Results 81 to 90 of about 71,271 (229)

Self-dual noncommutative \phi^4-theory in four dimensions is a non-perturbatively solvable and non-trivial quantum field theory

, 2013
We study quartic matrix models with partition function Z[E,J]=\int dM \exp(trace(JM-EM^2-(\lambda/4)M^4)). The integral is over the space of Hermitean NxN-matrices, the external matrix E encodes the dynamics, \lambda>0 is a scalar coupling constant and ...
A. Connes, A.A. Belavin, A.S. Wightman, A.S. Wightman, C. Avramescu, C.R. Hagen, D. Friedan, D.C. Brydges, D.J. Gross, D.J. Gross, D.J. Gross, E. Brezin, E. Ising, E. Witten, E. Witten, E.H. Lieb, F.G. Tricomi, G.’t. Hooft, G.’t. Hooft, H. Bethe, Harald Grosse, I.S. Gradshteyn, J. Feldman, J. Fröhlich, J. Ginibre, J. Glimm, J. Glimm, J. Glimm, J. Schwinger, J. Wess, J.S. Feldman, J.S. Schwinger, K. Gawedzki, K. Johnson, K. Osterwalder, K. Osterwalder, K.G. Wilson, L. Onsager, L.D. Faddeev, M. Aizenman, M. Kac, M. Kontsevich, M.R. Douglas, N.I. Muskhelishvili, R. Haag, R. Haag, R.F. Streater, R.J. Baxter, R.J. Baxter, Raimar Wulkenhaar, T. Carleman, T. Filk, V. Rivasseau, V. Rivasseau, W.E. Thirring   +54 more
core   +1 more source

An Alternative Approach to Energy Eigenvalue Problems of Anharmonic Potentials

Advances in Mathematical Physics, 2014
Energy eigenvalues of quartic and sextic type anharmonic potentials are obtained by using an alternative method called asymptotic Taylor expansion method (ATEM) which is an approximate approach based on the asymptotic Taylor series expansion of a ...
Okan Ozer, Halide Koklu
doaj   +1 more source

Inverse Design of Mirror‐Symmetric Disordered Systems for Broadband Perfect Transmission

Laser &Photonics Reviews, EarlyView.
This work introduces an inverse design approach to achieve broadband perfect wave transmission in mirror‐symmetric disordered media. Leveraging symmetry simplifies optimization and enables control of multiple reflectionless states. Experiments in microwave waveguides confirm the design of exceptional points, bandpass filters, and broadband quasi ...
Zhazira Zhumabay, Clément Ferise, Vincent Pagneux, Stefan Rotter, Matthieu Davy   +4 more
wiley   +1 more source

Developing a Heterogeneous Attenuation Model for Fiber Reinforced Thermoplastic Composites in the Kilohertz Region of the Ultrasonic Spectrum

Polymer Composites, EarlyView.
Acquisition, filtering and modeling by genetic programming (tree pattern) of the acoustic signal for fiber‐filled composites. ABSTRACT This study experimentally investigated the discrete phase contributions of fibers and entrapped air on the attenuation spectrum of a fiber‐filled thermoplastic composite and derives a mathematical expression for sound ...
Austin D. Bedrosian, Andrew Hrymak, Gisela Lanza, Michael R. Thompson   +3 more
wiley   +1 more source

Quantum interference in the classically forbidden region: a parametric oscillator

, 2007
We study tunneling between period two states of a parametrically modulated oscillator. The tunneling matrix element is shown to oscillate with the varying frequency of the modulating field.
A. P. Dmitriev, A. P. Dmitriev, L. D. Landau, L. D. Landau, M. I. Dykman, M. I. Dykman, M. I. Dykman, M. Marthaler, V. N. Sazonov, V. N. Sazonov   +9 more
core   +1 more source

Lindbladian dissipation of strongly-correlated quantum matter

Physical Review Research, 2022
We propose the Sachdev-Ye-Kitaev Lindbladian as a paradigmatic solvable model of dissipative many-body quantum chaos. It describes N strongly coupled Majorana fermions with random all-to-all interactions, with unitary evolution given by a quartic ...
Lucas Sá, Pedro Ribeiro, Tomaž Prosen
doaj   +1 more source

Status and future of seed conservation of threatened plants in the post‐2020 era

PLANTS, PEOPLE, PLANET, EarlyView.
Ambitious targets have been set to backup seeds of threatened plants by the global strategy for plant conservation (GSPC), but it is unclear in how far these targets have been met and how seed collection should be organized to meet future challenges. Here, we provide an overview of the status of 44 countries in achieving seed conservation targets.
Andreas Ensslin, Adelaide Clemente, Udayangani Liu, Elke Zippel, Carla Pinto‐Cruz, Carolina Sanchez Romero, Simone Schneider, Agustí Agut Escrig, Charlotte Allender, Külli Annamaa, Marina Antic, Bertille Asset, Gianluigi Bacchetta, Oz Baranzani, Anamaria Barata, Philippe Bardin, Joze Bavcon, Anabela D. F. Belo, Marina Belovarska, Karim Benkhelifa, Christian Berg, Karl‐Georg Bernhardt, Marcin Beza, Kristina Bjureke, Sina Bohm, Peter Borgmann, Josep Borrell, Stéphane Buord, Jocelyne Cambecedes, Francesca Carruggio, Angelino Carta, Pedro Casimiro, Ted Chapman, Iveta Cicova, Regis Crisnaire, Antonia Cristaudo, Lucia De la Rosa, Maîte Delmas, Gergana Desheva, Valter Di Cecco, Luciano Di Martino, Katia Diadema, Lara Dixon, Denise Dostatny, Marie Duval, Roland K. Eberwein, Mikel Etxeberria‐Okariz, Caroline Favier, Nick Fenby, Mariana P. Fernandes, Inmaculada Ferrando‐Pardo, Pablo Ferrer, Noémie Fort, Luigi Forte, Catia F. Freitas, Agnese Gailite, Katarzyna Galej‐Ciwis, Rosa Maria Garcia, Ana Irene García‐del Bao, Catherine Gautier, Bronislovas Gelvonauskis, Gian Petro Giusso del Galdo, Miguel Angel González Pérez, Johan Gourvil, Luisa Gouveia, Thierry Helminger, Brais Hermosilla Lorenzo, Laetitia Hugot, Marko Hyvärinen, Ignac Janžekovič, Andreas König, Nikos Krigas, Emilio Laguna, Ludivine Lapébie, Denis Larpin, Maja Lazarević, Dikla Lifshitz, Vincent Lipa, Carlos Lobo, Ulrike Lohwasser, Sandrine Loriot, Sara Magrini, Francesca Mantino, Mauro Mariotti, Evi Matiatou, Lubomir Mendel, Marine Millet, Mari Miranto, Andrea Mondoni, Santiago Moreno Vázquez, Valeria Negri, Peter Nick, Maciej Niemczyk, Humberto Nobrega, Pawel Olejniczak, Małgorzata Pałucka, Katerina Papanastasi, Ioanna Papanikolaou, Miguel A. A. Pinheiro de Carvalho, Marco Porceddu, Sotirios Porevis, Peter Poschlod, Lorenzo Raggi, Sarmite Rancane, Leonid Rasran, Blanka Ravnjak, Stéphane Rivière, Axelle Roumier, Anna Rucińska, Felix Schlatti, Marco Schmidt, Guy‐Xavier Seznec, Manuela Sim‐Sim, Ana Luisa Soares, Nora Stoeckl, Silvia Strajeru, Gitana Stukeniene, Andrej Šušek, Andreas Titze, Sarah Trinder, Zlatina Tsvetanova, Theo Van Hintum, Nils Van Rooijen, Magdalena Vicens Fornés, Mariacristina Villani, Silvia Villegas, Fiona J. White, Sabine Zachago, Elena Zappa, Vince Zsigmond, Sandrine Godefroid   +130 more
wiley   +1 more source

Ising model on nonorientable surfaces: Exact solution for the Moebius strip and the Klein bottle

, 2000
Closed-form expressions are obtained for the partition function of the Ising model on an M x N simple-quartic lattice embedded on a Moebius strip and a Klein bottle for finite M and N. The finite-size effects at criticality are analyzed and compared with
A.E. Ferdinand, A.S. Ferdinand, B. Kaufman, F. Y. Wu, G. Tesler, H.W.J. Blöte, I. S. Gradshteyn, L. Onsager, P.W. Kasteleyn, P.W. Kasteleyn, W.-J. Tzeng, W.T. Lu, W.T. Lu, Wentao T. Lu   +13 more
core   +1 more source

A Rail Fault Diagnosis Method Based on Quartic C² Hermite Improved Empirical Mode Decomposition Algorithm

Sensors, 2019
For compound fault detection of high-speed rail vibration signals, which presents a difficult problem, an early fault diagnosis method of an improved empirical mode decomposition (EMD) algorithm based on quartic C2 Hermite interpolation is presented ...
Hanzhong Liu, Chaoxuan Qin, Ming Liu
doaj   +1 more source

Dynamics and model representation of two contrasting extreme precipitation events in the Sahel

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Hovmöller diagrams of the two investigated extreme precipitation events in Mali are shown for (i) IMERG observations, and ICOsahedral Nonhydrostatic model (ICON) runs with parameterization of explicit convection (ii) enabled and (iii) disabled. This work highlights that the commonly perceived benefit of using explicit convection in a state‐of‐the‐art ...
Souleymane Sanogo, Marlon Maranan, Andreas H. Fink, Beth J. Woodhams, Peter Knippertz   +4 more
wiley   +1 more source