75 citations · 79 across the 7 of their papers we have counts for
7 papers
A de Sitter S-matrix from amputated cosmological correlators
Scott Melville, Guilherme L. Pimentel
Extending scattering to states with unphysical mass values (particles ``off their mass shell'') has been instrumental in developing modern amplitude technology for Minkowski spacet…
A de Sitter -matrix for the masses
Scott Melville, Guilherme L. Pimentel
We define an -matrix for massive scalar fields on a fixed de Sitter spacetime, in the expanding patch co-ordinates relevant for early Universe cosmology. It enjoys many of the s…
Positivity and the Electroweak Hierarchy
Joe Davighi, Scott Melville, Ken Mimasu +1
We point out that an unnatural hierarchy between certain higher-dimensional operator coefficients in a low-energy Effective Field Theory (EFT) would automatically imply that the Hi…
The Cosmological Tree Theorem
Santiago Agui-Salcedo, Scott Melville
A number of diagrammatic "cutting rules" have recently been developed for the wavefunction of the Universe which determines cosmological correlation functions. These leverage pertu…
Orbital Precession and Hidden Symmetries in Scalar-Tensor Theories
Anne-Christine Davis, Scott Melville
We revisit the connection between relativistic orbital precession, the Laplace-Runge-Lenz symmetry, and the -channel discontinuity of scattering amplitudes. Applying this to sca…
Distant foreground and the Hubble constant tension
Vladimir Yershov
It is possible to explain the discrepancy (tension) between the local measurement of the cosmological parameter (the Hubble constant) and its value derived from the Planck-mi…