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Nikolai Kitanine

@kitanine.bsky.social

Professor of Mathematical Physics, Université de Bourgogne, France

23 Followers  |  76 Following  |  5 Posts  |  Joined: 10.11.2024  |  1.7101

Latest posts by kitanine.bsky.social on Bluesky

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Mediazona on the brink. We need 5,000 monthly subscribers to survive Mediazona is running out of money. We’ve had to cut staff and slash salaries. Editor-in-chief Sergey Smirnov and editor Dmitry Treshchanin will now be working without pay. If thing...

THIS IS AN EMERGENCY. Mediazona is struggling.

We’ve tracked 100K Russian casualties in Ukraine. Covered political prisoners repression. We survived Putin’s censors.

Our reporters risk prison. Our editors will now work without pay. We need your help: en.zona.media/article/2025...

31.03.2025 14:13 — 👍 82    🔁 53    💬 1    📌 17
Boundary quantum phase transitions in the spin-$\frac{1}{2}$ Heisenberg chain with boundary magnetic fields We consider the spin-$1/2$ Heisenberg chain with boundary magnetic fields and analyze it using a combination of Bethe ansatz and density matrix renormalization group (DMRG) techniques. We show that th...

There is a very nice example where it happens

doi.org/10.1103/Phys...

17.02.2025 15:34 — 👍 2    🔁 0    💬 1    📌 0

Theoretically yes. One can define the state of thermal equilibrium with density matrix \exp(-\beta H)

19.12.2024 19:36 — 👍 0    🔁 0    💬 0    📌 0

It is a good general rule of thumb that the people who repeat "science is political" as a self-evident mantra that requires no definition of what they mean by "science" or "political", really mean that science should be distorted to conform to THEIR politics.

03.12.2024 12:51 — 👍 11    🔁 3    💬 3    📌 0
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Played this game with a predictable result

25.11.2024 09:29 — 👍 3    🔁 0    💬 0    📌 0
SciPost SciPost

SciPost is in danger of going out of business: instead of paying APCs, support a virtuous publisher! #OpenAccess #DiamondOA
scipost.org/blog/post/20...

15.11.2024 16:08 — 👍 1    🔁 2    💬 0    📌 0

Oui

18.11.2024 11:51 — 👍 1    🔁 0    💬 0    📌 0

A lot of people are joining bsky, so this starter pack (despite being just a couple of weeks old) is now rather outdated. It is (I hope) still a decent starting point, but if you should be on it and I missed you, just let me know.
go.bsky.app/CH3YDz7

16.11.2024 10:30 — 👍 43    🔁 13    💬 16    📌 2

It converges rapidly to the simple question “do I know the sender?”

15.11.2024 12:29 — 👍 1    🔁 0    💬 0    📌 0

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