![]() The second fragment, at a distance of approximately 800 astronomical units, is also optically thick to its own cooling radiation from molecular hydrogen lines but is still able to cool via collision-induced emission. Here, we discuss a cosmological simulation in which the central 50 M(o) (where M(o) is the mass of the Sun) clump breaks up into two cores having a mass ratio of two to one, with one fragment collapsing to densities of 10(-8) grams per cubic centimeter. Previous high-resolution cosmological simulations predicted that the first stars to appear in the early universe were very massive and formed in isolation. He was the director of the Kavli Institute for Particle Astrophysics and Cosmology and Division Director at SLAC 2013-2018. Most recently he is pioneering novel numerical algorithms to study collisionless fluids such as dark matter which makes up most of the mass in the Universe as well as astrophysical and terrestrial plasmas. His group studies any of the first objects to form in the universe: first stars, first supernovae, first HII regions, first magnetic fields, first heavy elements, and so on. He currently continues his work on the first stars and first galaxies and their role in chemical enrichment and cosmological reionization. He has shown from first principles that the very first luminous objects are very massive stars and has developed novel numerical algorithms using adaptive-mesh-refinement simulations that capture over 14 orders of magnitude in length and time scales. Abel's group explores the first billion years of cosmic history using ab initio supercomputer calculations. What were the first objects that formed in the Universe? Prof. Vice Provost for Undergraduate Education.Office of Vice President for Business Affairs and Chief Financial Officer.Office of VP for University Human Resources.Stanford Woods Institute for the Environment.Stanford Institute for Economic Policy Research (SIEPR). ![]() Institute for Stem Cell Biology and Regenerative Medicine.Institute for Human-Centered Artificial Intelligence (HAI).Institute for Computational and Mathematical Engineering (ICME).Freeman Spogli Institute for International Studies.Stanford Doerr School of Sustainability. ![]()
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