When: Friday, February 16, 2024, 2:30 PM - 3:30 PMWhere: GO Jones 610
Cosmological Correlators Through the Looking Glass
Cosmological correlators are the fundamental observables of early universe cosmology and the inflationary universe, but turn out to be very complicated to calculate primarily due to the breaking of time translation invariance of cosmological backgrounds. Much progress has been made in recent years in developing new computational techniques with the aim of computing cosmological correlators in more efficient ways in order to, for example, extract the cosmological collider signals. In this talk I will show that the parity-odd sector of primordial perturbations takes a simpler form compared to the parity-even counterpart, and show that the parity-odd inflationary four-point function due to the exchange of massive spinning fields can be computed with ease. From the result we can do particle physics spectroscopy and read off the mass and spin of the exchanged field.