Results 81 to 90 of about 700,670 (248)

Multiple Reggeon Exchange from Summing QCD Feynman Diagrams

, 1996
Multiple reggeon exchange supplies subleading logs that may be used to restore unitarity to the Low-Nussinov Pomeron, provided it can be proven that the sum of Feynman diagrams to all orders gives rise to such multiple regge exchanges.
A. L. Mason, B. McCoy, C. S. Lam, C. S. Lam, C. Y. Lo, E. A. Kuraev, E. A. Kuraev, F. E. Low, H. Cheng, H. Cheng, L. L. Frankfurt, L. N. Lipatov, N. T. Nieh, S. Nussinov, V. S. Fadin, Y. J. Feng, Y. J. Feng   +16 more
core   +2 more sources

Transcendental numbers and the topology of three-loop bubbles [PDF]

, 1999
We present a proof that all transcendental numbers that are needed for the calculation of the master integrals for three-loop vacuum Feynman diagrams can be obtained by calculating diagrams with an even simpler topology, the topology of spectacles ...
A. A. Pivovarov, D. J. Broadhurst, D. J. Broadhurst, D. J. Broadhurst, D. J. Broadhurst, D. J. Broadhurst, D. J. Broadhurst, D. Kreimer, F. V. Tkachov, J. Fleischer, J. G. Körner, K. G. Chetyrkin, K. G. Chetyrkin, K. G. Chetyrkin, K. G. Chetyrkin, L. Avdeev, L. Avdeev, L. V. Avdeev, S. Groote, S. Groote, S. Groote, T. van Ritbergen, T. van Ritbergen   +22 more
core   +2 more sources

Matrix Theory and Feynman Diagrams [PDF]

Fortschritte der Physik, 1999
We briefly review the computation of graviton and antisymmetric tensor scattering amplitudes in Matrix Theory from a diagramatic S-Matrix point of view.
Plefka, J, Serone, Marco, Waldron, A.
openaire   +5 more sources

Geometrical splitting and reduction of Feynman diagrams [PDF]

, 2016
A geometrical approach to the calculation of N-point Feynman diagrams is reviewed. It is shown that the geometrical splitting yields useful connections between Feynman integrals with different momenta and masses.
A. I. Davydychev
semanticscholar   +1 more source

Understanding Oxide Surface Stability: Theoretical Insights From Silver Chromate

Advanced Physics Research, EarlyView.
Seven low‐index Miller surfaces, comprising 46 distinct terminations, were systematically investigated to determine their surface free energies as functions of the chemical potentials of the system constituents. The competition among these terminations gives rise to temperature‐dependent stability crossovers that dynamically reshape the surface energy ...
A. Facundes, T. T. Dorini, T. W. von Zuben, M. A. San‐Miguel   +3 more
wiley   +1 more source

The Yang-Lee zeros of the 1D Blume-Capel model on connected and non-connected rings

, 2005
We carry out a numerical and analytic analysis of the Yang-Lee zeros of the 1D Blume-Capel model with periodic boundary conditions and its generalization on Feynman diagrams for which we include sums over all connected and non-connected rings for a given
Ambjorn J, Ambjorn J, Asano T, Bachas C, Bender C M, Bessis D, Biskup M, Blume M, Blume M, Boulatov D, Capel H W, D Dalmazi, de Albuquerque L C, Dolan B P, Dunlop F, Glumac Z, Griffiths R B, Ising E, Janke W, Johnston D A, Kazakov V A, Lee T D, Luis A F Almeida, Staudacher M, Suzuki M, Suzuki M, Wang Xian-Zhi, Yang C N   +27 more
core   +1 more source

The Virial Expansion of the Hydrogen Equation of State in Comparison to PIMC Simulations: The Quasiparticle Concept, IPD, and Ionization Degree

Contributions to Plasma Physics, EarlyView.
ABSTRACT The properties of plasmas in the low‐density limit are described by virial expansions. Analytical expressions are known for the lowest virial coefficients from Green's function approaches. Recently, accurate path‐integral Monte Carlo (PIMC) simulations were performed for the hydrogen plasma at low densities by Filinov and Bonitz (Phys. Rev.
Gerd Röpke, Chengliang Lin, W. Ebeling, H. Reinholz   +3 more
wiley   +1 more source

Calculation of Infrared-Divergent Feynman Diagrams with Zero Mass Threshold [PDF]

, 1997
Two-loop vertex Feynman diagrams with infrared and collinear divergences are investigated by two independent methods. On the one hand, a method of calculating Feynman diagrams from their small momentum expansion extended to diagrams with zero mass ...
Fleischer, J., Frink, A., Kreimer, D., KÖrner, J., Schilcher, K., Smirnov, V. A., Tausk, J. B.   +6 more
core   +4 more sources

Reweighting Scheme for the Calculation of Grand‐Canonical Expectation Values in Quantum Monte Carlo Simulations With a Fermion Sign Problem

Contributions to Plasma Physics, EarlyView.
ABSTRACT Ab initio path integral Monte Carlo (PIMC) simulations constitute the gold standard for the estimation of a broad range of equilibrium properties of a host of interacting quantum many‐body systems spanning a broad range of conditions from ultracold atoms to warm dense quantum plasmas.
Paul Hamann, Jan Vorberger, Tobias Dornheim   +2 more
wiley   +1 more source

Feynman diagrams with the effective action

, 1998
A derivation is given of the Feynman rules to be used in the perturbative computation of the Green's functions of a generic quantum many-body theory when the action which is being perturbed is not necessarily quadratic.
Bordag M, Ericson T E O, Itzykson C, L L Salcedo, M J de la Plata, Negele J W, Schwinger J   +6 more
core   +1 more source