We present the results from cosmological hydrodynamic
simulations of early structure formation in a LCDM universe.
We study the so-called feedback effects from the first
generation of stars. The first stars photo-ionize and heat
the inter-galactic medium. They can also input energy by
exploding as supernovae.
These altogether cause a delay of star-formation in early
proto-galaxies. We show that even a single massive star
can delay/quench subsequent star-formation for several tens
to a hundred million years.
The thermal and chemical evolution of a photo-ionized gas
differs significantly from that of an initially neutral
primordial gas. We argue that massive, rather than very massive,
primordial stars can be formed in early proto-galaxies.
We discuss the role of heavy elements and dust in
the formation process of second-generation stars.
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