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Electric Penrose process and collisions of particles near five-dimensional weakly charged Schwarzschild black hole
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-03-02 DOI: 10.1140/epjp/s13360-025-06137-y
Tursunali Xamidov, Mirzabek Alloqulov, Sanjar Shaymatov
{"title":"Electric Penrose process and collisions of particles near five-dimensional weakly charged Schwarzschild black hole","authors":"Tursunali Xamidov,&nbsp;Mirzabek Alloqulov,&nbsp;Sanjar Shaymatov","doi":"10.1140/epjp/s13360-025-06137-y","DOIUrl":"10.1140/epjp/s13360-025-06137-y","url":null,"abstract":"<div><p>The particle dynamics and the electric Penrose process for the five-dimensional weakly charged Schwarzschild black hole are studied. Firstly, the horizon structure and the effective potential for the test particle are explored. The radial profile of the effective potential is plotted for different values of the BH charge. Then, we studied energy efficiency using the conservation laws for energy, angular momentum, and charge of particles. The appropriate plots were obtained and compared with the results for the four-dimensional Schwarzschild BH. Moreover, we obtained the constraints on mass and charge of black hole to accelerate protons of different energies (1-<span>(10^{9})</span> GeV). Finally, collisions of electrically charged particles near the horizon of the five-dimensional Schwarzschild BH are studied. We demonstrated the radial dependence of the center-of-mass energy for different values of the angular momentum and charge of the particles together with the BH charge.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Effects of parameter change on spin reversal in decorated nanoislands
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-03-02 DOI: 10.1140/epjp/s13360-025-06134-1
Sheng Chen, Yanyi Wu, Xin Chang, Baohua Teng
{"title":"Effects of parameter change on spin reversal in decorated nanoislands","authors":"Sheng Chen,&nbsp;Yanyi Wu,&nbsp;Xin Chang,&nbsp;Baohua Teng","doi":"10.1140/epjp/s13360-025-06134-1","DOIUrl":"10.1140/epjp/s13360-025-06134-1","url":null,"abstract":"<div><p>Based on transverse-field Ising model, we investigated the flipping phenomenon of a decorated nanoisland system with spin-1/2 using the decoupling approximation of Fermi-type Green’s function. The results reveal that, under the conditions of relatively weak surface exchange interaction <i>J</i><sub><i>S</i></sub><i>/J</i> and transverse-field <i>Ω/J</i>, the system exhibits spin reversal during the heating process. Decorative exchange interaction <i>J</i><sub><i>D</i></sub><i>/J</i> only affects the details of the phase transition properties, and the temperature at which spin reversal occurs can still be qualitatively analyzed based on the mean-field phase diagram.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Theoretical Analysis on QCD Ghost Dark Energy in the DGP Braneworld
IF 1.2 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-03-02 DOI: 10.1134/S020228932470052X
Sibo Zhang, Weiqiang Yang
{"title":"Theoretical Analysis on QCD Ghost Dark Energy in the DGP Braneworld","authors":"Sibo Zhang,&nbsp;Weiqiang Yang","doi":"10.1134/S020228932470052X","DOIUrl":"10.1134/S020228932470052X","url":null,"abstract":"<p>We study the evolution of a QCD ghost dark energy model under two branches of the DGP braneworld, and this model is distinguished from the <span>(Lambda)</span>CDM model by diagnostic methods of Statefinder hierarchy and Om(<span>(z)</span>). Through the derivation of the evolution equation of the energy density parameters, the deceleration parameters and the equation-of-state (EoS) parameter, it can be proved that in both noninteractive and interactive scenarios (specifically, including <span>(Q_{1}=3Hxirho_{textrm{de}},Q_{2}=3Hxirho_{textrm{dm}},Q_{3}=3Hxi(rho_{textrm{de}}+rho_{textrm{dm}}))</span>), this model can well describe the evolution rule of today’s universe. In the later stage of the evolution of the universe, the main component of the universe changed from dark matter to dark energy, and the universe gradually transitioned from decelerating expansion to accelerating expansion, and it will not end up with a big rip in the future. And in the self-accelerating branch of the DGP braneworld, the accelerated expansion of the universe occurred earlier. In order to distinguish the QCD model from the <span>(Lambda)</span>CDM model, we adopted two diagnostic methods, namely, the Statefinder diagnostic and the Om diagnostic. From their respective diagnostic images, it can be seen that these two diagnostic methods cannot only effectively distinguish the QCD model from <span>(Lambda)</span>CDM, but also directly reflect that the coupling parameters <span>(xi)</span> have a certain impact on the dark energy model. It can also eliminate the degeneracy of different coupling parameters under the same interaction.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 1","pages":"82 - 98"},"PeriodicalIF":1.2,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529927","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
A Theory of Gravity in Minkowski Space
IF 1.2 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-03-02 DOI: 10.1134/S0202289324700506
Naman Kumar
{"title":"A Theory of Gravity in Minkowski Space","authors":"Naman Kumar","doi":"10.1134/S0202289324700506","DOIUrl":"10.1134/S0202289324700506","url":null,"abstract":"<p>We propose a theory of gravity in Minkowski space. The basic idea is that the presence of mass affects the world line of particles in flat Minkowski background. Although General Relativity is in complete agreement with observations so far, the theory discussed in this paper can solve some of the conceptual difficulties of GR, such as the energy problem, that is at the core of constructing this theory. We also discuss the cosmic expansion of the present universe and comment on the early universe. Furthermore, we demonstrate how the flatness problem and horizon problem are solved within this framework. As it will become clear, this is a theory of principle and not a theory of construction.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 1","pages":"64 - 70"},"PeriodicalIF":1.2,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529928","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
Projective Collineation in Space-Times of Pseudo-Symmetric Type
IF 1.2 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-03-02 DOI: 10.1134/S0202289324700452
Uday Chand De, Krishnendu De
{"title":"Projective Collineation in Space-Times of Pseudo-Symmetric Type","authors":"Uday Chand De,&nbsp;Krishnendu De","doi":"10.1134/S0202289324700452","DOIUrl":"10.1134/S0202289324700452","url":null,"abstract":"<p>This article deals with an investigation of projective collineations in pseudo-symmetric type space-times. First we deduce that if a pseudo-Ricci symmetric space-time admits a projective collineation whose associated vector field is a special projective vector field, then the space-time represents a stiff matter fluid. Also, we establish that if a pseudo-projective symmetric space-time admits a projective collineation whose associated vector field is a projective vector field, then the space-time becomes an Einstein space-time. Finally, we illustrate that if a pseudo-projective symmetric space-time admits a non-affine projective vector field, then the space-time becomes a perfect fluid space-time.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 1","pages":"22 - 27"},"PeriodicalIF":1.2,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530029","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
GNINA 1.3: the next increment in molecular docking with deep learning
IF 7.1 2区 化学
Journal of Cheminformatics Pub Date : 2025-03-02 DOI: 10.1186/s13321-025-00973-x
Andrew T. McNutt, Yanjing Li, Rocco Meli, Rishal Aggarwal, David Ryan Koes
{"title":"GNINA 1.3: the next increment in molecular docking with deep learning","authors":"Andrew T. McNutt,&nbsp;Yanjing Li,&nbsp;Rocco Meli,&nbsp;Rishal Aggarwal,&nbsp;David Ryan Koes","doi":"10.1186/s13321-025-00973-x","DOIUrl":"10.1186/s13321-025-00973-x","url":null,"abstract":"<div><p>Computer-aided drug design has the potential to significantly reduce the astronomical costs of drug development, and molecular docking plays a prominent role in this process. Molecular docking is an <i>in silico</i> technique that predicts the bound 3D conformations of two molecules, a necessary step for other structure-based methods. Here, we describe version 1.3 of the open-source molecular docking software <span>Gnina</span>. This release updates the underlying deep learning framework to PyTorch, resulting in more computationally efficient docking and paving the way for seamless integration of other deep learning methods into the docking pipeline. We retrained our CNN scoring functions on the updated CrossDocked2020 v1.3 dataset and introduce knowledge-distilled CNN scoring functions to facilitate high-throughput virtual screening with <span>Gnina</span>. Furthermore, we add functionality for covalent docking, where an atom of the ligand is covalently bound to an atom of the receptor. This update expands the scope of docking with <span>Gnina</span> and further positions <span>Gnina</span> as a user-friendly, open-source molecular docking framework. <span>Gnina</span> is available at https://github.com/gnina/gnina.</p><p><b>Scientific contributions</b>: GNINA 1.3 is an open source a molecular docking tool with enhanced support for covalent docking and updated deep learning models for more effective docking and screening.</p></div>","PeriodicalId":617,"journal":{"name":"Journal of Cheminformatics","volume":"17 1","pages":""},"PeriodicalIF":7.1,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://jcheminf.biomedcentral.com/counter/pdf/10.1186/s13321-025-00973-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
SH wave in two-layered structure of functionally graded viscoelastic and monoclinic media under the influence of an interior point source
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-03-02 DOI: 10.1140/epjp/s13360-025-06086-6
Nirakara Pradhan, Santanu Manna, Sapan Kumar Samal, Shalini Saha
{"title":"SH wave in two-layered structure of functionally graded viscoelastic and monoclinic media under the influence of an interior point source","authors":"Nirakara Pradhan,&nbsp;Santanu Manna,&nbsp;Sapan Kumar Samal,&nbsp;Shalini Saha","doi":"10.1140/epjp/s13360-025-06086-6","DOIUrl":"10.1140/epjp/s13360-025-06086-6","url":null,"abstract":"<div><p>This paper investigates the propagation characteristics of SH-type waves originating from a point source situated at the interface of a unique structure comprising a functionally graded viscoelastic (FGV) layer of finite depth overlying a functionally graded monoclinic (FGM) half-space. The upper viscoelastic layer exhibits a hyperbolic gradient property in its material constants, while an exponential gradient property characterizes the lower monoclinic half-space. Employing the Fourier transform and Green’s function method to account for surface and interfacial boundary conditions, a dispersion relation for the SH-type waves is derived. The obtained dispersion relation for the gradient layered structures reveals a complex interplay between wave phenomena and material properties. Numerical analysis is performed to illustrate the theoretical results for various gradient parameter values, demonstrating a significant influence on dispersion curves, phase velocity, group velocity, and wave number. This understanding holds paramount importance for seismic imaging, geological resource exploration, and the design of resilient infrastructure, thereby fostering innovation in geophysics and engineering.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Existence of a Local Classical Solution to the Einstein-Scalar System in Higher Dimensions
IF 1.2 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-03-02 DOI: 10.1134/S0202289324700440
Mirda Prisma Wijayanto, Fiki Taufik Akbar, Bobby Eka Gunara
{"title":"Existence of a Local Classical Solution to the Einstein-Scalar System in Higher Dimensions","authors":"Mirda Prisma Wijayanto,&nbsp;Fiki Taufik Akbar,&nbsp;Bobby Eka Gunara","doi":"10.1134/S0202289324700440","DOIUrl":"10.1134/S0202289324700440","url":null,"abstract":"<p>We study the existence of a local classical solution to the Einstein-Scalar equations in higher dimensions. We reduce the problem to a single first-order integro-differential equation. Then, we employ the contraction mapping in the appropriate Banach space. Using the Banach fixed theorem, we show that there exists a unique fixed point, which is the solution to the main problem. Finally, for given initial data, we prove the existence of a local classical solution.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 1","pages":"13 - 21"},"PeriodicalIF":1.2,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143530028","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
Machine learning analysis of anomalous diffusion 异常扩散的机器学习分析
IF 2.8 3区 物理与天体物理
The European Physical Journal Plus Pub Date : 2025-03-02 DOI: 10.1140/epjp/s13360-025-06138-x
Wenjie Cai, Yi Hu, Xiang Qu, Hui Zhao, Gongyi Wang, Jing Li, Zihan Huang
{"title":"Machine learning analysis of anomalous diffusion","authors":"Wenjie Cai,&nbsp;Yi Hu,&nbsp;Xiang Qu,&nbsp;Hui Zhao,&nbsp;Gongyi Wang,&nbsp;Jing Li,&nbsp;Zihan Huang","doi":"10.1140/epjp/s13360-025-06138-x","DOIUrl":"10.1140/epjp/s13360-025-06138-x","url":null,"abstract":"<div><p>The rapid advancements in machine learning have made its application to anomalous diffusion analysis both essential and inevitable. This review systematically introduces the integration of machine learning techniques for enhanced analysis of anomalous diffusion, focusing on two pivotal aspects: single trajectory characterization via machine learning and representation learning of anomalous diffusion. We extensively compare various machine learning methods, including both classical machine learning and deep learning, used for the inference of diffusion parameters and trajectory segmentation. Additionally, platforms such as the anomalous diffusion challenge that serve as benchmarks for evaluating these methods are highlighted. On the other hand, we outline three primary strategies for representing anomalous diffusion: the combination of predefined features, the feature vector from the penultimate layer of neural network, and the latent representation from the autoencoder, analyzing their applicability across various scenarios. This investigation paves the way for future research, offering valuable perspectives that can further enrich the study of anomalous diffusion and advance the application of artificial intelligence in statistical physics and biophysics.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Cosmological Models Based on an Asymmetric Scalar Higgs Doublet with Potential Interactions between Components
IF 1.2 4区 物理与天体物理
Gravitation and Cosmology Pub Date : 2025-03-02 DOI: 10.1134/S0202289324700439
Yu. G. Ignat’ev, A. R. Samigullina
{"title":"Cosmological Models Based on an Asymmetric Scalar Higgs Doublet with Potential Interactions between Components","authors":"Yu. G. Ignat’ev,&nbsp;A. R. Samigullina","doi":"10.1134/S0202289324700439","DOIUrl":"10.1134/S0202289324700439","url":null,"abstract":"<p>Cosmological models based on an asymmetric scalar Higgs doublet (the canonical <span>(Phi)</span> and phantom <span>(phi)</span> fields) with potential interaction between the components are proposed. A qualitative analysis of the corresponding dynamic systems is performed, and their transformation properties with respect to similarity transformations of fundamental constants are revealed. The asymptotic behavior of this class of cosmological models near cosmological singularities is investigated. Numerical simulations reveal a number of interesting features of these models, in particular, the possibility of a fairly long “waiting phase,” during which the Universe is almost Euclidean, as well as the presence of bounce points, near which there occur strong oscillations of the scalar potentials.</p>","PeriodicalId":583,"journal":{"name":"Gravitation and Cosmology","volume":"31 1","pages":"1 - 12"},"PeriodicalIF":1.2,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529932","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
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