4 papers
The Unitary Architecture of Renormalization
Ameya Chavda, Daniel McLoughlin, Sebastian Mizera +1
We set up a bootstrap problem for renormalization. Working in the massless four-dimensional O model and the theory, we prove that unitarity leads to all-loop recursion…
Hadamard tails from flat-space perturbation theory
Ameya Chavda, Alberto Nicolis, Alessandro Podo +1
The short-distance singular structure of the two-point function of a free scalar field in curved spacetime has a universal behavior that characterizes well-behaved states (called H…
The impact of initial conditions on quasi-normal modes
Ameya Chavda, Macarena Lagos, Lam Hui
This study investigates the influence of initial conditions on the evolution and properties of linear quasi-normal modes (QNMs). Using a toy model in which the quasi-normal mode ca…
Kinematical and dynamical aspects of ghost-matter cosmologies
Ameya Chavda, John D. Barrow, Christos G. Tsagas
We consider the kinematical and dynamical evolution of Friedmann universes with a mixture of non-interacting matter and a ghost-like field, in a scenario analogous to that advocate…