Editing Cosmology
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**What is the speed of the Earth around the sun? The Sun around the Galactic center? The Local Group with respect to the CMB? | **What is the speed of the Earth around the sun? The Sun around the Galactic center? The Local Group with respect to the CMB? | ||
− | *What sets the scale of the 1st Acoustic Peak in the CMB power spectrum? What's the sound speed in the photon baryon fluid? Derive the sound speed. Why is $P=1/3\rho$ for photons? Where does the 1/3 come from? | + | *What sets the scale of the 1st Acoustic Peak in the CMB power spectrum? What's the sound speed in the photon baryon fluid? Derive the sound speed. Why is $P=1/3\rho$ for photons? Where does the 1/3 come from? |
*WMAP often quotes an "optical depth to reionization." What is meant by this? Calculate this optical depth in terms of an integral over redshift. (MT) | *WMAP often quotes an "optical depth to reionization." What is meant by this? Calculate this optical depth in terms of an integral over redshift. (MT) |