Oleg Gnedin

I am an associate professor in Department of Astronomy at University of Michigan. I study the formation and evolution of galaxies and star clusters. I also investigate exotic neutron stars and the nature of dark matter. Some of the current projects are listed below.

Galaxy Formation   Models based on cold dark matter and dark energy predict many more satellite halos than existing dwarf galaxies in the Local Group. This "missing satellites problem" may be resolved by considering inefficient cooling of gas in small dark matter halos. Observations show that many dwarf galaxies exhibit extended star formation histories continuing well after hydrogen reionization. It remains a challenge for the models to reproduce these star formation histories in detail.
Globular Clusters   Globular star clusters are remnants of early bursts of star formation in galaxies. They form in giant molecular clouds, following gas-rich galactic mergers. Only massive clusters survive the dynamical evolution to be observed now, while low-mass clusters gradually dissolve. It remains a challenge for a self-consistent model to reproduce the observed spatial and metallicity distributions of globular clusters.
Clusters of Galaxies   Galaxies never stop to change. Their properties evolve continuously as a result of star formation, stellar evolution, merging and interactions with their neighbors. The latter effect is particularly strong in galaxy clusters, where galaxies transform from disk to spheroidal types. It remains a challenge to quantify the evolution of galaxies due to the effects of tidal interactions, ram pressure of intracluster gas, and stellar and AGN feedback.

A code for calculating the contraction of dark matter halos in response to condensation of baryons
A code for calculating multimodality of a univariate distribution