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maximfitkevich.bsky.social
Max
@maximfitkevich.bsky.social
12 followers 21 following 64 posts
Physicist (INR RAS & MIPT), quantum aspect of black holes, QFT toy models.
Also have YT channel Δρуг Вигнερα (@WignersFriend).
Nostalgic gamer and amateur artist.
Kinda libertarian.
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maximfitkevich.bsky.social
Perfection of dark and light.
November 1, 2025 at 9:56 PM
maximfitkevich.bsky.social
Trees of wood and concrete.
October 31, 2025 at 9:59 PM
maximfitkevich.bsky.social
Reflections and transmissions.
October 15, 2025 at 8:40 PM
maximfitkevich.bsky.social
Other days.
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)
October 15, 2025 at 8:36 PM
maximfitkevich.bsky.social
Announcement 'Fields and Strings 2025' (December 1-6).
October 15, 2025 at 6:09 PM
maximfitkevich.bsky.social
On QFT section.
Michael Bordag (Universität Leipzig) Dmitry Levkov (INR RAS & ITMP MSU)
October 15, 2025 at 5:37 PM
maximfitkevich.bsky.social
First day. Plenary session.
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.
October 15, 2025 at 5:06 PM
maximfitkevich.bsky.social
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.
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.
October 15, 2025 at 4:08 PM
maximfitkevich.bsky.social
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
Leonhard Euler International Mathematical Institute
October 15, 2025 at 4:01 PM
maximfitkevich.bsky.social
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!
August 28, 2025 at 9:50 AM
maximfitkevich.bsky.social
This deserves to appear in history books but not within some light-shining chapters.
Trump and Putin. Anchorage, 2025
August 17, 2025 at 6:45 PM
maximfitkevich.bsky.social
It's done, it's finally done.

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

Some figures:
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.
July 27, 2025 at 6:18 PM
maximfitkevich.bsky.social
Our notable institute photographer returned with her new collection 'Elbrus region's birds' so I continue mocking.
May 23, 2025 at 7:42 PM
maximfitkevich.bsky.social
It will never get old)

By the way, time comes.
April 14, 2025 at 9:38 PM
maximfitkevich.bsky.social
General aplicability of 'island' calculation for the Hawking radiation entropy (Page curve) seemimgly contradicts to fact that non-singular black hole can have arbitrary amount of entanglement as remnant in the end of evaporation if one accepts semiclassical spacetime picture more or less seriously.
April 7, 2025 at 8:25 PM
maximfitkevich.bsky.social
Maybe I didn't realise it yet, but I feel it like I lost my best chance at creating happiest possible future. Maybe I just became overdramatic.
No matter. Events turn out so I can literally die very soon by external cause.
I take this moment to calm down and process where I stay and what I gonna do.
Night Quarter Moon from the window with plants as I texting this post.
March 7, 2025 at 10:46 PM
maximfitkevich.bsky.social
5th day.
Plenary: physics at LHC.
Parallels: Gravitation and cosmology (quantum fields and gravity), Detectors (methods of development), Neutrino (oscillations), BSM physics (experimental limits), Fundamental interactions (topics in QFT).
Top-quarks physics (Lev Dudko's talk). Growth of axion stars (Dmitry Levkov's talk). Factorization of the Hilbert space of eternal black holes in general relativity (Mikhail Khramtsov's talk). Computing the trace of two-sided observables as a sum over a recently constructed family of semiclassically well-controlled black hole microstates containing heavy matter shells behind the horizon and forming an overcomplete basis. Trace of operators dual to functions of the Hamiltonians of the left and right holographic CFTs factorizes into a product over left and right factors to leading order in the semiclassical limit. Searches for nontrivial structures in Universe (Olga Sazhina's talk). Improved observational signatures for cosmic strings.
February 22, 2025 at 3:37 PM
maximfitkevich.bsky.social
4th day.
Plenary: astrophysics.
Parallels: Gravitation and cosmology (Horndeski), Fundamental interactions (topics in QFT), Astroparticle physics (cosmic rays), Detectors (methods of development).
Memorial: in honor of V.A. Rubakov.
Cosmic rays in our Galaxy (Andrei Bykov's talk). Cosmic rays with energy > 10^19 eV (Mikhail Yu. Kuznetsov's talk). From section devoted to modified gravity (Hordeski theory and beyond). Remembering the life of Valery Rubakov.
February 22, 2025 at 3:18 PM
maximfitkevich.bsky.social
3rd day.
Plenary: collider physics.
Parallels: Fundamental interactions, Astroparticle physics (neutrino), BSM physics (dark matter, higgs), Neutrino physics (nuGen, NOvA, T2K, JUNO), Gravitation and cosmology (dark matter, inflations and alternatives).
The Project of Super Tau-Charm Factory in China (Xiaorong Zhou's talk). The proposed STCF is a symmetric electron-positron beam collider designed to provide e+e− interactions at a center-of-mass energy from 2.0 to 7.0 GeV. The peaking luminosity is expected to be 0.5×10^35 cm−2s−1. STCF is expected to deliver more than 1 ab−1 of integrated luminosity per year. The huge samples could be used to make precision measurements of the properties of XYZ particles; search for new sources of CP violation in the strange-hyperon and tau−lepton sectors; make precise independent measurements of the Cabibbo angle (theta)c) to test the unitarity of the CKM matrix; search for anomalous decays with sensitivities extending down to the level of SM-model expectations and so on. In this talk, the physics interests will be introduced as well as the the recent progress on the project R&D.
February 21, 2025 at 11:12 AM
maximfitkevich.bsky.social
2nd day.
Plenary: neutrino physics.
Parallels: Gravity and cosmology (quantum aspects), Nuclear physics (models), Fundamental interactions (topics in QFT), BSM physics (FIMPs, ALPs, higher spins), Detectors (methods of development).
Results and prospects of Spektr-RG (Rashid Sunyaev's talk). Ditto. Quantum chaos in field theories and black holes (Dmitry Ageev's talk). On notions of quantum chaos in black holes and quantum field theory in form of spectral form factor and eigenvalues repulsion for out-of-equilibrium states (low-dimensional black holes/de Sitter normal modes) and implications for holography. Sterile neutrino and dark matter (Dmitry Kalashnikov's talk). Resonance mechanism of sterile neutrino creation in early universe with lepton asymmetry and limitations on parameter space from dark matter.
February 21, 2025 at 10:15 AM
maximfitkevich.bsky.social
1st day.
Plenary: high-density particle physics (baryonic matter, NICA).
Parallels: Astroparticle physics (TAIGA, Carpet-2,3), Gravity and cosmology (black holes physics), Collider techs and physics (status reports), Fundamental interactions (topics in QFT), Nuclear physics (heavy ions collisions).
Extremal light fields (Alexander Sergeev's talk). How to achieve as large as possible (probably near-Schwinger) electric fields using powerful laser beams. Devices of NICA (Andrey Butenko's talk). Experiments at NICA (Victor Riabov's talk). Picking correct gravity theory by observation of black hole silhouettes (Vyacheslav Dokuchaev's talk).
February 21, 2025 at 8:41 AM
maximfitkevich.bsky.social
The Rubakov 70th Anniversary conference has started.

Introductory speech is held by academician Viktor Matveev, ex-director of JINR (Dubna).
February 17, 2025 at 9:18 AM
maximfitkevich.bsky.social
Alexey Navalny was Eddard Stark. He caused rustle, his death was meaningless and send aftershocks still shaking us. He was indispensable and it turned no one deserved his mantle now. He didn't merely died, he aren't even killed. He was cowardly put to death by kgbist nomenclature. God damn them all.
February 16, 2025 at 11:25 AM
maximfitkevich.bsky.social
I do not understand hating Elon so much.
Maybe it's because USA have all money of the world so still you have not realized how destructive inefficient bureacracy is. USSR was run by such class and yet socialism somehow beloved by people.
Hell with his salute, DOGE has vibes of institute from sci-fi.
February 15, 2025 at 9:13 AM
maximfitkevich.bsky.social
Exemplar architecture of the Soviet modernism.
Inside 'The Golden Brain' (the Praesidium of RAS), Winter Garden.
In preparations held before the upcoming conference honoring V.A Rubakov.
February 14, 2025 at 8:58 PM