111 citations · 991 across the 28 of their papers we have counts for
27 papers
Constructing Effective Interactions via Projection-Based Inversion
Hang Yu, Serdar Elhatisari, Sebastian König +3
We present a numerical prescription for extracting continuum scattering information from discrete spectra by constraining effective interactions inspired by effective field theory…
Radius extrapolations for two-body bound states in finite volume
Anderson Taurence, Sebastian König
Simulations of quantum systems in finite volume have proven to be a useful tool for calculating physical observables. Such studies to date have focused primarily on understanding t…
Eigenvector Continuation and Projection-Based Emulators
Thomas Duguet, Andreas Ekström, Richard J. Furnstahl +2
Eigenvector continuation is a computational method for parametric eigenvalue problems that uses subspace projection with a basis derived from eigenvector snapshots from different p…
Complex scaling in finite volume
Hang Yu, Nuwan Yapa, Sebastian König
Quantum resonances, i.e., metastable states with a finite lifetime, play an important role in nuclear physics and other domains. Describing this phenomenon theoretically is general…
Magnetic dipole operator from chiral effective field theory for many-body expansion methods
R. Seutin, O. J. Hernandez, T. Miyagi +4
Many-body approaches for atomic nuclei generally rely on a basis expansion of the nuclear states, interactions, and current operators. In this work, we derive the representation of…
Role of three-body dynamics in nucleon-deuteron correlation functions
M. Viviani, S. König, A. Kievsky +3
Correlation functions of hadrons can be accessed in high-energy collisions of atomic nuclei, revealing information about the underlying interaction. This work complements experimen…
Eigenvector continuation for emulating and extrapolating two-body resonances
Nuwan Yapa, Kévin Fossez, Sebastian König
The study of open quantum systems (OQSs), i.e., systems interacting with an environment, impacts our understanding of exotic nuclei in low-energy nuclear physics, hadrons, cold-ato…
Charged-particle bound states in periodic boxes
Hang Yu, Sebastian König, Dean Lee
We consider the binding energy of a two-body system with a repulsive Coulomb interaction in a finite periodic volume. We define the finite-volume Coulomb potential as the usual Cou…
Perspectives on few-body cluster structures in exotic nuclei
D. Bazin, K. Becker, F. Bonaiti +16
It is a fascinating phenomenon in nuclear physics that states with a pronounced few-body structure can emerge from the complex dynamics of many nucleons. Such halo or cluster state…
Nuclear Forces for Precision Nuclear Physics -- a collection of perspectives
Ingo Tews, Zohreh Davoudi, Andreas Ekström +42
This is a collection of perspective pieces contributed by the participants of the Institute of Nuclear Theory's Program on Nuclear Physics for Precision Nuclear Physics which was h…
Volume extrapolation via eigenvector continuation
Nuwan Yapa, Sebastian König
We develop an extension of eigenvector continuation (EC) that makes it possible to extrapolate simulations of quantum systems in finite periodic boxes across large ranges of box si…
Constructing chiral effective field theory around unnatural leading-order interactions
Rui Peng, Songlin Lyu, Sebastian König +1
A momentum-dependent formulation based on a stationary spin-0 and isospin-1 dibaryon field is proposed to improve convergence of chiral effective field theory in the $\cs{1}{0}$ ch…
Few-body bound states and resonances in finite volume
Sebastian König
Since the pioneering work of Lüscher in the 1980s it is well known that considering quantum systems in finite volume, specifically, finite periodic boxes, can be used as a powerful…
From bound states to the continuum
Calvin W. Johnson, Kristina D. Launey, Naftali Auerbach +35
This white paper reports on the discussions of the 2018 Facility for Rare Isotope Beams Theory Alliance (FRIB-TA) topical program "From bound states to the continuum: Connecting bo…
Eigenvector Continuation as an Efficient and Accurate Emulator for Uncertainty Quantification
S. König, A. Ekström, K. Hebeler +2
First principles calculations of atomic nuclei based on microscopic nuclear forces derived from chiral effective field theory (EFT) have blossomed in the past years. A key element…
Signatures of few-body resonances in finite volume
P. Klos, S. König, H. -W. Hammer +2
We study systems of bosons and fermions in finite periodic boxes and show how the existence and properties of few-body resonances can be extracted from studying the volume dependen…
General aspects of effective field theories and few-body applications
H. -W. Hammer, Sebastian König
Effective field theory provides a powerful framework to exploit a separation of scales in physical systems. In these lectures, we discuss some general aspects of effective field th…
Nuclear Physics Around the Unitarity Limit
Sebastian König, Harald W. Grießhammer, H. -W. Hammer +1
We argue that many features of the structure of nuclei emerge from a strictly perturbative expansion around the unitarity limit, where the two-nucleon S waves have bound states at…
Deuteron electrodisintegration with unitarily evolved potentials
S. N. More, S. König, R. J. Furnstahl +1
Renormalization group (RG) methods used to soften Hamiltonians for nuclear many-body calculations change the effective resolution of the interaction. For nucleon knock-out processe…
Effective Theory of 3H and 3He
Sebastian König, Harald W. Grießhammer, H. -W. Hammer +1
We present a new perturbative expansion for pionless effective field theory with Coulomb interactions in which at leading order the spin-singlet nucleon-nucleon channels are taken…
Ultraviolet extrapolations in finite oscillator bases
S. König, S. K. Bogner, R. J. Furnstahl +2
The use of finite harmonic oscillator spaces in many-body calculations introduces both infrared (IR) and ultraviolet (UV) errors. The IR effects are well approximated by imposing a…
and Scattering to Next-to-Leading Order in Pionless Effective Field Theory
Jared Vanasse, David A. Egolf, John Kerin +2
We study the three-body systems of and scattering and demonstrate, both analytically and numerically, that a new three-body force is needed at next-to…
Precision calculation of the quartet-channel p-d scattering length
Sebastian König, H. -W. Hammer
We present a fully perturbative calculation of the quartet-channel proton--deuteron scattering length up to next-to-next-to-leading order in pionless effective field theory. We use…
Causality, universality, and effective field theory for van der Waals interactions
Serdar Elhatisari, Sebastian König, Dean Lee +1
We analyze low-energy scattering for arbitrary short-range interactions plus an attractive 1/r^6 tail. We derive the constraints of causality and unitarity and find that the van de…