Exam and referat of Anastsia Kurova

[Nastya Kurova MEPhI]

Theme of my refeat is "Mirror world with SU(2)L+R"
Regards, Anastasia.

[Nastya Kurova MEPhI]

Btw here is the list of students who will attend your course in this semester:

Borodikhina Liudmila
Dmitriev Alexander
Kuznetsov Denis
Kurova Anastasia
Leonova Tatiana
Stukov Danila

[Maxim Khlopov]

Thank you,
I look forward to your first draft
Regards
M.Yu.Khlopov

[Nastya Kurova MEPhI]

Good evening!
Here is the fist draft of my small thesis in english.
Regards, Anastasia.

[Maxim Khlopov]

Dear Anastasia,
Thank you for draft.
There are many Grammar erros (some of which I have underlined). Typical error:
subject in plural and verb in singular (or vice versa) like
Mirror baryons contributes...
Please also use proper spelling of "baryosynthesis" or "nucleosynthesis"
My comments are in the attached file. I have simply underlined some sentences or pieces that should be stylistically corrected
With the best regards
M.Yu.Khlopov

[Nastya Kurova MEPhI]

Good afternoon, Maxim Yu.
I have a question maybe not much dedicated to the lecture: In your opinion, should all dark matter be explained by one model or mechanism? Or is it possible that DM could be separated in some parts that have different origins?
Thank you.
Regards, Anastasia.

[Maxim Khlopov]

Dear Anastasia,
Thank you for your question.
People look for a single form of dark matter (DM) for simplicity. However, we have different physical motivations for different DM candidates, what appeals to a multicomponent dark matter scenarios.
Different DM fractions may be comparable by their contribution into the total DM density, or there may be some dominant form of dark matter accompanied by (several?) sub-dominant components.
These components can be homogeneously mixed, or separated in space.
The separation in space may be due to domain structures of various kind, or (in the simplest case) due to the difference in DM particle properties - the simplest example is a mixture of Hot and Cold dark matter, the ratio of the corresponding fractions changes from large to small scales.
With the best regards
M.Yu.Khlopov

[Nastya Kurova MEPhI]

Thank you for your answer!
One more question about the referat: In the last draft you asked me about why I consider small masses of mirror neutrinoes if they can have arbitrary Dirac mass value? But I doesn't understand the purpouse of this question because in the introduction I mentioned that such a small masses come from cosmological restriction on the sum of all neutrino species masses.
Regards, Anastasia.

[Maxim Khlopov]

Dear Anastasia,
The existence of right handed mirror neutrino is a natural consequence of your model,
what should lead to a Dirac mass of neutrino comparable with the mass of the corresponding charged lepton.
Therefore, you should propose some mechanism to suppress cosmological effects of neutrinos, or
to explain, why the mass of neutrino is small
With the best regards
M.Yu.Khlopov

[Nastya Kurova MEPhI]

Good morning!
Here is corrected version of the draft.
Regards, Anastasia.