A theory of dark matter which was promising up to the late 1990s.
"Mixed" dark matter is also called Hot + Cold Dark Matter. Hot Dark matter has only one known form - neutrinos, although other forms are speculated to exist. Cosmologically important dark matter is now believed to be pure Cold Dark Matter. However, in the early 1990s the power spectrum of fluctuations in the galaxy clustering did not agree entirely with the predictions for a standard cosmology built around pure Cold Dark Matter. Mixed Dark Matter with a composition of about 80% cold and 20% hot (neutrinos) was investigated and found to agree better with observations. This model was made obsolete by the discovery in 1998 of the acceleration of universal expansion, which eventually led to the Dark Energy + Dark Matter paradigm of this decade.
Famous quotes containing the words mixed, dark and/or matter:
“It is not too much to say that next after the passion to learn there is no quality so indispensable to the successful prosecution of science as imagination. Find me a people whose early medicine is not mixed up with magic and incantations, and I will find you a people devoid of all scientific ability.”
—Charles Sanders Peirce (1839–1914)
“Since the war nothing is so really frightening not the dark not alone in a room or anything on a road or a dog or a moon but two things, yes, indigestion and high places they are frightening.”
—Gertrude Stein (1874–1946)
“One of the most significant effects of age-segregation in our society has been the isolation of children from the world of work. Whereas in the past children not only saw what their parents did for a living but even shared substantially in the task, many children nowadays have only a vague notion of the nature of the parent’s job, and have had little or no opportunity to observe the parent, or for that matter any other adult, when he is fully engaged in his work.”
—Urie Bronfenbrenner (b. 1917)