TPPC weekly seminar (in-person): Xi Tong - Towards large signals at the cosmological collider
→
Europe/London
Description
Title: Towards large signals at the cosmological collider
Abstract: The squeezed limit of inflationary non-Gaussian correlators is a sensitive probe of new physics and encodes information about additional fields that were active during inflation such as their masses and spins. Operating at an energy scale up to 10^13 GeV, this “Cosmological Collider” stands as an ultimate probe of particle physics in the energy frontier. However, its signal strength is significantly suppressed by Boltzmann factors and cosmic dilution, making detection challenging. To address this problem, I will discuss three distinct mechanisms that each enhance different aspects of the cosmological collider signal strength. These include the introduction of a chemical potential for spinning fields, a tachyonic instability of a scalar field, and a parametric resonance from mass oscillations. I will also briefly discuss their prospects for future observations.
