Max

How “intelligent” is a slime mold? When it solves mazes, it might not be thinking:it’s obeying physics. Our new paper with
@jordiplam.bsky.social shows how it follows a least action principle,letting physics do the job arxiv.org/pdf/2511.08531
@drmichaellevin.bsky.social @docteur-drey.bsky.social

Perfection of dark and light.

Trees of wood and concrete.

Reflections and transmissions.

Main hall.

Charged topological geons with a selfgravitating scalar field. Alexander Tsirulev (Tver State University)

Form of axion in DFSZ models with U(1)pq symmetry. Binh Vu (Bogoliubov Laboratory of Theoretical Physics, JINR)

R-rule and effective potential in subleading logarithmic approximation in arbitrary non-renormalizable scalar field model. Ravil Iakhibbaev (JINR BLTP)

Other days.

Announcement 'Fields and Strings 2025' (December 1-6).

Michael Bordag (Universität Leipzig)

Dmitry Levkov (INR RAS & ITMP MSU)

On QFT section.

Statistical Field Theory Across Classical Nonequilibrium Noise-Driven Systems. Michal Hnatic (JINR,BLTP) Over the past five decades, methods of quantum field theory (QFT) have been fruitfully applied to a broad class of problems in classical physics — including phase transitions, chemical reaction kinetics, percolation, interfacial growth, fully developed turbulence, magnetohydrodynamics, and related phenomena — substantially advancing our understanding of complex stochastic systems and catalyzing the emergence of statistical field theory. For several representative models with distinct physical content, the principal stages of adapting QFT techniques to stochastic problems, highlighting issues associated with the structure of propagators and the selection of noise correlators, are delineated. The main results for fixed points, control parameters, and critical exponents are presented up to three-loop order.

Multipurpose Renormalization Group as a consequence of locality of QFT. Dmitry Kazakov (JINR) R-operation and locality of QFT guarantees locality of the counterterms in coordinate space or at most polinomiality in momentum space. This leads to relations between the counterterms in subsequent orders of perturbation theory. In its turn these relations allow one to get the recurrent relations which can be promoted to RG equations for the leading, subleading, etc logarithms. Remarkably that the RG equations in sub, subsub, etc orders are always linear differential ones. The advocated formalism works equally well in renormalizable and non-renormalizable theories. Different examples are presented.

First day. Plenary session.

The combination of his brilliant teaching skills and outstanding scientific talent ultimately led to the emergence of the so-called "Vasiliev School." Among Alexander Nikolaevich's students there are 9 doctors of science and over 20 candidates of science. Many of his former students have developed their own scientific areas and have their own students. The results obtained by professor Vasiliev and representatives of his school highlight the profound internal unity of classical and quantum complex systems with a large number of degrees of freedom. Many of the problems that captivated Vasiliev's attention remain relevant to this day and continue to be explored by his students.

The greatest international recognition he gained as an outstanding specialist in the field of functional methods in quantum field theory and statistical physics. Professor Vasiliev had a particular interest in the theory of scale-free long-range correlations, such as found in critical behavior or turbulent motion.

Theoretical physicist, professor Alexander Nikolaevich Vasiliev (1940 – 2006). The years of his work coincided with a period of rapid development in theoretical physics. At the beginning of his career, professor Vasiliev achieved notable success in the field of Constructive Quantum Field Theory.

Leonhard Euler International Mathematical Institute

At conference 'Models in QFT-2025' dedicated to A.N. Vasiliev (October 6-10), Saint Petersburg.

- Math. methods in QFT
- QFT methods in elementary particle physics
- Field theory methods in statistical physics
- Gravitation and cosmology
- Integrable models, symmetries in QFT, and quantum groups

Damn, Twitter is toxic as hell, but Bluesky feels like really dead thing.

YouTube video by Shoe0nHead These People Are Sick

Fortunately, I had no friends celebrating Kirk's murder but I had friends celebrating war with Ukraine and generally praising death so I kinda relate with what adequate American citizens (like Shoe0nHead) feel.

YouTube video by Sabine Hossenfelder I can't believe this really happened.

A very disturbing message by Sabine Hoffenfelder.

Is 'Science' a science or lead us astray? Could not it become human, all too human?

Z or left?

This is why I so disgusted of current political processes in Europe and US.

It is like we become Eastasia and Oceania having not to pick a side between them.

Yes, our 'Z-people' are the true Russian leftists.
All about them looks similar: resentment about history, collective guilt, intolerable behaviour and seek for opponents' death. Forget about technicalities like ecomomic beliefs and look at the core of their nature manifesting oppression and control.

You may wonder why I'm talking about the West while living in Russia but we're prohibited to speak truths about us and you now mirror Putin's state pretty well. We are the same.

Irina Zarutskaya. Charlie Kirk.

I need to say this loudly. Whatever I'm right or not, I'm definitely anti-left now.

There are differences, I guess.
Vladimir Putin: external, uncontrolled by fact, and villaneous.
Decarlos Brown: internal, potentially controllable, and mental.
I'm just continuously making sure USA local authorities are as puny as European or our Russian.
Posers to handle 'global problems'. Pitiful.

One hopes that progress somehow figures it out itself. Hope is the mother of fools. The progress is fragile thing. There is no such law of nature that progress is inevitable. We need to renounce hope and take our chances with simple luck backed by action. I become certain XXI is a no-return century.

We face now the vicious crisis where demographic shift, cultural decline, and AI takeover will meet each other very soon. If the West fall could anyone shorten the darkness or ever survive this turnover? We do not appreciate enough the importance of coming events focusing instead on surface signals.

Fire.

I still try to process this story. I mean, how it could have happened in the center of the West? I thought it's Putin's Russia is a cauldron of savagery.
Who would guess the UK government is so full of shit?!
Who are the 'genetic slaves' now?
Shame!

Trump and Putin. Anchorage, 2025

This deserves to appear in history books but not within some light-shining chapters.

Is quantum nature of reality a necessary property of how information structures itself?

Godel incompleteness and undecidability are ultimately related with indefiniteness of measurements.

Information finiteness implies uncertainty and randomness.

Unbelievable. I'm still in struggle to process it.

Plots of generalized entropy of the Hawking radiation for the CGHS model (dashed) and the sinh-CGHS model (thick).

Page curve for sinh–CGHS black hole during evaporation. Monotonic dashed curve is Hawking answer for radiation S_rad(t) = 2(S_BH(0) − S_BH(t)). Contribution from island falls before it approaches Mqb and then starts to grow again exceeding Hawking answer. Remnants should decay to protect unitary evolution on timescale τ .

Black hole decay spacetime. Vertical strip represents wave packet of matter forming initial black hole with closed apparent horizon (dashed curve). Black hole evaporates linearly producing a bulk of Hawking radiation. On the final stage it cools down forming a remnant which eventually decays into last burst of quantum radiation leaving empty space.

Quantum xerox. Vertical strips are wave packets falling into black hole. After scrambling time the quantum information returns with Hawking radiation quanta (thin line). One can make a slicing Σ so that quantum state |ψ⟩ is represented simultaneously inside the black hole interior and in the Hawking radiation.

It's done, it's finally done.

ArXiv: 2507.17933 [hep-th] Entanglement islands and black hole decay in regular dilaton gravity.

Some figures:

Rather a concluding part of the trilogy

Our notable institute photographer returned with her new collection 'Elbrus region's birds' so I continue mocking.

Landau and Lifshitz.

It will never get old)

By the way, time comes.