However, there is also evidence of fundamental physics at the subelectronvolt scale. Some of these particles, such as neutralinos, are natural candidates for the constituents of cold dark matter (CDM) in the form of so-called weakly interacting massive particles (WIMPs). Indeed, most proposals to embed the Standard Model of particle physics into a more general, unified framework-notably those based on string theory or its low-energy incarnations, supergravity and supersymmetry-predict new heavy ( m≳100 GeV) particles that may be searched for at teraelectronvolt colliders. There is much circumstantial evidence that the teraelectronvolt-scale physics exploited at the LHC will provide decisive insights into fundamental questions such as the origin of particle masses, the nature of dark matter in the universe, and the unification of all forces, including gravity. We are entering an exciting time in particle physics: The Large Hadron Collider (LHC) is setting a new benchmark at the high-energy frontier and, through the collision of multiteraelectronvolt protons, is probing the structure of matter and space-time at an unprecedented level.
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