scholarly journals Testing a new method for scattering in finite volume in the $$\phi ^4$$ theory

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
Marco Garofalo ◽  
Fernando Romero-López ◽  
Akaki Rusetsky ◽  
Carsten Urbach
Keyword(s):  
High Energy Phys ◽  
Finite Volume ◽  
Scattering Length ◽  
High Energy ◽  
New Method ◽  
Link Type ◽  
Alternative Proposal

AbstractWe test an alternative proposal by Bruno and Hansen (J High Energy Phys 2021(6), 10.1007/JHEP06(2021)043, 2021) to extract the scattering length from lattice simulations in a finite volume. For this, we use a scalar $$\phi ^4$$ ϕ 4 theory with two mass nondegenerate particles and explore various strategies to implement this new method. We find that the results are comparable to those obtained from the Lüscher method, with somewhat smaller statistical uncertainties at larger volumes.

scholarly journals More on the flavor dependence of mϱ/fπ

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Andrey Yu. Kotov ◽  
Daniel Nogradi ◽  
Kalman K. Szabo ◽  
Lorinc Szikszai
Keyword(s):  
Gauge Theory ◽  
Symmetry Breaking ◽  
Finite Volume ◽  
Continuum Limit ◽  
Low Energy ◽  
Translational Symmetry ◽  
Fundamental Representation ◽  
Staggered Fermions ◽  
Link Type ◽  
Volume Effects

Abstract In previous work, [arXiv:1905.01909], we have calculated the mϱ/fπ ratio in the chiral and continuum limit for SU(3) gauge theory coupled to Nf = 2, 3, 4, 5, 6 fermions in the fundamental representation. The main result was that this ratio displays no statistically significant Nf-dependence. In the present work we continue the study of the Nf-dependence by extending the simulations to Nf = 7, 8, 9, 10. Along the way we also study in detail the Nf-dependence of finite volume effects on low energy observables and a particular translational symmetry breaking unphysical, lattice artefact phase specific to staggered fermions.

scholarly journals May the four be with you: novel IR-subtraction methods to tackle NNLO calculations

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
W. J. Torres Bobadilla ◽  
G. F. R. Sborlini ◽  
P. Banerjee ◽  
S. Catani ◽  
A. L. Cherchiglia ◽  
...  
Keyword(s):  
High Energy Physics ◽  
High Energy ◽  
Higher Order ◽  
Field Theories ◽  
Quantum Field Theories ◽  
Quantum Field ◽  
Link Type ◽  
Mathematical Properties ◽  
Energy Physics ◽  
The Way

AbstractIn this manuscript, we report the outcome of the topical workshop: paving the way to alternative NNLO strategies (https://indico.ific.uv.es/e/WorkStop-ThinkStart_3.0), by presenting a discussion about different frameworks to perform precise higher-order computations for high-energy physics. These approaches implement novel strategies to deal with infrared and ultraviolet singularities in quantum field theories. A special emphasis is devoted to the local cancellation of these singularities, which can enhance the efficiency of computations and lead to discover novel mathematical properties in quantum field theories.

scholarly journals Surface Modification of Dielectric Substrates by Broad Beams of High-Energy Atoms of Inert Gases

Technologies ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 43
Author(s):  
Alexander Metel ◽  
Sergey Grigoriev ◽  
Marina Volosova ◽  
Yury Melnik ◽  
Enver Mustafaev
Keyword(s):  
Glow Discharge ◽  
High Energy ◽  
Inert Gases ◽  
New Method ◽  
Neutral Beam ◽  
Glow Discharge Plasma ◽  
Parallel Plates ◽  
Shift Measurement ◽  
Dielectric Substrates ◽  
Angle Scattering

We present a new method to generate a neutral beam for surface treatment of materials by fast atoms of inert gases. The new method allows for treatment at lower pressures enlarging the scope for glow discharge applications. To generate the monoenergetic neutral beam, a grid composed of parallel plates is placed inside a vacuum chamber, a glow discharge plasma was generated, and a beam was formed by pulsing the grid to 30 kV to extract ions from the glow discharge. The ions were then neutralized by small-angle scattering at the surfaces of the grid. By applying the high voltage for 50 µs with a repetition frequency of 50 Hz, heating of the target could be limited to 100 °C (instead of 700 °C when running continuously). We present results showing the uniformity of the created beam and its energy distribution using Doppler-shift measurement. Finally, we show friction measurement of treated alumina pieces as a working example of an application of this technology.

A new method to search for high energy gamma rays by track-calorimeter detectors at a high mountain

1991 ◽  
Author(s):  
F. Kajino ◽  
K. Hibino ◽  
M. Nishizawa ◽  
M. Ohnishiu ◽  
M. Sakata ◽  
...  
Keyword(s):  
Gamma Rays ◽  
High Energy ◽  
New Method ◽  
High Mountain ◽  
High Energy Gamma ◽  
Energy Gamma

System Configuration and Performance Studies of Solid Oxide Fuel Cell -Gas Turbine Hybrid Cycle

2007 ◽  
Author(s):  
Wei Jiang ◽  
Ruxian Fang ◽  
Jamil A. Khan ◽  
Roger A. Dougal
Keyword(s):  
Fuel Cell ◽  
Power Plant ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
Finite Volume ◽  
Hybrid System ◽  
High Energy ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Hybrid Cycle

Fuel Cell is widely regarded as a potential alternative in the electric utility due to its distinct advantages of high energy conversion efficiency, low environmental impact and flexible uses of fuel types. In this paper we demonstrate the enhancement of thermal efficiency and power density of the power plant system by incorporating a hybrid cycle of Solid Oxide Fuel Cell (SOFC) and gas turbine with appropriate configurations. In this paper, a hybrid system composed of SOFC, gas turbine, compressor and high temperature heat exchanger is developed and simulated in the Virtual Test Bed (VTB) computational environment. The one-dimensional tubular SOFC model is based on the electrochemical and thermal modeling, accounting for the voltage losses and temperature dynamics. The single cell is discretized using a finite volume method where all the governing equations are solved for each finite volume. Simulation results show that the SOFC-GT hybrid system could achieve a 70% total electrical efficiency (LHV) and an electrical power output of 853KW, around 30% of which is produced by the power turbine. Two conventional power plant systems, i.e. gas turbine recuperative cycle and pure Fuel Cell power cycle, are also simulated for the performance comparison to validate the improved performance of Fuel Cell/Gas Turbine hybrid system. Finally, the dynamic behavior of the hybrid system is presented and analyzed based on the system simulation.

A Comprehensive Utilization of Laterite Nickel Ore

2011 ◽  
Vol 415-417 ◽  
pp. 934-937
Author(s):  
Yan Liu ◽  
Yan Wen Tian ◽  
Yu Chun Zhai
Keyword(s):  
Energy Consumption ◽  
Silicon Dioxide ◽  
Magnetic Separation ◽  
Sodium Silicate ◽  
High Energy ◽  
New Method ◽  
Comprehensive Utilization ◽  
Silicate Structure ◽  
Leaching Solution ◽  
High Energy Consumption

Nickel is difficult to be enriched from laterite nickel ore with mineral processing. The traditional processes used for manufacturing nickel need high energy consumption and yield a large amount of metallurgy waste residue. A new method was developed. Nickel and iron was enriched firstly by leaching laterite nickel ore in concentrated alkali solution. In the process, silicon entered to the solution in the form of sodium silicate, and nickel and iron were remained in the residue in form of simple oxides due to the destroying of silicate structure. Ferronickel was obtained by magnetic separation after reducing the residue with carbon. The silicon dioxide was prepared using carbonation decomposition from the leaching solution. The alkali used in the leaching process was recycled and reused using causticizing technology.

scholarly journals CHARACTER EXPANSION FOR HOMFLY POLYNOMIALS III: ALL 3-STRAND BRAIDS IN THE FIRST SYMMETRIC REPRESENTATION

2012 ◽  
Vol 27 (19) ◽  
pp. 1250099 ◽  
Author(s):  
H. ITOYAMA ◽  
A. MIRONOV ◽  
A. MOROZOV ◽  
AND. MOROZOV
Keyword(s):  
General Formula ◽  
High Energy Phys ◽  
High Energy ◽  
Reflection Symmetry ◽  
Symmetric Representation ◽  
Knot Invariants ◽  
Time Variables ◽  
Close Relatives ◽  
Figure Eight Knot ◽  
Homfly Polynomials

We continue the program of systematic study of extended HOMFLY polynomials, suggested in [A. Mironov, A. Morozov and And. Morozov, arXiv:1112.5754] and [A. Mironov, A. Morozov and And. Morozov, J. High Energy Phys. 03, 034 (2012), arXiv:1112.2654]. Extended polynomials depend on infinitely many time-variables, are close relatives of integrable τ-functions, and depend on the choice of the braid representation of the knot. They possess natural character decompositions, with coefficients which can be defined by exhaustively general formula for any particular number m of strands in the braid and any particular representation R of the Lie algebra GL(∞). Being restricted to "the topological locus" in the space of time-variables, the extended HOMFLY polynomials reproduce the ordinary knot invariants. We derive such a general formula, for m = 3, when the braid is parametrized by a sequence of integers (a1, b1, a2, b2, …) and for the first nonfundamental representation R = [2]. Instead of calculating the mixing matrices directly, as suggested [A. Mironov, A. Morozov and And. Morozov, J. High Energy Phys. 03, 034 (2012), arXiv:1112.2654], we deduce them from comparison with the known answers for torus and composite knots. A simple reflection symmetry converts the answer for the symmetric representation [2] into that for the antisymmetric one [1, 1]. The result applies, in particular, to the figure eight knot 41, and was further extended to superpolynomials in arbitrary symmetric and antisymmetric representations in H. Itoyama, A. Mironov, A. Morozov and And. Morozov, arXiv:1203.5978.

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