Cosmology A Research Briefing (1995) / Chapter Skim
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I. OVERVIEW
I. OVERVIEW
Pages 1-12
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The radiation was dubbed the cosmic microwave background radiation (CMBR)
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The predicted abundances agree exquisitely with currently measured abundances of these elements! On less firm ground, but even more amazing, is the idea that the same CMBR lumps that acted as seeds for the formation of the large-scale structure can be traced back to quantum fluctuations occurring in the first billion billion billion billionth of a second after the Big Bang!
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As noted above, these calculations predict abundances that are in good agreement with the measured abundances oflight elements. The agreement holds, however, only on the assumption that the amount of ordinary matter present today is small, less than 20 percent of the amount of dark matter deduced from gravitational effects observed in today's universe.
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Cosmologists must rely heavily on special instrumentation to make very large sky surveys (encompassing a million galaxies!
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COSMOLOGY. A RESEARCH BRIEFING The Cosmic Picture Unseen universe Our causal horizon High-Energy Physics Era Radiation Era Matter Era Galaxies and large-scale structure Inflation Hellum forms Decoupilng occurs H]
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COSMOLOGY: A RESEARCH BRIEFING The Early Universe ....
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COSMOlOGY: ARESEARCHBRIEFING | - ~ it's ~ ~ ~ at -a ~O~',~-~y9~15 I; I ,j - Att= ~ ~ _~ _ ~; Am_ _~ ^d ~ ~affix Ii~ - S
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The initial results from the COBE satellite are encouraging, but a worldwide effort is under way to extend those results to smaller angles where unique signatures of the early universe may be found. The concepts of inflation and dark matter have revolutionized modern cosmology.
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indeed, large cosmological projects are now driving innovative hardware and software developments. For example, a new sky survey joins university astronomers with physicists at Fermi National Accelerator Laboratory, the latter contributing their special expertise in, and computer capability for, high-speed data processing.
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The need for better data has driven major improvements in technology, especially detectors and telescopes, and the volume of new data has led cosmologists to press hard on the boundaries of computation. The combination of basic knowledge, highly motivated young scientists, and a growing technology base offers an unprecedented opportunity for further progress.
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The cosmic microwave background radiation (CMBR) , discovered in 1964, is a telltale remnant of tile early universe.
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