A volume containing a photon-baryon fluid is adiabatically expanded or compressed. The energy density of the...
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A volume containing a photon-baryon fluid is adiabatically expanded or compressed. The energy density of the fluid is e = E, + €bary, and the pressure is P = P, = 6/3. What is dP/de for the photon-baryon fluid? What is the sound speed, c,? In equation (12.27) of Ryden, how large of an error is made in the estimate of A,(before) by ignoring the effect of the baryons on the sound speed of the photon- baryon fluid? A volume containing a photon-baryon fluid is adiabatically expanded or compressed. The energy density of the fluid is e = E, + €bary, and the pressure is P = P, = 6/3. What is dP/de for the photon-baryon fluid? What is the sound speed, c,? In equation (12.27) of Ryden, how large of an error is made in the estimate of A,(before) by ignoring the effect of the baryons on the sound speed of the photon- baryon fluid?
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