Editing Cosmology
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*In the SNe Ia measurements of cosmic acceleration, how can we be sure our measurement hasn't been messed up by dust? | *In the SNe Ia measurements of cosmic acceleration, how can we be sure our measurement hasn't been messed up by dust? | ||
**Helping question: Sketch the plot that comes out of these measurements, including both the measured curves and the curves that one would get if there were no cosmic acceleration but simply dust extinction. | **Helping question: Sketch the plot that comes out of these measurements, including both the measured curves and the curves that one would get if there were no cosmic acceleration but simply dust extinction. | ||
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The following was asked by MT | The following was asked by MT | ||
* At what temperature did recombination happen? | * At what temperature did recombination happen? | ||
− | * why is this temperature different from 10,000K for which ionization happens in stars? | + | * why is this temperature different from 10,000K for which ionization |
+ | happens in stars? | ||
* What is the SZ effect? Can the photon lose energy to the electron? What is the use of the SZ effect in cosmology? What is the temp of the gas around a cluster where SZ effect is happening? What is the cross over frequency for it to occur? | * What is the SZ effect? Can the photon lose energy to the electron? What is the use of the SZ effect in cosmology? What is the temp of the gas around a cluster where SZ effect is happening? What is the cross over frequency for it to occur? | ||
* go back in time, when is the next change in the "chemistry" of the | * go back in time, when is the next change in the "chemistry" of the | ||
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*Draw a log-log diagram with X-axis to be scale factor of the universe and Y-axis to be the density. Plot the density evolution of the universe on the diagram. | *Draw a log-log diagram with X-axis to be scale factor of the universe and Y-axis to be the density. Plot the density evolution of the universe on the diagram. | ||
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