TY - JOUR AU - Tulipánt, Zoltán AU - Giordano, Matteo AU - Kapás, Kornél AU - Katz, Sándor AU - Pásztor, Attila TI - Exponential improvement of the sign problem via contour deformations in the 2+1D XY model at non-zero density JF - POS - PROCEEDINGS OF SCIENCE J2 - POS - PROCEEDINGS OF SCIENCE VL - 430 PY - 2022 SN - 1824-8039 DO - 10.22323/1.430.0161 UR - https://m2.mtmt.hu/api/publication/33603628 ID - 33603628 LA - English DB - MTMT ER - TY - JOUR AU - Giordano, Matteo AU - Kapás, Kornél AU - Katz, Sándor AU - Pásztor, Attila AU - Tulipánt, Zoltán TI - Exponential reduction of the sign problem at finite density in the 2+1D XY model via contour deformations JF - PHYSICAL REVIEW D J2 - PHYS REV D VL - 106 PY - 2022 IS - 5 SN - 2470-0010 DO - 10.1103/PhysRevD.106.054512 UR - https://m2.mtmt.hu/api/publication/33116788 ID - 33116788 LA - English DB - MTMT ER - TY - CONF AU - Herein, Mátyás AU - Haszpra, Tímea AU - Kaszás, Bálint TI - When the Earth goes white: the Snowball Earth attractor T2 - EMS Annual Meeting Abstracts PY - 2022 SP - 1 EP - 1 PG - 1 UR - https://m2.mtmt.hu/api/publication/33112956 ID - 33112956 AB - EMS2022-394 LA - English DB - MTMT ER - TY - JOUR AU - Jánosi, Imre Miklós AU - Kantz, Holger AU - Gallas, Jason A. C. AU - Vincze, Miklós TI - Global coarse-grained mesoscale eddy statistics based on integrated kinetic energy and enstrophy correlations JF - OCEAN SCIENCE J2 - OCEAN SCI VL - 18 PY - 2022 IS - 5 SP - 1361 EP - 1375 PG - 15 SN - 1812-0784 DO - 10.5194/os-18-1361-2022 UR - https://m2.mtmt.hu/api/publication/33110609 ID - 33110609 N1 - „A publikáció a Nemzeti Közszolgálati Egyetem 2020. évi Tématerületi Kiválóság Program keretében, a Fenntartható biztonság és társadalmi környezet elnevezésű projekt támogatásával valósult meg, az Innovációs és Technológiai Minisztérium Nemzeti Kutatási, Fejlesztési és Innovációs Alapból nyújtott támogatásával, a Nemzeti Kutatási, Fejlesztési és Innovációs Hivatal által kibocsátott támogatói okirat alapján.” Pályázat sorszáma: NKFIH-1273-6/2020 Támogató: NKFIH AB - Recently, introduced the concept of a "vortex proxy" based on an observation of strong correlations between integrated kinetic energy and integrated enstrophy over a large enough surface area. When mesoscale vortices are assumed to exhibit a Gaussian shape, the two spatial integrals have particularly simple functional forms, and a ratio of them defines an effective radius of a "proxy vortex". In the original work, the idea was tested over a restricted area in the Californian Current System. Here we extend the analysis to global scale by means of 25 years of AVISO altimetry data covering the (ice-free) global ocean. The results are compared with a global vortex database containing over 64 million mesoscale eddies. We demonstrate that the proxy vortex representation of surface flow fields also works globally and provides a quick and reliable way to obtain coarse-grained vortex statistics. Estimated mean eddy sizes (effective radii) are extracted in very good agreement with the data from the vortex census. Recorded eddy amplitudes are directly used to infer the kinetic energy transported by the mesoscale vortices. The ratio of total and eddy kinetic energies is somewhat higher than found in previous studies. The characteristic westward drift velocities are evaluated by a time-lagged cross-correlation analysis of the kinetic energy fields. While zonal mean drift speeds are in good agreement with vortex trajectory evaluation in the latitude bands 30-5 degrees S and 5-30 degrees N, discrepancies are exhibited mostly at higher latitudes on both hemispheres. A plausible reason for somewhat different drift velocities obtained by eddy tracking and cross-correlation analysis is the fact that the drift of mesoscale eddies is only one component of the surface flow fields. Rossby wave activities, coherent currents, and other propagating features on the ocean surface apparently contribute to the zonal transport of kinetic energy. LA - English DB - MTMT ER - TY - JOUR AU - Harlander, Uwe AU - Borcia, Ion Dan AU - Vincze, Miklós AU - Rodda, Costanza TI - Probability Distribution of Extreme Events in a Baroclinic Wave Laboratory Experiment JF - FLUIDS J2 - FLUIDS VL - 7 PY - 2022 IS - 8 SN - 2311-5521 DO - 10.3390/fluids7080274 UR - https://m2.mtmt.hu/api/publication/33066218 ID - 33066218 N1 - Funding Agency and Grant Number: DFG [HA 2932/8-1, HA 2932/8-2, DFG-FOR1898]; National Research, Development and Innovation Office (NKFIH) of Hungary [FK125024]; DFG Transport and Mixing Project [HA 2932/17-4, BE 1300/25-4] Funding text: This research was funded by the DFG Spontaneous Imbalance Project (HA 2932/8-1 and HA 2932/8-2) that is part of the research group on Multiscale Dynamics of Gravity Waves (DFG- FOR1898). The work of M.V. was supported by the National Research, Development and Innovation Office (NKFIH) of Hungary under grant FK125024. The APC was funded by the DFG Transport and Mixing Project (HA 2932/17-4, BE 1300/25-4). AB - Atmospheric westerly jet streams are driven by temperature differences between low and high latitudes and the rotation of the Earth. Meandering jet streams and propagating Rossby waves are responsible for the variable weather in the mid-latitudes. Moreover, extreme weather events such as heat waves and cold spells are part of the jet stream dynamics. For many years, a simple analog in the form of a simplified laboratory experiment, the differentially heated rotating annulus, has provided insight into the dynamics of the meandering jet stream. In the present study, probability density distributions of extreme events from a long-term laboratory experiment are studied and compared to the atmospheric probability density distributions. Empirical distributions of extreme value monthly block data are derived for the experimental and atmospheric cases. Generalized extreme value distributions are adjusted to the empirical distributions, and the distribution parameters are compared. Good agreement was found, but the distributions of the experimental data showed a shift toward larger extreme values, and some explanations for this shift are suggested. The results indicate that the laboratory model might be a useful tool for investigating changes in extreme event distributions due to climate change. In the laboratory context, the change can be modeled by an increase in total temperature accompanied by a reduction in the radial heat contrast. LA - English DB - MTMT ER - TY - JOUR AU - Takács, Péter AU - Száz, Dénes AU - Vincze, Miklós AU - Slíz, Judit AU - Horváth, Gábor TI - Sunlit zebra stripes may confuse the thermal perception of blood vessels causing the visual unattractiveness of zebras to horseflies. JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 12 PY - 2022 IS - 1 PG - 14 SN - 2045-2322 DO - 10.1038/s41598-022-14619-7 UR - https://m2.mtmt.hu/api/publication/33039461 ID - 33039461 N1 - Open Access: https://www.nature.com/articles/s41598-022-14619-7 LA - English DB - MTMT ER - TY - JOUR AU - Jánosi, Dániel AU - Tél, Tamás TI - Characterizing chaos in systems subjected to parameter drift JF - PHYSICAL REVIEW E: COVERING STATISTICAL NONLINEAR BIOLOGICAL AND SOFT MATTER PHYSICS (2016-) J2 - PHYSICAL REVIEW E VL - 105 PY - 2022 IS - 6 SN - 2470-0045 DO - 10.1103/PhysRevE.105.L062202 UR - https://m2.mtmt.hu/api/publication/32896402 ID - 32896402 N1 - Cited By :2 Export Date: 27 February 2024 LA - English DB - MTMT ER - TY - JOUR AU - Tóth, Ábel Levente AU - Tél, Tamás TI - A lépcsõn pattogó labda projekt. A káosz nyomában TS - A káosz nyomában JF - FIZIKAI SZEMLE J2 - FIZIKAI SZEMLE VL - 72 PY - 2022 IS - 4 SP - 105 EP - 110 PG - 6 SN - 0015-3257 UR - https://m2.mtmt.hu/api/publication/32833105 ID - 32833105 N1 - A kutatást az NFKIH K-125171 pályázat támogatta. LA - Hungarian DB - MTMT ER - TY - JOUR AU - Omel'chenko, Oleh E. AU - Tél, Tamás TI - Focusing on transient chaos JF - JOURNAL OF PHYSICS - COMPLEXITY J2 - J PHYS COMPLEX VL - 3 PY - 2022 IS - 1 PG - 4 SN - 2632-072X DO - 10.1088/2632-072X/ac5566 UR - https://m2.mtmt.hu/api/publication/32749337 ID - 32749337 N1 - Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24/25, Potsdam, 14476, Germany Institute for Theoretical Physics, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest, H-1117, Hungary MTA-ELTE Theoretical Physics Research Group, Pázmány Péter sétány 1/A, Budapest, H-1117, Hungary Cited By :3 Export Date: 10 May 2023 Correspondence Address: Omel'chenko, O.E.; Institute of Physics and Astronomy, Karl-Liebknecht-Str. 24/25, Germany; email: omelchenko@uni-potsdam.de AB - Recent advances in the field of complex, transiently chaotic dynamics are reviewed, based on the results published in the focus issue of J. Phys. Complex. on this topic. One group of achievements concerns network dynamics where transient features are intimately related to the degree and stability of synchronization, as well as to the network topology. A plethora of various applications of transient chaos are described, ranging from the collective motion of active particles, through the operation of power grids, cardiac arrhythmias, and magnetohydrodynamical dynamos, to the use of machine learning to predict time evolutions. Nontraditional forms of transient chaos are also explored, such as the temporal change of the chaoticity in the transients (called doubly transient chaos), as well as transients in systems subjected to parameter drift, the paradigm of which is climate change. LA - English DB - MTMT ER - TY - JOUR AU - Borsányi, Szabolcs AU - Fodor, Zoltán AU - Giordano, Matteo AU - Katz, Sándor AU - Nógrádi, Dániel AU - Pásztor, Attila AU - Him Wong, Chik TI - Lattice simulations of the QCD chiral transition at real baryon density JF - PHYSICAL REVIEW D J2 - PHYS REV D VL - 105 PY - 2022 IS - 5 PG - 8 SN - 2470-0010 DO - 10.1103/PhysRevD.105.L051506 UR - https://m2.mtmt.hu/api/publication/32163877 ID - 32163877 N1 - Funding Agency and Grant Number: BMBF [05P18PXFCA]; Hungarian National Research, Development and Innovation Office, NKFIH [KKP126769]; J. Bolyai Research Scholarship of the Hungarian Academy of Sciences; New National Excellence Program of the Ministry for Innovation and Technology [UNKP-20-5]; Gauss Centre for Supercomputing e.V. Funding text: We thank Tamas G. Kovacs for useful discussions. The project was supported by the BMBF Grant No. 05P18PXFCA. This work was also supported by the Hungarian National Research, Development and Innovation Office, NKFIH Grant No. KKP126769. A. P. is supported by the J. Bolyai Research Scholarship of the Hungarian Academy of Sciences and by the UNKP-20-5 New National Excellence Program of the Ministry for Innovation and Technology. The authors gratefully acknowledge the Gauss Centre for Supercomputing e.V. (www.gauss-centre.eu) for funding this project by providing computing time on the GCS Supercomputers JUWELS/Booster and JURECA/Booster at FZ-Juelich. LA - English DB - MTMT ER -