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Tuesday, February 24, 2026

Seminars Digest, Vol 82, Issue 7

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Today's Topics:

1. Friday 27.02.2026 (info+seminars@itp.ac.ru)
2. Thursday 26.02.2026 - ITP/CAS Colloquium (info+seminars@itp.ac.ru)

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Message: 1
Date: Tue, 24 Feb 2026 07:02:02 +0000
From: info+seminars@itp.ac.ru
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 27.02.2026
Message-ID: <DcXDX6OywG1TCGFZwUVQHdv3BuH3c8zuW9MMXwa6zAY@wwwserv2>
Content-Type: text/plain; charset=UTF-8

Уважаемые коллеги!

На заседании Ученого совета ИТФ в пятницу 27.02 будут заслушаны 2 доклада:
11:30 Дмитрий Смирнов (ФТИ им. А.Ф. Иоффе)
Квантовое обратное действие при оптическом измерении локализованных спинов в полупроводниках (по материалам докторской диссертации)

Квантовое обратное действие, неизбежно возникающее при измерениях, часто описывается лишь феноменологически. Мы построили микроскопическую теорию оптических измерений спинов локализованных электронов в квантовых точках. Вычислен феноменологический параметр "силы измерений" для одиночной точки в нульмерном оптическом микрорезонаторе, а также для ансамбля квантовых точек. Показано, что измерения могут приводить как к замедлению, так и к ускорению спиновой дефазировки электронов в случайном поле ядер кристаллической решётки, что соответствует режимам квантовых эффектов Зенона и анти-Зенона. Оба эти режима удалось реализовать экспериментально для электронов, локализованных на донорах и в квантовых точках.

По материалам докторской диссертации (см. приложенный файл ниже).
ИТФ им. Л.Д. Ландау просят выступить в качестве ведущей организации.

12:45 Каркарьян Е.К. (ФИАН)
Рождение заряженных лептонов в протон-протонных столкновениях на БАК (по материалам кандидатской диссертации))

В докладе изучается рождение пар мюонов в протон-протонных столкновениях на Большом Адронном Коллайдере. Задача представляет интерес с двух точек зрения. Во-первых, это проверка предсказаний Стандартной Модели на эксперименте. Во-вторых, тяжелые частицы возможной Новой Физики могут проявляться во взаимодействиях при высоких энергиях. Рассматривается как квазиупругое, так и неупругое рассеяние протонов. Выводятся аналитические выражения для соответствующих сечений рождения мюонов. Интегрирование теоретических формул проводится по фазовому объему с учетом ограничений эксперимента ATLAS. Также исследуется вклад слабого взаимодействия в неупругую часть сечения рождения лептонов в столкновении протонов.

ID и пароль онлайн-трансляций в Zoom те же, что и для предыдущих трансляций семинаров и докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319

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Message: 2
Date: Tue, 24 Feb 2026 07:02:03 +0000
From: info+seminars@itp.ac.ru
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Thursday 26.02.2026 - ITP/CAS
Colloquium
Message-ID: <hFfGy2tui9KULHGBusbdJjxwQwFYroaEZkeaVrZ1wPE@wwwserv2>
Content-Type: text/plain; charset=UTF-8

Уважаемые коллеги!

На онлайн коллоквиум по теоретической физике в четверг 26.02 будут заслушаны 2 доклада:

1) 10:00:00 по московскому времени: Sergei S. Vergeles (L. D. Landau Institute for Theoretical Physics, Russian Academy of Sciences)
Hydrodynamics of rotating fluid

This work examines the maintenance of geostrophic, long-lived vortices through absorption of inertial waves. Such flows occur in a uniformly rotating fluid. To provide context, we first review turbulent flows in two- and nonrotating three-dimensional systems. Three-dimensional turbulent flow is characterized by a direct energy cascade, when energy without losses is transferred down the chain from larger to smaller scales. When dissipation is not relevant, in addition to the energy, two-dimensional flow conserves enstrophy. This additional conservation law drastically differs the statistical properties of two-dimensional turbulence, making the energy cascade inverse. This means that the energy is transferred to the largest scales, that under certain conditions leads to the self-organization of large, long-lived vortices. Rotating flow, in a sense, combines properties of both two- and three-dimensional systems and introduces unique new characteristics. The geostrophic part of the rotating flow is uniform along the rotation axis and resembles the two-dimensional flow. Inertial wave constitutes the part of the flow which is inhomogeneous along the rotation axis. However, if the flow is too intensive, it restores into three-dimensional turbulence. In number experiments and numerical simulations, long-lived, or coherent geostrophic vortices are observed against a background of turbulent flow. Analysis of the numerical data shows that the vortices gain energy from the turbulence. Here we analytically consider a process of inertial wave absorption by an axially symmetric geostrophic flow. We show that a monochromatic wave does not exert any torque on the vortex flow in the inviscid limit until it is absorbed inside its critical layer. Among convergent waves, those only are absorbed, which carry angular momentum of the same sign as one's of the rotation in the vortex. Convergent waves with the opposite sign of angular momentum are just reflected from the vortex. The wave absorption is possible only if the vortex flow is characterized by fast enough angular velocity there. Based on the results, we provide qualitative picture of the phenomenon.

Sergei Vergeles was born in 1982. Entered Moscow Institute of Physics and Technology in 1999. He defended his PhD thesis on the topic "Rheological properties of a vesicular suspension" in 2008 under the supervision of Lebedev Vladimir Valentinovich at Landau Institute for Theoretical Physics. After that, he became a researcher in the Landau Institute and the main topics of his interest were fibre optics, surface waves interaction with near-surface flows, and turbulent flow of rotating fluid. In 2025, Sergei Vergeles has defended his doctoral dissertation on the topic "Generation of coherent flows by regular and chaotic sources". He is a lecturer of the courses "Hydrodynamics" and "Electrodynamics of continuous media".

Time: Feb. 26, 2026 3:00 PM (Beijing) / 10:00 AM (Moscow)
Zoom: 898 3467 5707 Passcode: 118954

2) 11:00:00 по московскому времени: Fanlong Meng (Institute of Theoretical Physics, Chinese Academy of Sciences)
Hydrodynamically mediated collective dynamics: cilia synchronisation and multiflagellated microswimming

I will present our recent works on (1) how cilia can coordinate with each other to beat in the form of the metachronal wave, and (2) how hydrodynamics can determine the physical responses of a multiflagellated microswimmer. With these theoretical attempts, we try to understand how complex living systems can function in fluids by utilizing simple physical rules.

Fanlong Meng is a professor at Institute of Theoretical Physics, Chinese Academy of Sciences. He received his bachelor's degree from University of Science and Technology of China in 2010 and his Ph.D. from Institute of Theoretical Physics, Chinese Academy of Sciences in 2015. From 2015 to 2019, he conducted postdoctoral research at the University of Cambridge, the University of Oxford, and the Max Planck Institute for Dynamics and Self-Organization. In December 2019, Fanlong Meng joined the Institute of Theoretical Physics, Chinese Academy of Sciences as an associate professor and then promoted to be a full professor. His current research focuses on theoretical studies in statistical physics and soft matter physics, including the nonequilibrium dynamics of active matter, rheological properties of polymer systems, etc. (http://lib.itp.ac.cn/html/meng).

Time: Feb. 26, 2026 4:00 PM (Beijing) / 11:00 AM (Moscow)
Zoom: 898 3467 5707 Passcode: 118954

Zoom meeting ID: 890 7187 2369
Пароль: 544845

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End of Seminars Digest, Vol 82, Issue 7
***************************************

Monday, February 23, 2026

NASA's Artemis 2 moon rocket is broken, won't launch until April

NASA's Artemis 2 moon rocket has a problem | Best cheap drones under $500 | 1 week until a breathtaking Blood Moon rises

Created for znamenski.spacecom@blogger.com | Web Version

February 23, 2026

Taking you out of this world, every day

The Launchpad

NASA's Artemis 2 moon rocket has a problem

A full moon rises as the Space Launch System (SLS) rocket and the Orion spacecraft, integrated for the Artemis II mission, are seen at Launch Pad 39B at the Kennedy Space Center in Cape Canaveral, Florida, on February 1, 2026 ahead of the first crewed mission to the Moon in more than 50 years. (Photo by Miguel J. Rodriguez Carrillo / AFP via Getty Images)

(Miguel J. Rodriguez Carrillo/Getty Images)

Hey, Space Fans! Happy Monday and welcome to your daily dose of space from ... well, space. Our top story today is about NASA's Artemis 2 moon mission, which aced a fueling test last week. But now, it's not launching soon at all. Find out why in our report by Mike Wall.

There is some good news from space today, though. We're officially 1 week away from an epic Blood Moon lunar eclipse and SpaceX hit a new record for Falcon 9 reuse. See it all below!

Space deal of the day

Best cheap drones under $500

(James Abbott)

Before we get deep into the news, here's a deal worth checking out in order to begin your own aerial adventures with the best cheap drones as hand-picked by our drone pilot. It may not be Top Gun, but could help you launch your own awesome flights.

Skywatching

1 week until a breathtaking Blood Moon rises

We may not have an Artemis 2 launch to the moon in March, but there is a total lunar eclipse! Here's what you need to know to prepare...it's just one week away.

Total lunar eclipse March 2026: Live updates

See the moon with the 'Seven Sisters' tonight

(Alan Dyer/VW Pics /Universal Images Group via Getty Images)

The moon isn't the only thing shining bright this week. If you look up tonight, you'll be able to see the Pleiades (and not just on the Subaru logo). Here's where to look!

Spaceflight

We ate space mushrooms and survived

(CC BY-SA, The Conversation)

When astronauts go to the moon or Mars, they'll need something to eat. Here's one idea, to make food from mushrooms - but what does it taste like?

Science & Astronomy

A risky visit to interstellar Comet 3I/ATLAS?

(International Gemini Observatory/NOIRLab/NSF/AURA/Shadow the Scientist)

Scientists have been drooling over recent interstellar comets passing through our solar system, but catching up with such a fast cosmic object is a challenge. Now, one team of scientists think they have a way to do it, and it means getting close to the sun.

SpaceX

A SpaceX rocket just aced its 33rd flight

(SpaceX)

From record-breaking speed to a comet to a different kind of record by SpaceX, we now turn to the trusty Falcon 9 rocket. SpaceX launched a doubleheader over the weekend that included a record-setting flight for its most flown Falcon 9. Here's what happened.

Technology

Perseverance rover has its own Mars 'GPS'

(NASA/JPL-Caltech)

NASA's Perseverance rover has found itself, but not in the way you might think. In two minutes, it can do something that could once take a day or more.

Entertainment

12 different ways to watch 'Project Hail Mary'

(Amazon MGM Studios)

We've talked a lot about real space missions today, but there's an epic sci-fi one coming out soon in "Project Hail Mary" and it turns out you'll have more than one way to watch it.

Today in Space

Space photo of the day: Satellite sees northern lights

(NASA Earth Observatory)

The northern lights are always amazing, and it's not just human eyes that are watching them. In this image, a satellite reveals what auroras are like from space. Here's how the image was made.

Learn about the Photo

On this day: Pioneer 11 leaves us all behind

(NASA)

On Feb. 23, 1990, NASA's Pioneer 11 spacecraft left the solar system! It was the second to leave us behind after Pioneer 10, but not the first in interstellar space. Anyone know that one? (Cough cough, Voyager 1.)

And with that, we'll call it a wrap for today's space newsletter. Thanks for reading if you made it this far and keep looking up!

Best,
Tariq Malik
Editor-in-Chief, Space.com

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