Work Experience

Author

Simone Romiti

Expertise Summary

Computational Methods:

  • Monte Carlo algorithms and code development
  • Multi-dimensional integrals (Euclidean path integral)
  • Hamiltonian formulations (Kogut-Susskind)
  • Tensor networks and quantum computing
  • Machine Learning (PINNs, normalizing flows)
  • Bayesian algorithms, Nested Sampling

Physics Areas:

  • Precision lattice phenomenology
  • Hadronic contributions to muon anomalous magnetic moment
  • Transition Form Factors of pseudoscalar mesons
  • Isospin breaking effects on the lattice
  • Lattice Hamiltonians and solution of Schrödinger equation on truncated Hilbert spaces

Technical Skills:

  • High-performance computing (HPC): CPU and GPU parallel computing, Data Structures and Algorithms
  • Open-source software development: git version control, CI/Cd, DevOps
  • Collaboration leadership and project management
  • Cross-disciplinary research integration

Work positions

April 2024 – present · University of Bern, Switzerland

Department:
Institute for Theoretical Physics, Albert Einstein Center for Fundamental Physics (AEC)

Key Activities:

  • Machine Learning applications:

    • Independently developed Physics-Informed Neural Networks (PINNs) method for solving eigenvalue problems in \(\mathrm{SU}(N)\) lattice Hamiltonians | overcoming Hilbert space truncation exponential scaling

  • Hadronic contributions to muon \((g-2)_\mu\):

    • Leading contributor to Hadronic Vacuum Polarization (HVP) calculations for \(u,d,s,c\) flavors and Leading Isospin Breaking corrections. Reference person for Bern group in ETM collaboration’s blinded HVP analysis.
    • Implementation and calculation of meson pole contributions to Hadronic Light-by-Light (HLbL) scattering. Represented collaboration at 2025 \((g-2)_\mu\) Initiative workshop Included in author list of 2025 \((g-2)_\mu\) Whitepaper

  • Transition Form Factors (TFFs):

    • Principal Investigator for CSCS computing time allocation of 240k GPU node hours, for the calculation of \(P\to\gamma^*\gamma^*\) transition form factors for \(\eta,\eta'\) mesons: continuum limit over the ETM ensembles.

  • Numerical developments:

    • Developed open-source implementation of pseudoscalar meson pole contributions (infinite and finite volume)
    • Advanced work on precision lattice QCD at sub-permille level
    • Nested sampling algorithm for lattice field theories

  • Supervision of PhD students

  • Invited speaker at 2025 Scale Setting Workshop (ECT*)

  • Main organizer of Hamiltonian lattice gauge theories workshop (ECT*)

  • Organization support for SIGN25 workshop at ITP Bern

Nov 2021 – Mar. 2024 · University of Bonn, Germany

Department:
Helmholtz Institute for Radiation and Nuclear Physics (HISKP)

Key Activities:

  • Ensemble production and analysis:

    • Contributed to generation and analysis of Extended Twisted Mass Collaboration (ETMC) gauge configurations
    • Code development for tmLQCD library

  • Hamiltonian formulations:

    • Quantum computing simulations of \(\mathrm{U}(1)\) gauge theories in 2+1 dimensions
    • Main developer and maintainer of specialized Monte Carlo library for Hamiltonian lattice gauge theories
    • Developed novel algorithms for \(\mathrm{SU}(2)\) gauge theories maximizing canonical commutation relations
    • Work on Hilbert space truncations via group manifold partitioning

  • Supervision of MS and PhD students

  • Teaching:

  • **Organization support for the Lattice 2022 international conference

Nov 2018 – Oct 2021 · Roma Tre University, Rome, Italy

Department:
Department of Mathematics and Physics

Research Focus:

  • Leading Isospin Breaking Effects (LIBEs):
    • Calculated LIBEs on nucleon spectrum and \(\Delta(1232)\) resonances using RM123 method
    • Provided one of few lattice calculations of neutron-proton mass difference
    • Determined \(\Delta(1232)\) mass splittings
  • Methodological development:
    • Spectral decomposition of Euclidean lattice correlators
    • Advanced understanding of isospin symmetry breaking in QCD
  • Teaching:
    • Tutorial sessions for undergraduate courses

Outcomes:: Successfully defended Ph.D. thesis | Submission: 31st Oct. 2021 | Dissertation: 22 Apr. 2022

Awards and grants

  • 2025-2026: Principal Investigator (PI) of computing time allocation: \(0.24 \cdot 10^{6}\) GPU node hours on ALPS - CSCS Swiss supercomputing cluster | Lattice calculation of the \(\eta,\eta'\) Transition form factors.

  • 2013-2016: Merit Scholarship for excellent students - Physics Department, Roma Tre University. Awarded for top high school marks and academic excellence.