The Tenth Meeting on CPT and Lorentz Symmetry will be hosted by the IUCSS in the Physics Department, Indiana University in Bloomington, Indiana, U.S.A., from Thursday May 15 to Monday May 19, 2025. The meeting will focus on tests of these fundamental symmetries and on related theoretical issues, including scenarios for possible violations.

Topics include:

• experimental and observational searches for CPT and Lorentz violation involving
• accelerators, colliders, and storage rings
• astrophysical anisotropy, birefringence, and dispersion
• atomic and molecular spectroscopy
• cavities, oscillators, resonators
• charged-lepton flavor-changing processes
• Cherenkov radiation
• clock-comparison measurements
• CMB polarimetry
• condensed-matter applications, Weyl and Dirac semimetals
• cosmic rays
• decays of atoms, nuclei, and particles
• equivalence-principle tests with matter and antimatter
• exotic atoms, muonium, positronium
• gauge bosons and Higgs particles
• gravimetry
• gravitational waves
• high-energy astrophysical observations
• hydrogen and antihydrogen spectroscopy
• lasers, masers
• magnetic and electric dipole moments
• matter-wave interferometry
• meson and baryon properties
• neutral-meson interferometry and decays
• neutrino mixing and propagation, neutrino-antineutrino oscillations
• non-Riemann geometry, torsion, nonmetricity
• nuclear interactions
• particle-antiparticle comparisons
• photon and particle scattering
• post-newtonian gravity in the solar system and beyond
• quantum effects in gravitational fields
• second- and third-generation particles
• short-range gravity
• sidereal and annual time variations, compass asymmetries
• single-top and top pair production
• space-based missions
• spin-gravity couplings
• spin precession
• strong and electroweak interactions
• time-of-flight measurements
• trapped particles, ions, and atoms
• ultracold neutrons


• theoretical and phenomenological studies of CPT and Lorentz violation involving
• physical effects involving the Standard Model, General Relativity, and beyond
• origins and mechanisms for violations
• classical and quantum field theory, gravitation, particle physics, and strings
• mathematical foundations, Finsler geometry

There is no registration fee for this conference, but online registration by Thursday April 17 is required. The total attendance is likely to be capped, so early registration is advised to avoid disappointment.