Explanipedia

Calculation of Dynamical Response Functions Using a Bound-State Method Open

Niels R. Walet, Jagjit Singh, Johannes Kirscher, Michael C. Birse, Harald W. Grießhammer , et al. · 2023

Calculation of Dynamical Response Functions Using a Bound-state Method Open

Niels R. Walet, Jagjit Singh, Johannes Kirscher, Michael C. Birse, Harald W. Grießhammer , et al. · 2023

We investigate a method to extract response functions (dynamical polarisabilities) directly from a bound-state approach applied to calculations of perturbation-induced reactions. The use of a square-integrable basis leads to a response in …

Optical potentials, retarded Green's functions, and nonorthogonality Open

Michael C. Birse · 2020

An approach is outline to constructing an optical potential that includes the\neffects of antisymmetry and target recoil. it is based on the retarded Green's\nfunction, which could make it a better starting point for applications to\ndirec…

A functional renormalization group approach to thermodynamics of weakly interacting Bose gases: from linear to hydrodynamic fluctuations Open

Felipe Isaule, Michael C. Birse, Niels R. Walet · 2019

We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields developed previously that interpolates between a Cartesian…

Renormalisation group analysis of electromagnetic couplings in the pionless effective field theory Open

A. N. Kvinikhidze, Michael C. Birse · 2018

Application of the functional renormalization group to Bose gases: From linear to hydrodynamic fluctuations Open

Felipe Isaule, Michael C. Birse, Niels R. Walet · 2018

We study weakly interacting Bose gases using the functional renormalization group with a hydrodynamic effective action. We use a scale-dependent parametrization of the boson fields that interpolates between a Cartesian representation at hi…

Comment on “Nucleon spin-averaged forward virtual Compton tensor at large ” Open

Michael C. Birse, Judith A. McGovern · 2018

In recent work, Hill and Paz apply the operator product expansion to forward\ndoubly virtual Compton scattering. The resulting large-$Q^2$ form of the\namplitude $W_1(0,Q^2)$ is compatible with the one we obtain by extrapolation of\nlow-$Q…

Potential problems with interpolating fields Open

Michael C. Birse · 2017

Description of light nuclei in pionless effective field theory using the stochastic variational method Open

Vadim Lensky, Michael C. Birse, Niels R. Walet · 2016

We construct a coordinate-space potential based on pionless effective field theory (EFT) with a Gaussian regulator. Charge-symmetry breaking is included through the Coulomb potential and through two- and three-body contact interactions. St…

Four-boson bound states from a functional renormalization group Open

Benjamín Jaramillo Ávila, Michael C. Birse · 2015

We use the functional renormalisation group to study the spectrum of three-\nand four-body states in bosonic systems around the unitary limit. Our effective\naction includes all energy-independent contact interactions in the four-atom\nsec…

Power counting for three-body decays of a near-threshold state Open

M. Alhakami, Michael C. Birse · 2015

We propose a new power counting for the effective field theory describing a near-threshold state with unstable constituents, such as the X(3872) meson. In this counting, the momenta of the heavy particles, the pion mass and the excitation …

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