scholarly journals Understanding the many-body expansion for large systems. III. Critical role of four-body terms, counterpoise corrections, and cutoffs

2017 ◽  
Vol 147 (16) ◽  
pp. 161729 ◽  
Author(s):  
Kuan-Yu Liu ◽  
John M. Herbert
Keyword(s):  
Critical Role ◽  
Many Body ◽  
Counterpoise Corrections ◽  
Large Systems ◽  
The Many

scholarly journals Universal relations for ultracold reactive molecules

2020 ◽  
Vol 6 (51) ◽  
pp. eabd4699
Author(s):  
Mingyuan He ◽  
Chenwei Lv ◽  
Hai-Qing Lin ◽  
Qi Zhou
Keyword(s):  
Critical Role ◽  
Interaction Strength ◽  
Quantum Correlations ◽  
Polar Molecules ◽  
Many Body ◽  
Density Correlation ◽  
Ultracold Polar Molecules ◽  
Unexplored Area ◽  
Many Body Systems

The realization of ultracold polar molecules in laboratories has pushed physics and chemistry to new realms. In particular, these polar molecules offer scientists unprecedented opportunities to explore chemical reactions in the ultracold regime where quantum effects become profound. However, a key question about how two-body losses depend on quantum correlations in interacting many-body systems remains open so far. Here, we present a number of universal relations that directly connect two-body losses to other physical observables, including the momentum distribution and density correlation functions. These relations, which are valid for arbitrary microscopic parameters, such as the particle number, the temperature, and the interaction strength, unfold the critical role of contacts, a fundamental quantity of dilute quantum systems, in determining the reaction rate of quantum reactive molecules in a many-body environment. Our work opens the door to an unexplored area intertwining quantum chemistry; atomic, molecular, and optical physics; and condensed matter physics.

Elemental Interfaces and Displacive Phase Transformations

2008 ◽  
Vol 59 ◽  
pp. 63-68
Author(s):  
Václav Paidar
Keyword(s):  
Phase Transformations ◽  
Structural Changes ◽  
Atomic Plane ◽  
Many Body ◽  
Single Plane ◽  
Atomistic Models ◽  
Shear Type ◽  
Hcp Structure ◽  
The Many

Two basic processes, namely shear and shuffling of atomic planes can be considered as elementary mechanisms of displacive phase transformations. The atomistic models suitable to investigate the role of interfaces in the structural changes are tested. The many-body potentials are used for the description of interatomic forces. General displacements of atomic planes are examined, i.e. γ-surface type calculations extensively used for stacking fault and lattice dislocation analysis are applied to single plane shuffling and alternate shuffling of every other atomic plane producing in combination with homogeneous deformation the hcp structure. Similar approach considering shear type planar displacements leads to the Zener path between the bcc and fcc lattices. The effect of additional deformation required to obtain the close-packed atomic arrangements is analysed.

Role of the second nearest-neighbor hoppings in a disordered Bose–Hubbard Hamiltonian in the Many-Body Localization

2020 ◽  
Vol 93 (9) ◽  
Author(s):  
Edith Djoukouo Ngueyounou ◽  
Kanabet Yapara ◽  
Celsus Bouri ◽  
Hugues Merlain Tetchou Nganso ◽  
Moïse Godfroy Kwato Njock
Keyword(s):  
Nearest Neighbor ◽  
Many Body ◽  
Hubbard Hamiltonian ◽  
The Many

scholarly journals Role of Somatostatin in the Regulation of Central and Peripheral Factors of Satiety and Obesity

2020 ◽  
Vol 21 (7) ◽  
pp. 2568
Author(s):  
Ujendra Kumar ◽  
Sneha Singh
Keyword(s):  
Food Intake ◽  
Hormonal Regulation ◽  
Critical Role ◽  
Eating Behaviour ◽  
Peripheral Tissues ◽  
Complex Process ◽  
The Many ◽  
The One ◽  
Food Seeking

Obesity is one of the major social and health problems globally and often associated with various other pathological conditions. In addition to unregulated eating behaviour, circulating peptide-mediated hormonal secretion and signaling pathways play a critical role in food intake induced obesity. Amongst the many peptides involved in the regulation of food-seeking behaviour, somatostatin (SST) is the one which plays a determinant role in the complex process of appetite. SST is involved in the regulation of release and secretion of other peptides, neuronal integrity, and hormonal regulation. Based on past and recent studies, SST might serve as a bridge between central and peripheral tissues with a significant impact on obesity-associated with food intake behaviour and energy expenditure. Here, we present a comprehensive review describing the role of SST in the modulation of multiple central and peripheral signaling molecules. In addition, we highlight recent progress and contribution of SST and its receptors in food-seeking behaviour, obesity (orexigenic), and satiety (anorexigenic) associated pathways and mechanism.

Understanding the many-body expansion for large systems. II. Accuracy considerations

2016 ◽  
Vol 144 (16) ◽  
pp. 164105 ◽  
Author(s):  
Ka Un Lao ◽  
Kuan-Yu Liu ◽  
Ryan M. Richard ◽  
John M. Herbert
Keyword(s):  
Many Body ◽  
Large Systems ◽  
The Many

scholarly journals Interatomic Forces and Bonding Mechanisms in MgO Clusters

1990 ◽  
Vol 193 ◽  
Author(s):  
Nancy F. Wright ◽  
Gayle S. Painter
Keyword(s):  
Interatomic Potentials ◽  
Many Body ◽  
Restoring Force ◽  
Mechanical Study ◽  
Quantum Mechanical Study ◽  
Force Curves ◽  
The Many ◽  
Quantum Treatment ◽  
Oxygen Ratio

ABSTRACTWe report results from a first-principles local spin density quantum mechanical study of the energetics and elastic properties of a series of magnesium-oxygen clusters of various morphologies. The role of quantum effects, e.g. covalency, in the bonding character of diatomic MgO is determined by comparison of classical and quantum restoring force curves. The dependence of binding properties on geometry and metal to oxygen ratio is determined by comparison of binding energy curves for a series of clusters. Results show that while gross features of the binding curves may be represented by simple interatomic potentials, details require the many body corrections of a full quantum treatment.

Community supports for people affected by cancer

2013 ◽  
Author(s):  
Michael Jefford
Keyword(s):  
Clinical Setting ◽  
Health Care Professionals ◽  
Critical Role ◽  
Critical Issue ◽  
Care Needs ◽  
The Many ◽  
Additional Support ◽  
Community Supports

Chapter 11 considers the supportive care needs of people affected by cancer – not just those who are told that they have a cancer diagnosis, but also their family members and friends, who are also often profoundly affected. The critical role of health care professionals in meeting the needs of all people affected by cancer is underscored. The many and varied sources of additional support provided outside the clinical setting are then described. The review focuses upon the needs of adults with cancer, though many of the issues and examples are also applicable to children, adolescents, and young adults with cancer. A critical issue is how to best integrate clinical programmes with the variety of supports outside the clinical setting.

scholarly journals PROBING THE PHASES OF QCD IN ULTRA-RELATIVISTIC NUCLEAR COLLISIONS

2005 ◽  
Vol 20 (16) ◽  
pp. 3777-3782 ◽  
Author(s):  
IVAN VITEV
Keyword(s):  
Nuclear Physics ◽  
High Energy Physics ◽  
Critical Role ◽  
High Energy ◽  
Many Body ◽  
Nuclear Collisions ◽  
The Status ◽  
Relativistic Nuclear Collisions ◽  
Energy Physics

The status of RHIC theory and phenomenology is reviewed with an emphasis on the indications for the creation of a new deconfined state of matter. The critical role of high energy nuclear physics in the development of theoretical tools that address various aspects of the QCD many body dynamics is highlighted. The perspectives for studying nuclear matter under even more extreme conditions at the LHC and the overlap with high energy physics is discussed.

Role of the valence-band mass on the many-body optical properties of a two-dimensional electron gas

1998 ◽  
Vol 249-251 ◽  
pp. 603-606
Author(s):  
H.P van der Meulen ◽  
J Rubio ◽  
J.M Calleja ◽  
C Tejedor ◽  
F Rodriguez ◽  
...  
Keyword(s):  
Optical Properties ◽  
Valence Band ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Many Body ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas ◽  
The Many
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