Nuclear Theory·nucl-th

Monday·November 14, 2016

12 papers—8 primary·4 cross-listed

01
Scale-setting, flavour dependence and chiral symmetry restoration
Daniele Binosi🇮🇹 · Craig D. Roberts🇺🇸 · Jose Rodriguez-Quintero🇪🇸
We determine the flavour dependence of the renormalisation-group-invariant running interaction through judicious use of both unquenched Dyson-Schwinger equation and lattice results for QCD's gauge-sector two-point functions. An important step is the introduction of a physical scale setting procedure that enables a realistic expression of the effect of different numbers of active quark flavours on the interaction. Using this running interaction in concert with a well constrained class of dressed--gluon-quark vertices, we estimate the critical number of active lighter-quarks above which dynamical chiral symmetry breaking becomes impossible: $n_{f}^{cr} \approx 9$ ; and hence in whose neighbourhood QCD is plausibly a conformal theory.
nucl-thhep-lathep-phPRD(2017)·55 citations
02
A Novel Algorithm for Extracting the Parton Distribution Amplitude from the Euclidean Bethe-Salpeter Wave Function
Fei Gao🇨🇳 · Lei Chang🇨🇳 · Yu-xin Liu🇨🇳
We propose a new numerical method to compute parton distribution amplitude(PDA) from the Euclidean Bethe-Salpeter wave function. The essential step is to extract the weight function in the Nakanishi representation of the Bethe-Salpeter wave function in Euclidean space, which is an ill-posed inversion problem, via the maximum entropy method(MEM). The Nakanishi weight function as well as the corresponding light-front PDA can be well determined. We confirm the previous works on PDA computation therein the different method has been performed.
nucl-thhep-phPLB(2017)·26 citations
03
Mean field approaches for $Ξ^{-}$ hypernuclei and current experimental data
T. T. Sun🇯🇵 · E. Hiyama🇯🇵 · H. Sagawa🇯🇵 · H.-J. Schulze🇮🇹 · J. Meng🇨🇳
Motivated by the recently observed hypernucleus (Kiso event) $_{Ξ}^{15}$ C ( $^{14}$ N $+ Ξ^{-}$ ), we identify the state of this system theoretically within the framework of the relativistic-mean-field and Skyrme-Hartree-Fock models. The $Ξ N$ interactions are constructed to reproduce the two possibly observed $Ξ^{-}$ removal energies, $4.38 \pm 0.25$ MeV or $1.11 \pm 0.25$ MeV. The present result is preferable to be $^{14} N (g.s.) + Ξ^{-} (1 p)$ , corresponding to the latter value.
nucl-thPRC(2016)·69 citations
04
Quantifying statistical uncertainties in ab initio nuclear physics using Lagrange multipliers
B. D. Carlsson
Theoretical predictions need quantified uncertainties for a meaningful comparison to experimental results. This is an idea which presently permeates the field of theoretical nuclear physics. In light of the recent progress in estimating theoretical uncertainties in ab initio nuclear physics, we here present and compare methods for evaluating the statistical part of the uncertainties. A special focus is put on the (for the field) novel method of Lagrange multipliers (LM). Uncertainties from the fit of the nuclear interaction to experimental data are propagated to a few observables in light-mass nuclei to highlight any differences between the presented methods. The main conclusion is that the LM method is more robust, while covariance based methods are less demanding in their evaluation.
nucl-thPRC(2017)·9 citations
05
Finite volume corrections and low momentum cuts in the thermodynamics of quantum gases
Krzysztof Redlich (Wroclaw U)🇵🇱 · Kacper Zalewski (Cracow, INP & Jagiellonian U.)🇵🇱
The conjecture, that the finite volume corrections to the thermodynamic functions can be correctly reproduced by using the thermodynamic limit with low particle momenta cutoff is examined in a very transparent example of an ideal boson gas in one dimension. We show that this conjecture is always true in principle, and derive convenient relations for the momentum cutoff dependence on thermal parameters in the asymptotic limits of large and small volume.
nucl-thhep-ph13 citations
06
On the PBF neutrino losses in superfluid cores of neutron stars
Lev B Leinson
Axial anomalous contributions into neutrino PBF losses due to triplet pairing of neutrons are still ignored in modeling the evolution of neutron stars. In this paper, the influence of the anomalous axial contributions onto the rate of neutron stars cooling is estimated.
nucl-thastro-ph.HE7 citations
07
Applying the Density Matrix Expansion with Coordinate-Space Chiral Interactions
A. Dyhdalo · S.K. Bogner · R.J. Furnstahl
We apply the density matrix expansion (DME) at Hartree-Fock level with long-range chiral effective field theory interactions defined in coordinate space up to next-to-next-to-leading order. We consider chiral potentials both with and without explicit Delta isobars. The challenging algebra associated with applying the DME to three-nucleon forces is tamed using a new organization scheme, which will also facilitate generalizations. We include local regulators on the interactions to mitigate the effects of singular potentials on the DME couplings and simplify the optimization of generalized Skyrme-like functionals.
nucl-thPRC(2017)·20 citations
08
Constraining gravity with hadron physics: neutron stars, modified gravity and gravitational waves
Felipe J. Llanes-Estrada (Univ. Complutense de Madrid)🇪🇸
The finding of Gravitational Waves by the aLIGO scientific and VIRGO collaborations opens opportunities to better test and understand strong interactions, both nuclear-hadronic and gravitational. Assuming General Relativity holds, one can constrain hadron physics at a neutron star. But precise knowledge of the Equation of State and transport properties in hadron matter can also be used to constrain the theory of gravity itself. I review a couple of these opportunities in the context of modified f(R) gravity, the maximum mass of neutron stars, and progress in the Equation of State of neutron matter from the chiral effective field theory of QCD.
nucl-thgr-qcEPJ Web Conf.(2017)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE