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An important open question in fundamental physics concerns the nature ofspacetime at distance scales associated with the Planck length. The widespreadbelief that probing such distances necessitates Planck-energy particles hasimpeded phenomenological and experimental research in this context. However, ithas been realized that various theoretical approaches to underlying physics canaccommodate Planck-scale violations of spacetime symmetries. This talk surveysthe motivations for spacetime-symmetry research, the SME test framework, andexperimental efforts in this field.

Spacetime-symmetry violations: motivations, phenomenology, and tests