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Chiral Perturbation Theory [PDF]
Progress in Particle and Nuclear Physics, 1993 The basic ideas and power counting rules of chiral perturbation theory are discussed. The formalism of velocity dependent fields for baryons, and for hadrons containing a heavy quark, is explained.
Manohar, Aneesh V.
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The power of perturbation theory [PDF]
Journal of High Energy Physics, 2017 We study quantum mechanical systems with a discrete spectrum. We show that the asymptotic series associated to certain paths of steepest-descent (Lefschetz thimbles) are Borel resummable to the full result.
Marco Serone +2 more
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Positivity of hexagon perturbation theory
Journal of High Energy Physics, 2018 The hexagon-form-factor program was proposed as a way to compute three-and higher-point correlation functions in N = 4 $$ \mathcal{N}=4 $$ super-symmetric Yang-Mills theory and in the dual AdS5×S5 superstring theory, by exploiting the integrability of ...
Burkhard Eden +5 more
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Second-Order Gauge-Invariant Cosmological Perturbation Theory: Current Status [PDF]
Advances in Astronomy, 2010 The current status of the recent developments of the second-order gauge-invariant cosmological perturbation theory is reviewed. To show the essence of this perturbation theory, we concentrate only on the universe filled with a single scalar field ...
Kouji Nakamura
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Redshift-space distortions in Lagrangian perturbation theory [PDF]
Journal of Cosmology and Astroparticle Physics, 2020 We present the one-loop 2-point function of biased tracers in redshift space computed with Lagrangian perturbation theory, including a full resummation of both long-wavelength (infrared) displacements and associated velocities.
Shi-Fan Chen +3 more
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Perturbation-adapted perturbation theory [PDF]
The Journal of Chemical Physics, 2022 A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Schrödinger perturbation theory. Instead of taking the operator directly from a model problem, it is constructed to be a best fit to the exact Hamiltonian within any desired functional form.
openaire +4 more sources
Dilaton chiral perturbation theory and applications [PDF]
EPJ Web of Conferences, 2022 We review dilaton chiral perturbation theory (dChPT), the effective low-energy theory for the light sector of near-conformal, confining theories. dChPT provides a systematic expansion in both the fermion mass and the distance to the conformal window.
Golterman Maarten, Shamir Yigal
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Flow-oriented perturbation theory
Journal of High Energy Physics, 2023 We introduce a new diagrammatic approach to perturbative quantum field theory, which we call flow-oriented perturbation theory (FOPT). Within it, Feynman graphs are replaced by strongly connected directed graphs (digraphs).
Michael Borinsky +3 more
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Perturbation theory with quantum signal processing [PDF]
Quantum, 2023 Perturbation theory is an important technique for reducing computational cost and providing physical insights in simulating quantum systems with classical computers.
Kosuke Mitarai +2 more
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The heuristically-based generalized perturbation theory
EPJ Nuclear Sciences & Technologies, 2021 The generalized perturbation method is described relevant to ratios of bi-linear functionals of the real and adjoint neutron fluxes of critical multiplying systems.
Gandini Augusto
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