scholarly journals The Nuclear Matter Density Functional under the Nucleonic Hypothesis

Universe ◽  
2021 ◽  
Vol 7 (10) ◽  
pp. 373
Author(s):  
Hoa Dinh Thi ◽  
Chiranjib Mondal ◽  
Francesca Gulminelli
Keyword(s):  
Nuclear Physics ◽  
Density Functional ◽  
Degrees Of Freedom ◽  
Dense Matter ◽  
Effective Field ◽  
Present Knowledge ◽  
Nuclear Mass ◽  
Nuclear Matter Density ◽  
The Core ◽  
Low Energy Nuclear Physics

A Bayesian analysis of the possible behaviors of the dense matter equation of state informed by recent LIGO-Virgo as well as NICER measurements reveals that all the present observations are compatible with a fully nucleonic hypothesis for the composition of dense matter, even in the core of the most massive pulsar PSR J0740+6620. Under the hypothesis of a nucleonic composition, we extract the most general behavior of the energy per particle of symmetric matter and density dependence of the symmetry energy, compatible with the astrophysical observations as well as our present knowledge of low-energy nuclear physics from effective field theory predictions and experimental nuclear mass data. These results can be used as a null hypothesis to be confronted with future constraints on dense matter to search for possible exotic degrees of freedom.

scholarly journals Quantum Monte Carlo Methods in Nuclear Physics: Recent Advances

2019 ◽  
Vol 69 (1) ◽  
pp. 279-305 ◽  
Author(s):  
J.E. Lynn ◽  
I. Tews ◽  
S. Gandolfi ◽  
A. Lovato
Keyword(s):  
Monte Carlo ◽  
Quantum Monte Carlo ◽  
Nuclear Physics ◽  
Degrees Of Freedom ◽  
Effective Field ◽  
Binding Energies ◽  
Neutron Matter ◽  
Light Nuclei ◽  
Medium Mass ◽  
Recent Developments

In recent years, the combination of precise quantum Monte Carlo (QMC) methods with realistic nuclear interactions and consistent electroweak currents, in particular those constructed within effective field theories (EFTs), has led to new insights in light and medium-mass nuclei, neutron matter, and electroweak reactions. For example, with the same chiral interactions, QMC calculations can reproduce binding energies and radii for light nuclei, n–α scattering phase shifts, and the neutron matter equation of state. This compelling new body of work has been made possible both by advances in QMC methods for nuclear physics, which push the bounds of applicability to heavier nuclei and to asymmetric nuclear matter, and by the development of local chiral EFT interactions up to next-to-next-to-leading order and minimally nonlocal interactions including Δ degrees of freedom. In this review, we discuss these recent developments and give an overview of the exciting results for nuclei, neutron matter and neutron stars, and electroweak reactions.

scholarly journals Modern topics in theoretical nuclear physics

2007 ◽  
Vol 85 (3) ◽  
pp. 219-230 ◽  
Author(s):  
B K Jennings ◽  
A Schwenk
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Nuclear Physics ◽  
Condensed Matter ◽  
Effective Field ◽  
Low Energy ◽  
Many Body ◽  
The Past ◽  
Nuclear Systems ◽  
Low Energy Nuclear Physics

Over the past five years there have been profound advances in nuclear physics based on effective field theory and the renormalization group. In this review, we summarize these advances and discuss how they impact our understanding of nuclear systems and experiments that seek to unravel their unknowns. We discuss future opportunities and focus on modern topics in low-energy nuclear physics, with special attention on the strong connections to many-body atomic and condensed-matter physics, as well as to astrophysics. This makes it an exciting era for nuclear physics. PACS Nos.: 21.60.–n, 21.30.Fe

scholarly journals The Evolution of Soft Collinear Effective Theory

2015 ◽  
Vol 37 ◽  
pp. 1560045 ◽  
Author(s):  
Christopher Lee
Keyword(s):  
Cross Sections ◽  
Nuclear Physics ◽  
Degrees Of Freedom ◽  
Heavy Ion ◽  
High Energy ◽  
Effective Field ◽  
Effective Theory ◽  
Ion Collisions ◽  
Soft Collinear Effective Theory ◽  
Single Scale

Soft Collinear Effective Theory (SCET) is an effective field theory of Quantum Chromodynamics (QCD) for processes where there are energetic, nearly lightlike degrees of freedom interacting with one another via soft radiation. SCET has found many applications in high-energy and nuclear physics, especially in recent years the physics of hadronic jets in e+e-, lepton-hadron, hadron-hadron, and heavy-ion collisions. SCET can be used to factorize multi-scale cross sections in these processes into single-scale hard, collinear, and soft functions, and to evolve these through the renormalization group to resum large logarithms of ratios of the scales that appear in the QCD perturbative expansion, as well as to study properties of nonperturbative effects. We overview the elementary concepts of SCET and describe how they can be applied in high-energy and nuclear physics.

scholarly journals What can neutron stars reveal about the equation of state of dense matter?

2020 ◽  
Vol 235 ◽  
pp. 07002
Author(s):  
Ingo Tews
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Physics ◽  
Nuclear Astrophysics ◽  
Dense Matter ◽  
Effective Field ◽  
Chiral Effective Field Theory ◽  
Astrophysical Objects ◽  
R Process

Neutron stars are astrophysical objects of extremes, reaching the highest densities we can observe in the cosmos, and probing matter under conditions that cannot be recreated in terrestrial experiments. In August 2017, the first neutron-star merger has been observed, which provided compelling evidence that these events are an important site for r-process nucleosynthesis. Furthermore, the gravitational-wave signal of such events might shed light upon the nature of strongly interacting matter in the neutron-star core. To understand these remarkable events, reliable nuclear physics input is essential. In this contribution, I explain how to use chiral effective field theory and advanced many-body methods to provide a consistent and systematic approach to strongly inter- acting systems from nuclei to neutron stars with controlled theoretical uncertainties. I will discuss recent results for the equation of state relevant for the nuclear astrophysics of neutron stars and neutron-star mergers.

scholarly journals Recent Developments in Nuclear Physics

1993 ◽  
Vol 46 (1) ◽  
pp. 15
Author(s):  
Torleif EO Ericson
Keyword(s):  
Nuclear Physics ◽  
Degrees Of Freedom ◽  
Pion Mass ◽  
Effective Field ◽  
Collective State ◽  
Exchange Reactions ◽  
Propagation Of Light ◽  
Recent Developments ◽  
Virtual Pion ◽  
Model Independent

Nuclei exhibit features that are described in superficially contradictory terms according to the different degrees of freedom that are excited by probes of different scale in space and in time. After giving some examples I concentrate on the hadron degrees of freedom such as the nucleon, the pion and the .6. isobar. These are the effective degrees of freedom on the level of intermediate resolution: about 0�5-1 fm in distance and correspondingly in time. A prime example is the deuteron :which has a nearly model-independent description in terms of pion physics to very high precision. In nuclear matter the pion propagates in close analogy to the propagation of light in a dielectric. This permits the explanation of a number of features in nuclei related to the chiral symmetry limit in which the pion mass vanishes. A consequence of this description is the analogy of the equations for the pion and its effective field with the Maxwell equations for a dielectric. A pionic collective mode should appear strongly and with characteristic properties for a well chosen probe. It is difficult to explore its properties directly and in particular physical pions are not useful for this purpose. I will discuss different alternatives involving 'virtual pion beams'. There is recent evidence for such a collective state in forward charge exchange reactions throughout the periodic system.

scholarly journals From Center-Vortex Ensembles to the Confining Flux Tube

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 253
Author(s):  
David R. Junior ◽  
Luis E. Oxman ◽  
Gustavo M. Simões
Keyword(s):  
Degrees Of Freedom ◽  
String Tension ◽  
Effective Field ◽  
Scaling Properties ◽  
Flux Tubes ◽  
Topological Solitons ◽  
Yang Mills ◽  
Center Vortex ◽  
Asymptotic Scaling ◽  
The Continuum

In this review, we discuss the present status of the description of confining flux tubes in SU(N) pure Yang–Mills theory in terms of ensembles of percolating center vortices. This is based on three main pillars: modeling in the continuum the ensemble components detected in the lattice, the derivation of effective field representations, and contrasting the associated properties with Monte Carlo lattice results. The integration of the present knowledge about these points is essential to get closer to a unified physical picture for confinement. Here, we shall emphasize the last advances, which point to the importance of including the non-oriented center-vortex component and non-Abelian degrees of freedom when modeling the center-vortex ensemble measure. These inputs are responsible for the emergence of topological solitons and the possibility of accommodating the asymptotic scaling properties of the confining string tension.

scholarly journals MADNESS applied to density functional theory in chemistry and nuclear physics

2007 ◽  
Vol 78 ◽  
pp. 012018 ◽  
Author(s):  
G I Fann ◽  
R J Harrison ◽  
G Beylkin ◽  
J Jia ◽  
R Hartman-Baker ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Nuclear Physics ◽  
Density Functional ◽  
Functional Theory
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