Recent & Upcoming Events | CRC 1639 NuMeriQS

B02 Summer Hackathon 2026

Mon, 17 Aug 2026 10:00:00 +0000

Many thanks to the Institute of Computer Science for giving us access to one of their computer pools!

Computational Astrochemistry

Tue, 16 Dec 2025 15:15:00 +0000

Serena Viti will talk on

Computational Astrochemistry

In Astrochemsitry - the field that studies molecules in space - building accurate chemical models is central to our understanding of how molecules can form and be destroyed in space. The accuracy of such models however is heavily dependent on the availability of complete chemical gas-phase and solid-state reaction networks. Due to the very non linear nature of chemistry in space, as well as the complex interactions between the chemistry and the physics of the gas and dust, determining the right sets of species and possible reactions between them is not trivial. In this talk I shall give an overview of the challenges we face when designing and optimizing networks as well as possible avenues for solutions, including sensitivity analysis, data-driven methods and machine learning.

Promit Ray’s title is

Smarter Molecules, Safer Models: A Virtual Chemistry AI Lab for Governed Scientific Discovery

AI now plays a central role in proposing new molecules, optimizing materials, and accelerating numerical modeling, yet its scientific reliability ultimately depends on the structure and integrity of the underlying data. In this talk, I present a practical end-to-end workflow that integrates Vivian for interactive molecular and materials exploration, ChemLabFlow for standardized chemical and experimental data management, and the VAIL (Virtual AI Lab) as a governed

Infinite Matrix Product States for (1+1)-Dimensional Gauge Theories

Mon, 15 Dec 2025 17:15:00 +0000

(1+1)-dimensional gauge theories provide tractable toy models for studying non-perturbative phenomena of importance in (3+1)-dimensional field theories such as QCD. In the past decade, tensor network methods have enabled new lattice studies of such theories in the Hamiltonian formalism. However, existing approaches have been limited in their ability to maintain manifest translation invariance and locality for non-abelian theories. In this talk, we present link-enhanced matrix product operators (LEMPOs), a novel construction that acts on both the physical and virtual spaces of symmetric matrix product states. LEMPOs allow us to represent the lattice Hamiltonians of (abelian or non-abelian) gauge theories in a local and manifestly translation-invariant form, enabling studies on infinite lattices. We demonstrate this method with recent results for the Schwinger model and adjoint QCD2.

Projected Entangled Pair States for Lattice Gauge Theories with Dynamical Fermions

Tue, 09 Dec 2025 15:15:00 +0000

Gauge theories underpin much of modern physics, from the Standard Model to effective descriptions of strongly interacting systems. While quantum chromodynamics is perturbative at high energies, nonperturbative tools are required in the low-energy regime. Lattice gauge theory provides a gauge-invariant regularization well suited for this purpose. By using Euclidean Monte Carlo simulations, this formulation has enabled major progress. Yet important regimes — such as finite-density fermionic systems and real-time dynamics — remain difficult due to the sign problem and the Euclidean nature of standard algorithms. These challenges have motivated alternative approaches, including Hamiltonian formulations amenable to quantum simulation and variational methods. Among the most powerful classical variational techniques are tensor networks. In this talk, I will give a short introduction into tensor networks and introduce a specific Ansatz, Gauged Gaussian Projected Entangled Pair States (GGPEPS). GGPEPS are gauge-invariant tensor-network, that allow efficient contraction in higher spatial dimension, and avoid the sign problem due to a variational Monte Carlo procedure. I will outline their construction, discuss key analytical features, and demonstrate their numerical performance on a (2+1)d Z2 lattice gauge theory with dynamical fermionic matter.

NuMeriQS Retreat 2025

Mon, 15 Sep 2025 10:00:00 +0000

The second NuMeriQS retreat will take place from September 15 to September 18, 2025, at Kloster Steinfeld.

Hamiltonian Lattice Gauge Theories: Status, Novel Developments and Applications

Mon, 01 Sep 2025 09:00:00 +0000

This NuMeriQS workshop - co-organised with CQTA and ECT* took place at ECT* in September 2025 focused on the status, theoretical developments, and first applications of Hamiltonian Lattice Gauge theories.

We had a very fruitful meeting with participants from Europe, USA, and Japan. With keynote lectures in the mornings by internationally highly visible researchers, and talks by the individual participants thereafter, many relevant topics were discussed in an open and constructive atmosphere. Also early career researchers had the opportunity to either talk or present their work in the poster session.

The details of the programme can be found on its indico page.

Quantum Workshop

Mon, 12 May 2025 09:00:00 +0000

From May 12 to May 14, 2025, NuMeriQS researchers participated in the Quantum Workshop at DESY Zeuthen.

Over three days of stimulating talks and discussions, researchers from different NuMeriQS working groups and DESY Zeuthen exchanged ideas about their ongoing work. This fruitful interaction led to valuable insights and accelerated progress across multiple research projects. It also strengthened and deepened communication between the NuMeriQS working groups and DESY. Moreover, the workshop provided early-career researchers with the opportunity to engage in in-depth discussions and learn from experienced scientists.

Beyond the scientific program, social activities such as shared dinners and a stroll through Treptower Park provided valuable opportunities for discussing and networking among all participants.

Floquet physics and Lattice fermions

Fri, 13 Dec 2024 13:15:00 +0000

t.b.a.

Wed, 11 Dec 2024 14:15:00 +0000

Machine-Learning-Based Sampling in Lattice Field Theory and Quantum Chemistry

Mon, 21 Oct 2024 14:00:00 +0000

This NuMeriQS workshop is co-organised by the TRA Matter. More details and the possiblity to register can be found on the workshop indico page.

NuMeriQS Retreat 2024

Mon, 30 Sep 2024 09:00:00 +0000

Please save the date for the first NuMeriQS Retreat. It will take place in the Bethe Center for Theoretical Physics. The indico web page of the meeting will be used for registration and timetable.

NuMeriQS Kickoff Meeting

Wed, 17 Apr 2024 14:00:00 +0000

In the afternoon of Wednesday, April 17 2024 we will have a kickoff meeting for our newly funded collaborative research centre CRC1639. It will take place in the lecture hall of the Helmholtz-Institut für Strahlen- und Kernphysik.

After a short welcome, we will have two presentations by international experts on topics at the center of the CRC. Thereafter, we will have a reception.

Everyone is welcome, however, registration is mandatory.

The convergence of HMC on non-compact Riemannian Manifolds

Tue, 16 Apr 2024 15:15:00 +0000