fifth force to a new form of matter, but so far, no direct evidence has been found of its existence. “I have absolutely no clue what dark energy is,” says Noble Prize winning physicist Adam Riess . “Dark energy appears strong enough to push the entire universe – yet its source is unknown, its location is unknown and its physics are highly speculative.”


“Dark Matter Particles as Big as a Galaxy”


Hubble Image Dark Matter


“At first, we thought it was absurd,” said theoretical physicist Asimina Arvanitaki, at the Perimeter Institute for Theoretical Physics, who proposes that black holes can be thought of as nature’s particle accelerators, and how we may be able to discover new particles through detection of the gravitational waves black holes create. “I’m not surprised. How else could you respond to the idea that black holes generate swirling clouds of planet-sized particles that could be the dark matter thought to hold galaxies together? We tend to think about particles as being tiny but, theoretically, there is no reason they can’t be as big as a galaxy.”