Stellar Signatures of Inhomogeneous Big Bang Nucleosynthesis
  We evaluate abundance anomalies generated in patches of the universe where
the baryon-to-photon ratio was locally enhanced by possibly many orders of
magnitude in the range $\eta = 10^{-10} - 10^{-1}$. Our study is motivated by
the possible survival of rare dense regions in the early universe, the most
extreme of which, above a critical threshold, collapsed to form primordial
black holes. If this occurred, one may expect there to also be a significant
population of early-forming stars that formed in similar but subthreshold
patches. We derive a range of element abundance signatures by performing BBN
simulations at high values of the baryon-to-photon ratio that may be detectable
in any surviving first generation stars of around a solar mass. Our predictions
apply to metal-poor galactic halo stars, to old globular star clusters and to
dwarf galaxies, and we compare with observations in each of these cases.
