Hands-On CL Workshop 2026

The Hands-On \(\mathcal{C}\mathtt{osmo}\mathcal{L}\mathtt{attice}\) Workshop: Simulating the Early Universe was held at the Department of Theoretical Physics of the Complutense University of Madrid, Spain, during May 7-8 2026. This workshop was conceived as an intensive and practical introduction to lattice-based numerical techniques for studying non-linear field dynamics in cosmology. The program combined focused lectures with guided hands-on sessions, enabling participants to gain both conceptual understanding and direct experience with state-of-the-art simulation tools. A central component of the workshop was the use of \(\mathcal{C}\mathtt{osmo}\mathcal{L}\mathtt{attice}\), an open-access high-performance framework for lattice simulations of field theories in an expanding Universe. Participants learned how the code is structured, how to configure and run simulations efficiently, and how to interpret their physical output in cosmological contexts.

The Indico page of the event was:

https://indico.fis.ucm.es/event/41/

Lecturers:

  1. N. Loayza ........... CEICO-FZU, Prague, Czechia
  2. K. Marschall ........... IFIC, Valencia, Spain
  3. J. Rubio ........... Universidad Complutense de Madrid, Spain
  4. F. Torrenti ........... Universidad Carlos III de Madrid, Spain

Scientific Program

  • Introduction to non-linear phenomena in the early Universe.
  • Lattice field theory techniques.
  • Structure and architecture of CosmoLattice.
  • Simulation of interacting fields in expanding backgrounds:
    • Scalar field dynamics with general potentials.
    • Abelian gauge fields coupled to charged scalars.
    • Gravitational wave generation from non-linear field dynamics.

The workshop was aimed at graduate students, PhD students, and postdoctoral researchers interested in computational approaches to early-Universe physics. The objective was to equip participants with the tools needed to confidently implement and analyze lattice simulations of complex cosmological models.

Organizers

  1. T. Mendes ........... Universidad Complutense de Madrid, Spain
  2. J. Rubio ........... Universidad Complutense de Madrid, Spain
  3. F. Torrenti ........... Universidad Carlos III de Madrid, Spain