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Introduction to Effective Field Theory
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This review summarizes Effective Field Theory techniques, which are the modern theoretical tools for exploiting the existence of hierarchies of scale in a physical problem. The general theoretical framework is described, and explicitly evaluated for a simple model. Power-counting results are illustrated for a few cases of practical interest, and several applications to Quantum Electrodynamics are described.
Forward citations
Cited by 9 Pith papers
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Bounds on nonlinear electrodynamics via resummed relative entropy
Non-negativity of resummed relative entropy in background EM fields imposes sign constraints on EFT operators and signals physical instabilities such as the Schwinger effect.
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Exact, non-singular black holes from a phantom DBI Field as primordial dark matter
Exact non-singular black holes from the phantom DBI field evaporate to gram-mass relics, opening a new mass window for primordial black holes as dark matter.
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Precision Unitarity Calculations in Inflationary Models
Full S-matrix unitarity calculations show the cut-off in single-field nonminimal inflation rises to about 20 M_Pl/ξ for small couplings, while multifield kinetic interactions keep the cut-off near M_Pl/ξ.
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Reheating as a variational probe of cosmological observables
Reheating is formulated as a regularized variational problem in equation-of-state space whose extremal histories are selected by different cosmological observables.
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Bounds on nonlinear effective field theories via resurgent relative entropy
Resummed relative entropy fixes the sign of asymptotic growth of EFT coefficients and signals instabilities, with the Schwinger effect in fermionic QED as a concrete example obtained via Euclidean-to-Minkowski analyti...
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Custodial Naturalness
Custodial Naturalness uses classical scale invariance plus a custodial SO(6) symmetry to make the Higgs a naturally light pseudo-Goldstone boson, with testable new particle predictions.
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Quintessential $\alpha$-attractors fit DESI
α-attractor quintessence models approximate axion-like potentials and fit DESI dynamical dark energy data, preferring α of order 1 via a simple fa-α relation.
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Effective Field Theories for Material Media
Spacetime-symmetry-breaking Goldstone EFTs systematically describe bulk and localized excitations of solids, fluids, and superfluids, with new thermodynamic identifications and corrected scattering rates.
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In-In EFT
An EFT for in-in correlators is defined by matching the full theory's real-time correlators, leading to operators with boundary terms and odd time derivatives.
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