Referat and Exam of Ilya Bysha

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Referat and Exam of Ilya Bysha

New postby Bysha [Mephi] on Sat 7 Jan 2012 18:47

Максим Юрьевич, я долго выбирал между следующими тремя темами:
1)mirrow world with mn<mp-me
2)mirrow world with mp-me<mn<mp
3)mirrow world with mn=mp
Не хотел сразу останавливаться на одной из них. Но в конце концов выбрал ту, которая лично мне приглянулась больше в плане анализа данных, полученных в результате построения выбранной модели зеркального мира.
С нетерпением жду ваших замечаний.
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Re: Referat (Bysha Ilya)

New postby Maxim Khlopov on Sun 8 Jan 2012 14:53

Thank you.
You should describe particle content and interactions in your mirror world and discuss what forms of dark matter are expected in it.
Please remove the unnecessary discussions
My comments in the attached text
Regards
M.Yu.Khlopov
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Re: Referat (Bysha Ilya)

New postby Bysha [Mephi] on Wed 11 Jan 2012 11:29

Вторая версия реферата.
Постарался учесть все замечания.
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Re: Referat (Bysha Ilya)

New postby Maxim Khlopov on Wed 11 Jan 2012 14:04

You are close to finish. My comments in the attached text
Regards
M.Yu.Khlopov
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Re: Referat (Bysha Ilya)

New postby Bysha [Mephi] on Wed 11 Jan 2012 16:16

Максим Юрьевич, я не совсем понимаю, что вы имели в виду, когда спрашивали об оценке "закаленной концентрации водорода и дейтерия". Что фактически означает это понятие? Моменты выхода из равновесия прямой и обратной реакций, обуславливающих, собственно, равновесие? В случае с дейтерием это момент, который определяется температурой 0.1 Мэв, или это неверно?
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Re: Referat (Bysha Ilya)

New postby Maxim Khlopov on Wed 11 Jan 2012 17:27

Dear Ilya,
If you consider expanding Universe, you can never bind all particles: when the rate of their binding becomes equal to the rate of expansion, some fraction of particles remains free.
You wrote that the amount of free protons is zero. Strictly speaking it is not true, since a small (exponentially small - due to excess of neutrons) fraction still remains free.
Please skip the case of deuterium and estimate only the amount of free protons.
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M.Yu.Khlopov
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Re: Referat (Bysha Ilya)

New postby Bysha [Mephi] on Thu 12 Jan 2012 12:31

Третья версия реферата. Постарался ответить на все вопросы.
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Re: Referat (Bysha Ilya)

New postby Maxim Khlopov on Thu 12 Jan 2012 13:51

Dear Ilya,
Your attempts deserve admittance to exam, though your calculations of frozen out abundances are not correct.
I propose to correct estimation of frozen out free p and remove successive discussion of freezing out of other nuclei.
You should also correct Bibliography, as noted in the attached text.
I wait for the final version to admit you to exam tomorrow
Regards
M.Yu.Khlopov
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Re: Referat (Bysha Ilya)

New postby Bysha [Mephi] on Thu 12 Jan 2012 14:18

Максим Юрьевич, в соотношении "n_n sigma v t =1" что подразумевается под t?
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Re: Referat (Bysha Ilya)

New postby Maxim Khlopov on Thu 12 Jan 2012 14:45

Cosmological time in the period of freezing out of free protons.
It is approximately 1/H, H- rate of cosmological expansion in this period
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