13 citations · 18 across the 5 of their papers we have counts for
5 papers · 1 filter
All-Loop Renormalization and the Phase of the de Sitter Wavefunction
Alexander Farren, Ciaran McCulloch, Enrico Pajer +1
Cosmological observables of the primordial universe are encoded in the late-time field-theoretic wavefunction. For shift-symmetric scalars in de Sitter, a good approximation for ma…
On the Asymptotic Nature of Cosmological Effective Theories
Carlos Duaso Pueyo, Harry Goodhew, Ciaran McCulloch +1
Much of our intuition about Effective Field Theories (EFTs) stems from their formulation in flat spacetime, yet EFTs have become indispensable tools in cosmology, where time-depend…
Perturbative unitarity bounds from momentum-space entanglement
Carlos Duaso Pueyo, Harry Goodhew, Ciaran McCulloch +1
Physical theories have a limited regime of validity and hence must be accompanied by a breakdown diagnostic to establish when they cease to be valid as parameters are varied. For p…
A Cosmological Tachyon Collider: Enhancing the Long-Short Scale Coupling
Ciaran McCulloch, Enrico Pajer, Xi Tong
The squeezed limit of the primordial curvature bispectrum is an extremely sensitive probe of new physics and encodes information about additional fields active during inflation suc…
Leading Loops in Cosmological Correlators
Mang Hei Gordon Lee, Ciaran McCulloch, Enrico Pajer
Cosmological correlators from inflation are often generated at tree level and hence loop contributions are bounded to be small corrections by perturbativity. Here we discuss a scen…