Скачать с ютуб Professor Arthur Kosowsky, Dept. of Physics and Astronomy, University of Pittsburgh. Science Board в хорошем качестве

Professor Arthur Kosowsky, Dept. of Physics and Astronomy, University of Pittsburgh. Science Board

#cosmology #CosmicMicrowaveBackground #planet9 Professor Kosowsky serves on the Science Board of the Simons Observatory. He focuses on cosmology and related issues of theoretical physics. He's done extensive work on the theory of the cosmic microwave background radiation and the ways in which it constrains our models of the universe. Current microwave observations, combined with optical observations of the large-scale galaxy distribution, cosmic abundances of light elements, and the supernova-1a Hubble diagram, combine to give tight constraints on the properties of the universe. The resulting "standard model" fits most observations well, but is troubling theoretically: our best guess says that only 4 percent of the universe's energy density is in the form of ordinary matter, 26 percent is made of as-yet undetected dark matter (which does not interact either via the strong or electromagnetic forces), and the remaining 70 percent is in an even stranger "dark energy", evenly distributed in space and having a negative effective pressure. Theorists have a number of good candidates for the dark matter particles, which are currently being pursued by many experimental groups, including the high energy experiment group at Pitt. Current ideas as to the nature of dark energy are all highly speculative. In addition to the Simons Observatory, Professor Kosowsky is a member of the Atacama Cosmology Telescope (ACT) project, which built a custom-designed 6-meter microwave telescope with superconducting bolometric detectors to observe the microwave sky from the Atacama Desert in the Chilean Andes. ACT has produced microwave maps with arcminute angular resolution in three frequency bands. Notable ACT achievements have included the first direct detection of gravitational lensing of the cosmic microwave background radiation, the first detection of seven acoustic peaks in the microwave background power spectrum, improved constraints on the parameters describing the standard cosmology, the first detection of galaxy cluster motions via their imprint on the microwave background radiation, and detection of one of the earliest and largest galaxy clusters. https://www.physicsandastronomy.pitt....