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COSMIC MICROWAVE BACKGROUND RADIATION
Sean Morrison 9/16/2011
Graduate Seminar PHYS 730
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Introduction
The Big Bang Blackbody Radiation What is Cosmic Microwave
Background Radiation?
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The Primordial Fireball
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Outline
Early History and Discovery Early Research FIRAS DMR COBE Results Post-COBE Research Improvements of Cosmological
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Early History and Discovery Arno Penzias and
Robert Wilson Bell Lab’s Echo ~3K 1964
Robert Dicke Princeton University Big Bang
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Early Research The DMR and U2 Balloon-Borne
Anisotropy Experiment
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COBE: FIRAS Measure Spectral
Distribution 2 Beam
Interferometer 0.1 – 10mm Black Body Curve
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COBE: DMR Search for
Anisotropies 3.3mm, 5.7mm, and
9.5mm (90, 53, 31.5 GHz)
7o Angular Resolution
3 sets of 2 corrugated horns at 60o
Liquid He Cooled 8 Morrison Graduate Seminar PHYS 730
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COBE Results: FIRAS 2.725 ± 0.002 K
○ One of the best determined cosmological parameters
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€
T =bλmax
€
Tthen = 1+ z( )Tnow
€
B λ( ) =8πhc 2
λ5dλ
ehckT −1
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COBE Results: DMR Isotropic
Dipole temperature anisotropy - 3.358±0.017 mK
3D density fluctuations give rise to 2D temp anisotropies
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Post-COBE: Maxima & Boomerang
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Post-COBE: WMAP & ACBAR
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Improvements of Cosmological Constants Hubble Constant Reduced Hubble parameter Scalar Spectral Index Baryon Density Dark energy Density Matter density Age of the Universe Reionization Optical Depth
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Summery of Results
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Conclusions 2.725 ± 0.002 K
Blackbody Strong evidence for
and improvements of the Big Bang Theory
Improvements of the Cosmological Constants
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References “WMAP: Wilkinson Microwave Anisotropy Probe”. nasa.gov. 13
Sep 2011 http://map.gsfc.nasa.gov/ “Maxima: Millimeter Anisotropy Experiment Imaging Array”.
Cosmology. University of California Berkeley. 13 Sep 2011 http://cosmology.berkeley.edu/group/cmb/image/mbdcd+fit.jpg
“ACBAR: Arcminute Cosmology Bolometer Array Receiver”. University of California Berkeley. 13 Sep 2011 http://cosmology.berkeley.edu/group/swlh/acbar/index.html
“Penzias and Wilson discover cosmic microwave radiation:1965”. A Science Odyssey: People and Discoveries. 13 Sep 2011 http://www.pbs.org/wgbh/aso/databank/entries/dp65co.html
"George F. Smoot - Nobel Lecture". Nobelprize.org. 13 Sep 2011 http://www.nobelprize.org/nobel_prizes/physics/laureates/2006/smoot-lecture.html
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