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How Did the First Stars and Galaxies Form? by Abraham Loeb

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THE FIRST STARS AND BLACK HOLES

There are two branches of theoretical research in cosmology. One considers the global properties of the Universe and the physical principles that govern it. As more data come in, our knowledge of the initial conditions as well as the underlying cosmological parameters gets refined with higher and higher precision. The second branch focuses on the formation of observable (luminous) objects out of the cosmic gas, including the stars and black holes in galaxies. Here, as more data come in, the models get more complex and the modelers understand more clearly why their previous analysis oversimplified the underlying processes. Theorists who work in the first branch run the risk of needing to switch fields in the future ...

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