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Deuterium has a special place in cosmology, nuclear astroph ysics, and galactic chemical evolution, because of its unique property that it is only created i n the big bang nucleosynthesis while all other processes result in its net destruction. However, a large scatter found in the interstellar medium (ISM) deuterium abundance measurements indicates t hat deuterium might be preferentially depleted onto dust grains, which complicates the use of deuterium as a probe of galactic chemical evolution (GCE) models. We have applied a model-in dependent, statistical Bayesian method and determined the true, undepleted ISM D abundance. Having found the ISM D abundance, one can identify the successful GCE models, which can then be used to learn about nucleosynthesis in the ISM, but can also be placed in cosmologi cal context to learn about the infall rates of the primordial gas to our Galaxy, which bares implic ations for models of galaxy formation. Here we present our results and their implications f r discriminating between different GCE models, for our understanding of the nature and physics o f interstellar dust grains, as well as implications for cosmological evolution.

Deuterium Link: From Interstellar Medium and Chemical Evolution to Cosmology and Structure Formation