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This could, for example, treat dark energy and dark matter as different facets of the same unknown substance, [55] or postulate that cold dark matter decays into dark energy. [56] Another class of theories that unifies dark matter and dark energy are suggested to be covariant theories of modified gravities.
Holographic dark energy models, compared with cosmological constant models, imply a high degeneracy. [clarification needed] [18] It has been suggested that dark energy might originate from quantum fluctuations of spacetime, and is limited by the event horizon of the universe. [19]
Michael S. Turner (born July 29, 1949) [1] is an American theoretical cosmologist who coined the term dark energy in 1998. [2] He is the Rauner Distinguished Service Professor Emeritus of Physics at the University of Chicago, [3] having previously served as the Bruce V. & Diana M. Rauner Distinguished Service Professor, [4] and as the assistant director for Mathematical and Physical Sciences ...
Freese has contributed to early research on dark matter and dark energy. She was one of the first to propose ways to discover dark matter. [ 7 ] Her idea of indirect detection in the Earth is being pursued by the IceCube Neutrino Observatory experiment, [ 8 ] and the "wind" of dark matter particles felt as the Earth orbits the Milky Way (work ...
Since the 1990s, studies have shown that, assuming the cosmological principle, around 68% of the mass–energy density of the universe can be attributed to dark energy. [6] [7] [8] The cosmological constant Λ is the simplest possible explanation for dark energy, and is used in the standard model of cosmology known as the ΛCDM model.
The fraction of the total energy density of our (flat or almost flat) universe that is dark energy, , is estimated to be 0.669 ± 0.038 based on the 2018 Dark Energy Survey results using Type Ia supernovae [7] or 0.6847 ± 0.0073 based on the 2018 release of Planck satellite data, or more than 68.3% (2018 estimate) of the mass–energy density ...
The modeled evolution of the universe includes a large amount of unknown matter and energy in order to agree with such observations. This energy density has two components: cold dark matter and dark energy. Each contributes to the theory of the origination of galaxies and the expansion of the universe.
Dark energy, however, is a substance or force responsible for the accelerating expansion of the universe over time. [2] The significant focus of The 4 Percent Universe is on the developments of astronomical science in the 20th century, including the formation of the expanding universe theory by Edwin Hubble in the 1930s.