The Future of High-Energy Collider Physics

High-energy collider physics in the next decade will be dominated by the LHC, whose high-luminosity incarnation will take Higgs measurements and new particle searches to the next level. Several high-energy $e^+ e^-$ colliders are being proposed, including the ILC (the most mature), CLIC (the highest energy) and the large circular colliders FCC-ee and CEPC (the highest luminosities for $ZH$ production, $Z$ pole and $W^+ W^-$ threshold studies), and the latter have synergies with the 100-TeV $pp$ collider options for the same tunnels (FCC-hh and SppC). The Higgs, the Standard Model effective field theory, dark matter and supersymmetry will be used to illustrate some of these colliders' capabilities. Large circular colliders appear the most versatile, able to explore the 10-TeV scale both directly in $pp$ collisions and indirectly via precision measurements in $e^+ e^-$ collisions.