#perturbation theory
10 papers · 1 filter
GGI Lectures on Large-Scale Structure Perturbation Theory (Effective Field Theory)
Mikhail M. Ivanov
These lecture notes introduce non-linear perturbation theory and effective field theory methods for modeling the large-scale distribution of galaxies, targeting undergraduate and e…
Nonlinear Dynamics near the Threshold of Gravitational Collapse
Jaime Redondo-Yuste, Josu C. Aurrekoetxea
The authors use numerical relativity simulations of a self‑gravitating scalar field to compare perturbative expansions around flat spacetime with full nonlinear dynamics, identifyi…
Quantum Fisher information of the Klein--Gordon, , and Dirac vacua
Preslav Asenov, Alessio Serafini
The paper computes the quantum Fisher information of vacuum states for Klein‑Gordon, φ⁴, and Dirac quantum field theories as a function of the mass parameter in various spacetime d…
Analytic backreaction of a scalar wig on a Schwarzschild black hole
Marco de Cesare, Manuel Del Piano, Carlos A. R. Herdeiro
The paper analytically computes how a massive scalar quasi‑bound state backreacts on a Schwarzschild black hole, deriving metric perturbations, horizon evolution, and the scalar’s…
Robustness of periodicity in Grover walks under a magnetic vector potential
Hiroto Sekido, Etsuo Segawa
The paper investigates how adding a magnetic vector potential affects the periodic behavior of Grover quantum walks on finite graphs, deriving conditions for robustness and showing…
Norm-Cone Conjugation and Fenchel-Type Duality Beyond Convexity
Fernando GarcÃa-Castaño, Miguel Ãngel Melguizo-Padial
The paper proposes a norm‑cone conjugation framework that extends Fenchel‑type duality to nonconvex functions, defines a corresponding subdifferential, and builds a perturbation du…