Implications of a Primordial Origin for the Dispersion in D/H in Quasar Absorption Systems

Details Implications of a Primordial Origin for the Dispersion in D/H in Quasar Absorption Systems Implications of a Primordial Origin for the Dispersion in D/H in Quasar Absorption Systems

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pnas...95.2758c&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 95, Issue 6, pp. 2758-2760

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We explore the difficulties with a primordial origin of variations of D/H in quasar absorption systems. In particular we examine options such as a very large-scale inhomogeneity in the baryon content of the universe. We show that very large-scale (much larger than 1 Mpc) isocurvature perturbations are excluded by current cosmic microwave background observations. Smaller-scale ad hoc perturbations (~ 1 Mpc) still may lead to a large dispersion in primordial abundances but are subject to other constraints.

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