منابع مشابه
first stars
The interstellar medium of low-metallicity systems undergoing star formation will show chemical abundance in-homogeneities due to supernova events enriching the medium on a local scale. If the star formation timescale is shorter than the timescale of mixing of the interstellar matter, the inhomo-geneities are reflected in the surface abundances of low-mass stars and thereby detailed information...
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How and when did the first generation of stars form at the end of the cosmic dark ages? Quite generically, within variants of the cold dark matter model of cosmological structure formation, the first sources of light are expected to form in ∼ 10M dark matter potential wells at redshifts z 20. I discuss the physical processes that govern the formation of the first stars. These so-called Populati...
متن کاملThe First Stars
■ Abstract We review recent theoretical results on the formation of the first stars in the universe, and emphasize related open questions. In particular, we discuss the initial conditions for Population III star formation, as given by variants of the cold dark matter cosmology. Numerical simulations have investigated the collapse and the fragmentation of metal-free gas, showing that the first s...
متن کاملGroups that Distribute over Stars
Suppose (S, ∗) is a mathematical structure on a set S. As examples, (S, ∗) might be a topological space on S, a topological group on S, an n-ary operator on S, an n-ary relation on S or a Steiner triple system on S. A similarity mapping on (S, ∗) is a permutation on S that preserves the structure of (S, ∗). Such mappings f : (S, ∗) → (S, ∗) are called by different names. As examples, f might be...
متن کاملThe First Stars and Quasars
The first star clusters and quasars resulted directly from the growth of linear density fluctuations in the early Universe. Since they emerged from a well-defined set of initial conditions, the interplay between observational data from the Next Generation Space Telescope (NGST) and theoretical modeling will advance the current understanding of star and quasar formation. The first objects had a ...
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ژورنال
عنوان ژورنال: Physics
سال: 2021
ISSN: 1943-2879
DOI: 10.1103/physics.14.s66