Mathematics – Logic
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..903s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.4/AUG15, P. 903, 1993
Mathematics
Logic
2
Scientific paper
Sciama has attributed the ionization of diffuse interstellar gas and intergalactic clouds to a UV background arising from the decay of ~30-eV primordial neutrinos on a time-scale of ~10^23^ s. Cosmological structure forms as in any hot dark matter model, and the existence of non-linear structure at redshifts of ~5 then requires the presence of non-adiabatic or non-Gaussian perturbations on galactic scales. This hypothesis is testable through the emission of photons of a well-defined energy from the dark matter, which may be detectable wherever structure has developed. Non-detections from clusters of galaxies argue strongly against the decaying dark matter model, but debate about the distribution of dark matter within clusters makes the interpretation of the data inconclusive. Independent evidence against the hypothesis comes from two ways of studying the radiation background at visible and ultraviolet wavelengths: null results from searches for Ly α-emitting objects at high redshift are in conflict with the model if galaxy-sized seeds have already collapsed by z ~ 5; while a less model-dependent constraint comes from upper limits on background light fluctuations at linear scales.
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