Referat and Exam of Dmitry Pugachev

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Re: Referat and Exam of Dmitry Pugachev

New postby DPugachevMephi on Thu 8 Jan 2015 23:52

Максим Юрьевич,
прикрепляю обновленную версию.
С уважением,
Д. Пугачев.
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Re: Referat and Exam of Dmitry Pugachev

New postby Maxim Khlopov on Sat 10 Jan 2015 16:19

Dear Dmitry,
You have started to late to consider all the interesting features of your model.
So to come to some logical end, let's consider correctly a simle case of charge symmetric mirror world.
You should accurately check, what is the abundance of nucleon-antinucleon pairs (electron-positron-pairs) in this case and study, whether processes of nucleosythesis, recombination and gravitation instability can take place in such scenario. What kind of dark matter objects can be formed (or not) in your scenario?
My comments are in the attached file
Regards
M.Yu.Khlopov
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Re: Referat and Exam of Dmitry Pugachev

New postby DPugachevMephi on Sun 11 Jan 2015 00:40

Максим Юрьевич, прикрепляю новую версию.
С уважением,
Д. Пугачёв
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Re: Referat and Exam of Dmitry Pugachev

New postby Maxim Khlopov on Sun 11 Jan 2015 11:03

You have charge symmetric case: equal number of mirror nucleons and antinucleons.
Please, consider freezing out of nucleon pairs, calculate their frozen our abundance and come to conclusions about nucleosynthesis, recombination and gravitational instability for baryon symmetric mirror world.
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Re: Referat and Exam of Dmitry Pugachev

New postby DPugachevMephi on Sun 11 Jan 2015 11:13

Оценка, которую я провел в версии 5, неправильная?
Получил, что скорость реакции образования дейтерия практически равна темпу расширения Вселенной. Из этого можно сделать вывод, что нуклеосинтез в зеркальном мире не будет происходить.
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Re: Referat and Exam of Dmitry Pugachev

New postby Maxim Khlopov on Sun 11 Jan 2015 11:18

You don't give the value of n_b, which should be determined from freezing out of nucleon-antinucleon pairs in baryon symmetric mirror world
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Re: Referat and Exam of Dmitry Pugachev

New postby DPugachevMephi on Sun 11 Jan 2015 11:21

В конце раздела "Закалка частиц" приведено данное значение
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Re: Referat and Exam of Dmitry Pugachev

New postby Maxim Khlopov on Sun 11 Jan 2015 11:33

Pleaqe check it, taking into account that nucleon freezing out is determined by strong interaction
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Re: Referat and Exam of Dmitry Pugachev

New postby DPugachevMephi on Sun 11 Jan 2015 13:06

Я пересчитал закаленную концентрацию нуклонов. При новом значении процесс нуклеосинтеза будет иметь место. Поясните, пожалуйста, как, опираясь на заколенное значение нуклонов, можно сделать заключение о рекомбинации и гравитационной нейустойчивости в барионно-симметрочном зеркальном мире.
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Re: Referat and Exam of Dmitry Pugachev - admission

New postby Maxim Khlopov on Sun 11 Jan 2015 14:52

Dear Dmitry,
My guess is that taking into account strong cross section for nucleon-antinucleon annihilation (and for charged pions annihilation to neutral pion pairs) your frozen our concentration will be so small that the rate of nuclear reactions and of recombination (for which you should also calculate frozen out concentration for mirror electron-positron pairs) will be much smaller, than the rate of expansion in the corresponding periods, as well as their contribution into the total density will be not sufficient to provide matter dominated stage and development of gravitational instability (growth of small density fulctuations)
We have no time to continue work on your text, soi you are admitted to exam, provided that you prepare these calculations as addtional questions to your ticket.
Regards
M.Yu.Khlopov
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