Recent content by jacdiam89

Thank you for the 2 books, I'm trying to find some informations on the web, like the index, to see if there is a good exercise section.

Ok ok thank you, the website is interesting (it also gives a good explanation for frw metric etc). I realized is very difficult to find exercises with solutions, my book (Cosmologia e Cosmologie, Bonometto) has only theory, but my professor asks a lot of exercises in the exam. I have 3 or 4...

First of all, thank you, i did the substitution, now the integral is in da. I have problems using a_{0}. If i use the scale factor without it, the conclusions should be the same...i think! I mean, if z_{mis}=\frac{1}{a_{em}}-1 then a_{em} is \frac{a}{a_{0}}...

Hello, I'm looking for exercises and problems about the Friedmann equation. For example: calculate the redshift, H0, scale factor, temperature, horizons etc given the model of universe. Does anyone know some website, or professors homepages, in which i could find this stuff? Thank you :)...

Homework Statement Calculate the comobile distance of a galaxy with z=7.3, H_{0}=72 km/s/Mpc, universe with \Omega_{0}=\Omega_{0,m}=1 Calculate the scale factor when the galaxy emitted the light we receive today. Homework Equations Friedmann equation (\frac{\dot{a}}{a})^{2}=(H_{0})^{2}[...

Oh, good, I've found the \Sigma button above the text box. When i press this button a box appears with all the symbols. Problem solved! (\frac{\dot{a}}{a})^{2}=(H_{0})^{2}[...

Ok thank you, now i will try to write the Friedmann equation...

Hello! I'm new here, and i would like to konw how to write an equation in my post. For example, the Freidmann equation. Do i need a particular software or there is a function to do it while I'm writing the post in the forum? Wich are the steps? Thank you Jacopo (sorry for my...