Unstable neutrinos can do it! |
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Authors: | M M Vasanthi |
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Institution: | (1) Tata Institute of Fundamental Research, Homi Bhabha Road, 400 005 Bombay, India |
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Abstract: | We present a cosmological scenario with unstable neutrinos which decay into a light neutrino and a relativistic boson. Theoretical and observational constraints severely narrow the values of mass and of lifetime of neutrinos. However, within this range, we can construct models with (i) = 1, (ii) age of the universe 13 billion years (b.y.) and (iii)h
0 –0.5. The dynamical modeling shows that (a) the initial condensates of primordial
L are disrupted by the decay, lowering their masses to acceptable values ~1012 M, (b) the relativistic boson contributes nearly 0.25 to, and (c) there emerge two prominent scales in dark matter distribution, one with a mass ~1012 M distributed over 200 kpc around galaxies and another component with density 10–27 g cm–3 distributed over 1 Mpc. The model agrees with observations at all scales.This essay received an honorable mention from the Gravity Research Foundation for 1986-Ed. |
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