Boostless Cosmological Collider Bootstrap

Understand

Cosmological correlation functions contain valuable information about the primordial Universe, with possible signatures of new massive particles at very high energies.

• Recent developments, including the cosmological bootstrap, bring new perspectives and powerful tools to study these observables.
• In this paper, we systematically classify inflationary three-point correlators of scalar perturbations using the bootstrap method.
• For the first time, we derive a complete set of single-exchange cosmological collider bispectra with new shapes and potentially detectable signals.