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On the History of the Lennard-Jones Potential 伦纳德-琼斯电位的历史
IF 2.4 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-05-16 DOI: 10.1002/andp.202400115
Johannes Lenhard, Simon Stephan, Hans Hasse
{"title":"On the History of the Lennard-Jones Potential","authors":"Johannes Lenhard,&nbsp;Simon Stephan,&nbsp;Hans Hasse","doi":"10.1002/andp.202400115","DOIUrl":"10.1002/andp.202400115","url":null,"abstract":"<p>This contribution describes two episodes from the history of the Lennard-Jones (LJ) potential. The first, located in the 1920s and 1930s, is about a computational approach that aimed at pragmatics rather than truth and that remained remarkably robust when quantum theory arrived. The second episode covers the birth of the LJ substance in 1964. Due to increasing interest in computer methods, simulated model substances became objects on their own, the prime targets of investigation. The history of the LJ potential and substance exemplifies the dynamic relationship between prediction, theory, mathematization, and computer instrumentation.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202400115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140968236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Masthead: Ann. Phys. 5/2024 刊头Ann.5/2024
IF 2.4 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-05-12 DOI: 10.1002/andp.202470012
{"title":"Masthead: Ann. Phys. 5/2024","authors":"","doi":"10.1002/andp.202470012","DOIUrl":"https://doi.org/10.1002/andp.202470012","url":null,"abstract":"","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 5","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202470012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140914794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
(Ann. Phys. 5/2024) (Ann. Phys. 5/2024)
IF 2.4 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-05-12 DOI: 10.1002/andp.202470011
{"title":"(Ann. Phys. 5/2024)","authors":"","doi":"10.1002/andp.202470011","DOIUrl":"https://doi.org/10.1002/andp.202470011","url":null,"abstract":"<p><b>Diffusion Model for Relativistic Heavy-Ion Collisions</b></p><p>Relativistic heavy-ion collisions are a versatile tool to study the partial approach of a quantum many-body system towards statistical equilibrium. In article number 2300307, Johannes Hölck and Georg Wolschin present an explicit and rigorous derivation of the stochastic Fokker–Planck equation for the momentum distribution function of produced charged hadrons in longitudinal and transverse rapidities, thus placing the relativistic diffusion model on a firm statistical foundation. The model is used to analyse Pb–Pb collisions at energies reached at the Large Hadron Collider LHC. Detailed comparisons with data from the ATLAS and ALICE collaborations in transverse-momentum and pseudorapidity space are given.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 5","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202470011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140914793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback 利用量子相干反馈改善双腔光机系统中的冷却和纠缠性能
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-05-09 DOI: 10.1002/andp.202400036
Yuan Chen, Ai-Xi Chen
{"title":"Improving the Performance of Cooling and Entanglement in a Double Cavity Optomechanical System Assisted by the Quantum Coherent Feedback","authors":"Yuan Chen,&nbsp;Ai-Xi Chen","doi":"10.1002/andp.202400036","DOIUrl":"10.1002/andp.202400036","url":null,"abstract":"<p>A theoretical scheme is proposed for improving the performance of cooling and entanglement, where the physical model is based on a double cavity optomechanical system assisted by the field-mediated coherent feedback. The cooling performance is evaluated by calculating the final mean phonon number. The steady-state bipartite entanglement between the optical mode and mechanical mode is measured by the logarithmic negativity. The result manifests that with assistance of the quantum coherent feedback, the mechanical resonator (MR) can be cooled close to its quantum ground state and the steady-state optomechanical entanglement is simultaneously created, all of which are obtained under the condition beyond the resolved sideband. The presented feedback strategy is measurement-independent, which can effectively preserve the quantum coherence of system. The scheme is conducive to relaxing the current experimental condition and it may provide a new path for the optomechanical manipulation involving the low-frequency MR.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140934082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analytic Continuation of Multipoint Correlation Functions 多点相关函数的解析续集
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-05-01 DOI: 10.1002/andp.202300504
Anxiang Ge, Johannes Halbinger, Seung-Sup B. Lee, Jan von Delft, Fabian B. Kugler
{"title":"Analytic Continuation of Multipoint Correlation Functions","authors":"Anxiang Ge,&nbsp;Johannes Halbinger,&nbsp;Seung-Sup B. Lee,&nbsp;Jan von Delft,&nbsp;Fabian B. Kugler","doi":"10.1002/andp.202300504","DOIUrl":"10.1002/andp.202300504","url":null,"abstract":"<p>Conceptually, the Matsubara formalism (MF), using imaginary frequencies, and the Keldysh formalism (KF), formulated in real frequencies, give equivalent results for systems in thermal equilibrium. The MF has less complexity and is thus more convenient than the KF. However, computing dynamical observables in the MF requires the analytic continuation from imaginary to real frequencies. The analytic continuation is well-known for two-point correlation functions (having one frequency argument), but, for multipoint correlators, a straightforward recipe for deducing all Keldysh components from the MF correlator had not been formulated yet. Recently, a representation of MF and KF correlators in terms of formalism-independent partial spectral functions and formalism-specific kernels was introduced by Kugler, Lee, and von Delft [Phys. Rev. X 11, 041006 (2021)]. This representation is used to formally elucidate the connection between both formalisms. How a multipoint MF correlator can be analytically continued to recover all partial spectral functions and yield all Keldysh components of its KF counterpart is shown. The procedure is illustrated for various correlators of the Hubbard atom.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140838892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Antimatter Gravity and the Results of the ALPHA-g Experiment 反物质引力与 ALPHA-g 实验结果
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-04-18 DOI: 10.1002/andp.202300519
Massimo Villata
{"title":"Antimatter Gravity and the Results of the ALPHA-g Experiment","authors":"Massimo Villata","doi":"10.1002/andp.202300519","DOIUrl":"10.1002/andp.202300519","url":null,"abstract":"<p>By combining general relativity and CPT symmetry, the theory of CPT gravity predicts gravitational repulsion between matter and CPT-transformed matter, i.e., antimatter inhabiting an inverted space-time. Such repulsive gravity turned out to be an excellent candidate for explaining the accelerated expansion of the Universe, without the need for dark energy. The recent results of the ALPHA-g experiment, which show gravitational attraction between antihydrogen atoms and the Earth, seem to undermine this success in the cosmological field. Analyzing the above theory, two solutions are found that can be consistent with the experimental results, while preserving the large-scale gravitational repulsion. The first highlights how repulsive gravity can be the result of the interaction with an inverted space-time, but occupied by matter and not antimatter, and therefore the antimatter present in our space-time has no reason to exhibit gravitational repulsion. The second retains the original CPT transformation, resulting in repulsive gravity between matter and antimatter, but with the caveat that antimatter immersed in our space-time cannot exhibit the PT transformation which is the cause of the repulsion. Finally, it is shown that, in a Newtonian approximation of the geodesic equation, time reversal is not a necessary operation for repulsive gravity, therefore opening the possibility of an expanding cosmos with a single time direction.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300519","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140628594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Attention to Entropic Communication 关注实体交流
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-04-17 DOI: 10.1002/andp.202300334
Torsten Enßlin, Carolin Weidinger, Philipp Frank
{"title":"Attention to Entropic Communication","authors":"Torsten Enßlin,&nbsp;Carolin Weidinger,&nbsp;Philipp Frank","doi":"10.1002/andp.202300334","DOIUrl":"10.1002/andp.202300334","url":null,"abstract":"<p>The concept of attention has proven to be very relevant in artificial intelligence. Relative entropy (RE, aka Kullback-Leibler divergence) plays a central role in communication theory. Here, these concepts, attention, and RE are combined. RE guides optimal encoding of messages in bandwidth-limited communication as well as optimal message decoding via the maximum entropy principle. In the coding scenario, RE can be derived from four requirements, namely being analytical, local, proper, and calibrated. Weighted RE, used for attention steering in communications, turns out to be improper. To see how proper attention communication can emerge, a scenario of a message sender who wants to ensure that the receiver of the message can perform well-informed actions is analyzed. In case only the curvature of the utility function maxima are known, it becomes desirable to accurately communicate an attention function, in this case a by this curvature weighted and re-normalized probability function. Entropic attention communication is here proposed as the desired generalization of entropic communication that permits weighting while being proper, thereby aiding the design of optimal communication protocols in technical applications and helping to understand human communication. It provides the level of cooperation expected under misaligned interests of otherwise honest communication partners.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300334","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optomechanical Coupling Optimization in Engineered Nanocavities 工程纳米腔中的光机耦合优化
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-04-17 DOI: 10.1002/andp.202300417
S. Edelstein, J. Gomis-Bresco, G. Arregui, P. Koval, N. D. Lanzillotti-Kimura, D. Torrent, C. M. Sotomayor-Torres, P. D. García
{"title":"Optomechanical Coupling Optimization in Engineered Nanocavities","authors":"S. Edelstein,&nbsp;J. Gomis-Bresco,&nbsp;G. Arregui,&nbsp;P. Koval,&nbsp;N. D. Lanzillotti-Kimura,&nbsp;D. Torrent,&nbsp;C. M. Sotomayor-Torres,&nbsp;P. D. García","doi":"10.1002/andp.202300417","DOIUrl":"10.1002/andp.202300417","url":null,"abstract":"<p>In optomechanics, the interaction between light and matter is enhanced by engineering cavities where the electromagnetic field and the mechanical displacement are confined simultaneously within the same volume. This leads to a wide range of interesting phenomena, such as optomechanically induced transparency and the cooling of macroscopic objects to their lowest possible motion state. In this manuscript, the focus is on designed optomechanical cavities exploiting heterostructures in air-slot photonic-crystal waveguides, incorporating different hole shapes and dimensions to engineer and control their optomechanical properties. The aim is to maximize the optical quality factor of the optical cavity, while ensuring optical mode volumes below the diffraction limit. These optimized optical modes interact with in-plane motional degrees of freedom of the structures achieving high optomechanical coupling rates, thus opening up the possibility of mechanical amplification, nonlinear dynamics and chaos through the optomechanical back-action.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202300417","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electron Odd-Pearcey Gaussian Beams Propagating In a Constant Magnetic Field 在恒定磁场中传播的电子奇异高斯光束
IF 2.2 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-04-16 DOI: 10.1002/andp.202300529
Xuezhen Cai, Huilin Tang, Haoyu Huang, Hailong Wu, Xingyi He, Yanru Chen, Dongmei Deng
{"title":"Electron Odd-Pearcey Gaussian Beams Propagating In a Constant Magnetic Field","authors":"Xuezhen Cai,&nbsp;Huilin Tang,&nbsp;Haoyu Huang,&nbsp;Hailong Wu,&nbsp;Xingyi He,&nbsp;Yanru Chen,&nbsp;Dongmei Deng","doi":"10.1002/andp.202300529","DOIUrl":"10.1002/andp.202300529","url":null,"abstract":"<p>In this paper, the introduction of a novel type of electron beams known as electron odd-Pearcey Gaussian beams (EOPGBs) is presented. For the first time, the dynamics of EOPGBs are explored propagating in both free space and a constant magnetic field by employing the Schrödinger equation. The investigation reveals that the electron beams exhibit remarkable auto-focusing characteristics in these two media, and the focal length can be controlled by adjusting certain parameters. Additionally, in a constant magnetic field, EOPGBs exhibit intriguing properties, notably the dual auto-focusing property, which sets them apart from other known electron beams. The probability currents and distribution factors are used to provide a theoretical explanation for the aforementioned features of EOPGBs. Furthermore, the conclusions are consistent with the results obtained from numerical simulations.</p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 7","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140614344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
(Ann. Phys. 4/2024) (Ann. Phys. 4/2024)
IF 2.4 4区 物理与天体物理
Annalen der Physik Pub Date : 2024-04-08 DOI: 10.1002/andp.202470009
{"title":"(Ann. Phys. 4/2024)","authors":"","doi":"10.1002/andp.202470009","DOIUrl":"https://doi.org/10.1002/andp.202470009","url":null,"abstract":"<p><b>Brownian Motion</b></p><p>The statistics of the position of an optically-trapped colloid immersed in a bacterial bath is prominently non-Gaussian. Costantino Di Bello, Rita Majumdar, Édgar Roldán, and coworkers (article number 2300427) develop an exactly-solvable theory for the fluctuations of a colloid in a diluted bacterial bath and explore its thermodynamic consequences. Fruits of their theory, they establish how can experimentalists infer the statistics of the forces exerted by the bacteria (often unaccessible experimentally) from the non-Gaussian features of the statistics of the colloid's position.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":7896,"journal":{"name":"Annalen der Physik","volume":"536 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/andp.202470009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140537892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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