The Fourth IUCSS Summer School and Workshop on the Standard-Model Extension (SME) will be held as an online event hosted by the Physics Department, Indiana University in Bloomington, from Friday May 21 to Sunday May 30, 2021. This School is aimed primarily at students and researchers in theory and experiment who seek a pedagogical introduction to the SME framework.

The School will begin by laying out basics of the effective field theory for Lorentz and CPT violation. Building on this groundwork, more advanced theoretical, phenomenological, and experimental topics of recent interest in the subject will be covered with the goal of leading the participants to the cutting edge of research in this field. Discussion sessions will support and complement the lecture material. The School participants will be given the opportunity to exhibit their own work via short presentations. An IUCSS Workshop on current research in SME physics will be held concurrently during the last part of the School.

Topics scheduled for coverage include:

• Effective field theory description of Lorentz and CPT violation
  • mechanisms for spacetime-symmetry breakdown
  • minimal SME in Minkowski spacetime
  • spacetime transformations and their interplay
  • minimal gravitational couplings and dynamics
  • nonminimal SME, operators of higher mass dimensions
  • spontaneous violations of spacetime symmetries; NG and massive modes
  • explicit breaking and no-go constraints
  • Finsler geometry and SME physics
• Physical effects and phenomenological tools
  • 3+1 and spherical decompositions, sidereal variations
  • predictions for atomic and nuclear energy-level shifts
  • effects on trapped particles
  • Lorentz and CPT violation in neutrino oscillations and propagation
  • signals in neutral-meson oscillations
  • SME corrections to QCD and hadronic physics
  • Lorentz- and diffeomorphism-breaking effects in linearized gravity
  • signatures in gravitational waves
  • SME applications to Weyl semimetals
• Experimental searches for Lorentz and CPT violation
  • clock comparisons and spectroscopy of hydrogenlike systems
  • bounds from neutrino kinematics and oscillations
  • constraints from collider physics
  • tests involving strong-interaction physics
  • investigations of higher-generation, gauge, and Higgs particles
  • matter-antimatter comparisons
  • astrophysical observations of photons, cosmic rays, gravitational waves
  • tests in short-range gravity
  • searches for spacetime torsion and nonmetricity with SME methods

There is no registration fee for the School or Workshop, but online registration on or before Friday May 14, 2021 is required. The total attendance is likely to be capped, so early registration is advised to avoid disappointment.