Measuring CMB Anisotropies-WMAP Results and Planck

Measuring CMB Anisotropies-WMAP Results and Planck -...

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Unformatted text preview: Measuring CMB Anisotropies- WMAP Results and Planck Expectations Cosmic Microwave Background • Discovered in 1965 by Penzias and Wilson • Near perfect blackbody with T=2.725K, peaks at 160GHz • Isotropic to 1 part in 100,000 • Originates at era of recombination/decoupling First-Year WMAP Data From http://map.gsfc.nasa.gov Anisotropies in the CMB • Primary Anisotropies (large angular scales) – Sachs-Wolfe effect – Doppler shift – Acoustic peaks • Secondary Anisotropies (small angular scales) – Integrated Sachs-Wolfe – Thermal Sunyaev-Zeldovich effect – Kinetic Sunyaev-Zeldovich effect Sunyaev-Zeldovich (SZ) Effect • Thermal effect – Inverse Compton scattering off thermal electron populations – Amplitude proportional to temperature – Shape of spectrum fixed • Kinetic effect – Doppler shift due to moving electron populations Angular Power Spectrum • Temperature anisotropies expressed in spherical harmonic expansion • Angular Correlation Function ∑ ∑...
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Measuring CMB Anisotropies-WMAP Results and Planck -...

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