General feedback on milestone II_澳门葡京手机版app下载

hansw
2024-04-05T13:26:59.117Z
type:structured-message
www.uio.no

It was generally better on all aspects than last time which is good. Here is just a few points to keep in mind:

Some of you write that recombination happens as soon as k_b T = 13.6 eV, but actually it happens when k_b T ~ 0.3 eV or so. Remember that the photons have a Planck distribution so there will be photons with high energy even though the mean temperature is less than 13.6 eV. And since there is almost a billion photons per baryon (n_photon / n_baryon ~10^9) in our Universe there will be enough photons with high energy to delay it significantly.

When it comes to the approximation sqrt(1+x) = 1 + x/2. Remember that the error is O(x^2) so if you apply this when |x| < eps then the error is ~eps^2. Some used eps = 0.1 which is way too high.

Remember to always give some physical insight into the quantities you are introducing, if possible, like tau, g, r_s. Most of you do a good job here.

Regarding last scat...