Pramana最新文献 - Book学术

Constraining SMEFT BSM scenarios with EWPO and (Delta _{textrm{CKM}}) 使用EWPO和约束SMEFT BSM场景 (Delta _{textrm{CKM}})

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-10-11 DOI: 10.1007/s12043-025-02990-9

Mathew Thomas Arun, Kuldeep Deka, Tripurari Srivastava

{"title":"Constraining SMEFT BSM scenarios with EWPO and (Delta _{textrm{CKM}})","authors":"Mathew Thomas Arun, Kuldeep Deka, Tripurari Srivastava","doi":"10.1007/s12043-025-02990-9","DOIUrl":"10.1007/s12043-025-02990-9","url":null,"abstract":"<div>Precision observables are well known for constraining most of the beyond standard model (BSM) scenarios tightly, among which the electroweak precision observables (EWPO) play a significant role. Recent measurement of the W boson mass ((M_W)) at CDF-II has put a renewed focus on the EWPO and its ensuing constraints. In this study, we look at the scenarios where these BSM effects are encoded primarily in ten dimension-6 standard model effective field theory (SMEFT) operators (in the Warsaw basis) which contribute to the EWPO at tree-level. After presenting the fitting procedure and testing it on the S, T and V parameters, we go on to fit various BSM scenarios consisting of different well-motivated subsets of the 10 operators of our interest. To constrain these scenarios further, we augment the EWPO with (Delta _{textrm{CKM}}) measurement using 1-loop matching of the low-energy effective field theory to SMEFT operators at the Z-pole. We show that the inclusion of the (Delta _{textrm{CKM}}) constraint indeed results in stronger bounds on our Wilson coefficients. One of our operator subsets caters to the models of vector-like leptons, where we find out that such a minimal extension is in tension with the forward–backward asymmetry in the b-sector ((A_b^{textrm{FB}})) and (M_W). Finally, we also include the LEP-II observables pertaining to the WW production, thereby lifting the two associated blind directions, helping us present the results for the full fit.\u0000</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256788","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

Geodesic motion and circular motion of particles around charged black hole immersed in non-linear Maxwell ( f(R) ) gravity 沉浸在非线性麦克斯韦引力中的带电黑洞周围粒子的测地线运动和圆周运动( f(R) )

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-12 DOI: 10.1007/s12043-025-02966-9

Indrajit Halder

{"title":"Geodesic motion and circular motion of particles around charged black hole immersed in non-linear Maxwell ( f(R) ) gravity","authors":"Indrajit Halder","doi":"10.1007/s12043-025-02966-9","DOIUrl":"10.1007/s12043-025-02966-9","url":null,"abstract":"<div>This paper investigates the geodesic motion and circular motion of particles around a linear Maxwell (f(R)) black hole in a modified gravity black hole field, using a specific metric. It focusses on framing the effective potential function for photon-like as well as massive particles, revealing differences in the behaviour of coordinate and proper time relative to radial distance in the space–time geometry. The analysis focusses on effective potential curves obtained from specific equations, examining the dynamics of massless and massive particles in different scenarios. Moreover, it examines the stability of particle orbits using the Lyapunov exponent and explains how the circular orbit of a particle moving under the influence of gravitational field of the black hole is conditionally stabilised. This paper examines how the cosmological constant and gravitational modification parameter influence the circular and geodesic motion of the particle. Finally, this paper provides a graphical analysis of the radius of the innermost stable circular orbit and outermost stable circular orbit of the particles moving in the field of modified gravity.\u0000</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037292","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

Modified Legendre wavelet-based comparative study of a new model of romantic and interpersonal relationships 基于改进勒让德小波的浪漫与人际关系新模型的比较研究

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-08 DOI: 10.1007/s12043-025-02994-5

R Yeshwanth, S Kumbinarasaiah

{"title":"Modified Legendre wavelet-based comparative study of a new model of romantic and interpersonal relationships","authors":"R Yeshwanth, S Kumbinarasaiah","doi":"10.1007/s12043-025-02994-5","DOIUrl":"10.1007/s12043-025-02994-5","url":null,"abstract":"<div>Current biosocial theories, such as the influence of neurotransmitters on the behaviour, ecological perspectives that consider cultural, political, and institutional factors and interpersonal views like attachment, have shaped our understanding of romantic and interpersonal relationships as typical social experiences. However, these theories fail to offer a comprehensive framework for the relationship dynamics and a fully integrated theoretical approach is still missing. Here, we have developed a mathematical model to investigate the dynamics of romantic and interpersonal relationships between male, female, child and society via a system of fractional differential equations (SFDEs) to provide insight into the love/hate behaviour. The model comprises four classes describing the love/hate of males, females, children and society. The modified operational matrix of integration (OMI) of the Legendre wavelets is presented and used to solve the SFDEs. The model is solved using RK4, NDSolve and the Legendre wavelet collocation method (LWCM) for numerical analysis and comparison of the solutions. Numerical and graphical study of fractional order is done for different values of (gamma ). The pictorial analysis of various values of parameters to show the variation of classes is done. The Mathematica software has been used for numerical computations. This study reveals how the internal relationship and status affect the status of the society.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 4","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145007824","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

Feedback-driven model of dynamic information spreading in online social networks 在线社交网络中动态信息传播的反馈驱动模型

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-06 DOI: 10.1007/s12043-025-02999-0

Fuzhong Nian, Jingru Niu, Zhen Wang

引用次数: 0

The travelling wave solutions to stochastic resonant nonlinear Schrödinger equation with both spatio-temporal and inter-modal dispersions having multiplicative white noise 具有乘性白噪声的时空和模态间色散随机共振非线性Schrödinger方程的行波解

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-02 DOI: 10.1007/s12043-025-02992-7

Na Tang, Bing-Wen Zhang

引用次数: 0

Stability of the Toda system related to a perturbed (R_I)-type recurrence relation 与摄动(R_I)型递推关系相关的Toda系统的稳定性

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-02 DOI: 10.1007/s12043-025-02988-3

Vinay Shukla, A Swaminathan

引用次数: 0

(beta )-decay properties of proton-rich Sn isotopes (beta )-富质子锡同位素的衰变性质

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-09-02 DOI: 10.1007/s12043-025-03001-7

Jameel-Un Nabi, Wajeeha Khalid, M Aswad Ali Shah

{"title":"(beta )-decay properties of proton-rich Sn isotopes","authors":"Jameel-Un Nabi, Wajeeha Khalid, M Aswad Ali Shah","doi":"10.1007/s12043-025-03001-7","DOIUrl":"10.1007/s12043-025-03001-7","url":null,"abstract":"<div>We explore the (beta )-decay features of the doubly magic nucleus (^{100})Sn and proton-rich Sn isotopes within the mass range 100(le ) A (le ) 110. Our calculations yield a Gamow–Teller (GT) strength of 4.157 for the transition from the ground state to the lowest excited state of (^{100})Sn, which closely aligns with the recently measured value of 4.381 at RIKEN. The GT strength distributions computed for (^{102-104, 106, 108})Sn exhibit good agreement with experimental observations. Additionally, we compare our GT data with previous theoretical calculations. The predicted half-lives are reproduced within a factor of 2 relative to the experimental values for (^{100-110})Sn. For the first time, we present microscopic calculations of electron capture, (beta ^{+}) decay, and proton emission rates for proton-rich Sn isotopes under stellar conditions. As the core density of a star reaches (10^{11}) g/cm(^3), electron capture rates calculated by up to seven orders of magnitude. In contrast, (beta ^{+}) decay rates remain largely unchanged with variations in core density but exhibit changes of up to three orders of magnitude with increasing core temperatures. A decreasing trend in stellar rates is observed with increasing neutron number N, specifically for even-even and odd-A Sn isotopes. The reported stellar rates provide valuable insights for the rp-process and simulation of post-silicon evolution of massive stars.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144926911","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

Spherically symmetric vacuum solutions of modified field equations in (f(R, Sigma , T))-gravity (f(R, Sigma , T)) -重力中修正场方程的球对称真空解

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-08-31 DOI: 10.1007/s12043-025-02996-3

M Khater, M A Bakry

引用次数: 0

A comparative study on antimicrobial efficacy of non-metallic S, SiO2 and S@SiO2 core–shell nanoparticles 非金属S、SiO2和S@SiO2核壳纳米颗粒抗菌效果的比较研究

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-08-31 DOI: 10.1007/s12043-025-02972-x

Divyansha Singh, Deepika P Joshi, Pankaj Singh Rawat

{"title":"A comparative study on antimicrobial efficacy of non-metallic S, SiO2 and S@SiO2 core–shell nanoparticles","authors":"Divyansha Singh, Deepika P Joshi, Pankaj Singh Rawat","doi":"10.1007/s12043-025-02972-x","DOIUrl":"10.1007/s12043-025-02972-x","url":null,"abstract":"<div>The present work aims to investigate the antimicrobial efficacy of non-metallic sulphur, silica and S@SiO2 core–shell nanoparticles. The X-ray diffraction (XRD) pattern confirmed that the silica nanoparticles have an amorphous structure. In contrast, the sulphur nanoparticles have a crystalline nature with an orthorhombic α-phase structure and S@SiO2 nanoparticles suggest the superposition of silica XRD pattern on that of sulphur. UV–Visible spectra of silica, sulphur and S@SiO2 show the highest absorption peak at 293, 326 and 305 nm, respectively. Fourier-transform infrared spectroscopy (FTIR) spectra of core–shell NPs show the presence of sulphur and silica in the core–shell nanoparticles without any chemical interaction between them. The field-emission scanning electron microscopy (FE-SEM) images revealed that the silica nanoparticles are of uniform spherical shape and the average particle size is approximately 250 nm. The shape of the sulphur nanoparticles was found to be irregular and the average particle size was found to be around 130 nm. The FE-SEM images of the core–shell nanoparticles confirmed the regular spherical shape of S@SiO2 core–shell nanoparticles with an average particle size of approximately 350 nm. The antimicrobial properties of all the synthesised nanoparticles were examined against animal pathogenic gram-negative bacteria, Escherichia coli, Salmonella and plant pathogenic gram-negative bacteria such as Erwinia amylovora, Xanthomonas oryzae by using agar disk diffusion method. The result shows that uncoated and coated nanoparticles substantially inhibit all the gram-negative bacteria. The results demonstrate that the silica and sulphur nanoparticles show effective antimicrobial efficacy against all the specified bacteria, with concentrations of 1500 and 2000 µg(/)ml being the most effective.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920482","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

Numerical analysis of the micropolar fluid flow over a permeable stretching sheet with magnetic field effects 磁场作用下可渗透拉伸片上微极流体流动的数值分析

IF 2.1 4区物理与天体物理

Pramana Pub Date : 2025-08-31 DOI: 10.1007/s12043-025-02978-5

Bandita Das, Sunmoni Mudoi, Chinmoy Dutta, Pranjal Saikia

{"title":"Numerical analysis of the micropolar fluid flow over a permeable stretching sheet with magnetic field effects","authors":"Bandita Das, Sunmoni Mudoi, Chinmoy Dutta, Pranjal Saikia","doi":"10.1007/s12043-025-02978-5","DOIUrl":"10.1007/s12043-025-02978-5","url":null,"abstract":"<div>This study explores the effects of MHD and slip velocity on micropolar fluid flow, heat transfer and mass transport over a stretching sheet with heat generation. The impacts of heat generation, thermal conductivity, heat flux, micro-rotation, Prandtl number and Schmidt number were investigated analytically. Similarity transformation is applied to convert the governing partial differential equations into a system of nonlinear ordinary differential equations, which are then solved numerically using the bvp4c method. Graphics are used to illustrate the impact of the relevant parameter on the distribution of velocity, micro-rotation, temperature and concentration. Validation of the solutions is done for some specific cases. Additionally, the consequences of several parameters on the skin friction caused by the primary velocity, Nusselt number and Sherwood number are shown in tabular form. A thorough description and summary of the numerical results for key flow parameters, including the local skin-friction coefficient, wall couple stress and local Nusselt number, are presented in tables. Microparticles have a significant effect on the flow phenomenon. The results are interpreted in detail. This research relates to enhancing electromagnetic fluid management, heat exchangers and industrial processes.</div>","PeriodicalId":743,"journal":{"name":"Pramana","volume":"99 3","pages":""},"PeriodicalIF":2.1,"publicationDate":"2025-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144920507","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