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#quantumfieldtheory

1 post1 participant0 posts today
Paul Balduf

New theoretical #physics preprint arxiv.org/abs/2412.08617
We looked at the asymptotic growth rate of the beta function in #quantumFieldTheory , and the relative importance of subdivergence-free #Feynmangraph s. These graphs correspond to integrals, and the size of the graph is measured by its loop number, which also indicates how hard it is to solve the integral. State of the art computations in realistic theories are anywhere between 1 and 6 loops. The asymptotics of the perturbation series is known from instanton calculations. We now showed (in a model theory), that the leading asymptotics describes the true growth rate only for more than 25 loops, way beyond anything that can realistically be computed.

This is good news: It tells us that asymptotic instanton calculations provide non-trivial additional information that can not be trivially inferred from low-order perturbation theory.
In the plot, the red dots are numerical data points for the subdivergence-free graphs in phi^4 theory up to 18 loops, the green lines are the leading instanton asymptotics.

MPI for Gravitational Physics

📣 Tiburtius Prize 2024 for Gustav Uhre Jakobsen 🏆

Recognition award for visiting postdoc at AEI Potsdam

Gustav Uhre Jakobsen, a postdoc at the Humboldt University of Berlin and in the Astrophysical and Cosmological Relativity Department at the @mpi_grav in the Potsdam Science Park, will be awarded a “Tirburtius Prize – Prize of the Berlin Universities” for his dissertation.

The reviewer praises not only the impressive wealth of topics in Jakobsen's doctoral thesis titled “Gravitational Scattering of Compact Bodies from Worldline Quantum Field Theory” and the quality of the research results, but also the impact it has had in the research community.

➡️ aei.mpg.de/1202051/tiburtius-p

www.aei.mpg.deTiburtius Prize 2024 for Gustav Uhre JakobsenGustav Uhre Jakobsen will be awarded the Tiburtius Prize 2024 for his outstanding dissertation on gravitational scattering of compact bodies from worldline quantum field theory. Learn more about the award and his research at the Max Planck Institute for Gravitational Physics and the Humboldt University of Berlin.
#ResearchAward#Berlin#PhDThesis
Paul Balduf

Two years ago, I began writing my #doctoralThesis in theoretical #physics. Most effort went into giving a very detailed pedagogical account of what the #renormalization #HopfAlgebra in #QuantumFieldTheory does, and why it is natural and transparent from a physical perspective.
One year ago, my referees recommended in their reports to publish the thesis as a book, and today I received the printed copies!
It was exciting to go through all the steps of actually publishing a book, and I hope that it will be of use to convince physicists that the Hopf algebra structure in #QFT is not a weird mathematical conundrum, but it actually encodes the very way physicists have been thinking of renormalization since the 1950s: Parametrize a theory by quantities one can actually measure, instead of fictional expansion parameters.
link.springer.com/book/10.1007

Paul Balduf

In #QuantumFieldTheory, scattering amplitudes can be computed as sums of (very many) #FeynmanIntegral s. They contribute differently much, with most integrals contributing near the average (scaled to 1.0 in the plots), but a "long tail" of integrals that are larger by a significant factor.
We looked at patterns in these distributions, and one particularly striking one is that if instead of the Feynman integral P itself, you consider 1 divided by root of P, the distribution is almost Gaussian! To my knowledge, this is the first time anything like this has been observed. We only looked at one quantum field theory, the "phi^4 theory in 4 dimensions". It would be interesting to see if this is coincidence for this particular theory and class of Feynman integrals, or if it persists universally.
More background and relevant papers at paulbalduf.com/research/statis
#quantum #physics #statistics

Ocēlōtl cehuetzilizpan ❄️

Why does anything exist? Well…

What if black holes are observers in the quantum sense? What if the #universe itself is an observer in the quantum sense? That is the question.

So anyway #QuantumFieldTheory in curved spacetime is pretty dope. I love how mind-bending #QuantumPhysics is and how this video plays into my interest in #cosmology and #philosophy.

I’ll just pass this along. Anton Petrov did a great video on the topic.

youtu.be/3_hi48l-cj8?si=nsTHJF

YouTubeStrange New Explanation for Why Quantum World Collapses Into RealityBy Anton Petrov
Erwin Schrödinger Institute

The newest publications following the thematic programme on #QuantumFieldTheory at the Frontiers of the #StrongInteraction tell us that August was a productive month at
@ESIVienna. 🤩

Check out one of the articles released just now:
Bahman Dehnadi, André H. Hoang, Oliver L. Jin, Vicent Mateu / Top Quark Mass Calibration for #MonteCarloEventGenerators - An Update

arxiv.org/pdf/2309.00547.pdf

#highenergyphysics #MC
@univienna #quantumfieldtheory

*
Erwin Schrödinger Institute

We are happy to announce that a new thematic programme with 5 focus weeks just got started at
@ESIVienna
! 🥳 Check out the details below ⏬

📅 31st July - 1st September 2023 📅
📌 Schrödinger Lecture Hall 📌

▫️ Programme description ▫️
esi.ac.at/events/e476/

📚 Subject: #QuantumFieldTheory at the Frontiers of the #StrongInteraction
📓Week 1: Finite-Mass and #Electroweak Effects in #gaugetheories
📕 Week 2: #Singularity Structure of Quantum Field Theory Beyond the Leading Power
📗 Week 3: #Factorization Violation and the #Space of Universal Functions
📘 Week 4: Simulation of the All Order Structure of Scattering Amplitudes
📙 Week 5: Multi-Variable Techniques for All Order Resummations in QFT

(see the motion picture at twitter.com/ESIVienna/status/1)

@univienna

www.esi.ac.atActivitiesThe Erwin Schroedinger International Institute For Mathematics and Physics
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