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Steadiness of Stabilized Randall–Sundrum Model with Respect to Quantum Corrections 稳定的兰德尔-桑德鲁姆模型与量子修正的稳定性
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700358
I. P. Volobuev, S. I. Keizerov, E. R. Rakhmetov
{"title":"Steadiness of Stabilized Randall–Sundrum Model with Respect to Quantum Corrections","authors":"I. P. Volobuev,&nbsp;S. I. Keizerov,&nbsp;E. R. Rakhmetov","doi":"10.3103/S0027134924700358","DOIUrl":"10.3103/S0027134924700358","url":null,"abstract":"<p>In the Randall–Sundrum model stabilized with the help of the Goldberger–Wise scalar field, the lowest order vacuum quantum corrections to the energy-momentum tensor of the scalar and tensor fields are considered. It is shown that the corresponding vacuum energy density of the fields in the bulk leads to the Casimir effect. Using the dimensional regularization method and the Abel–Plana formula, the divergences have been isolated and the vacuum energy density has been renormalized. An analytical expression for the Casimir force is obtained and an estimate of its influence on the model parameters is made. It has been found that the quantum corrections lead only to a negligibly small decrease in the distance between the branes, i.e. the model possesses steadiness with respect to quantum corrections.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"156 - 168"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551253","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
Burnt Gas Flow Stability of Limit Flames in Vertical Tubes 垂直管道中极限火焰的燃烧气体流动稳定性
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700218
I. A. Gulyaev, K. A. Kazakov
{"title":"Burnt Gas Flow Stability of Limit Flames in Vertical Tubes","authors":"I. A. Gulyaev,&nbsp;K. A. Kazakov","doi":"10.3103/S0027134924700218","DOIUrl":"10.3103/S0027134924700218","url":null,"abstract":"<p>Stability of gas flows generated by steady near-limit flames propagating in vertical tubes is studied numerically. Basic scenarios of the burnt gas flow evolution are identified in relation to the thermal gas expansion parameter and the normal flame speed. It is shown that the implementation of a specific scenario essentially depends on the stagnation zone width as well as on the distance travelled by the gas from the flame front to the tube end. In particular, it is found that for sufficiently short distances, the burnt gas flows are stable provided that the stagnation zone width is less than half the tube diameter. Otherwise, an unstable flow evolution can lead to the appearance of recirculation domains and acoustic perturbations.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"169 - 177"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551254","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
Fine Structure of Pygmy and Giant Multipole Resonances in Nuclei 核中侏儒和巨人多极共振的精细结构
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700243
S. P. Kamerdzhiev, M. I. Shitov
{"title":"Fine Structure of Pygmy and Giant Multipole Resonances in Nuclei","authors":"S. P. Kamerdzhiev,&nbsp;M. I. Shitov","doi":"10.3103/S0027134924700243","DOIUrl":"10.3103/S0027134924700243","url":null,"abstract":"<p>In connection with the planned work program at the megascience facility ‘‘Intense Inverse Compton’’ (INOC) at the Scientific Center for Physics and Mathematics in Sarov, a brief overview of experimental and theoretical results in the energy range of pygmy and giant resonances is presented. Considered are: (1) the pygmy dipole resonance in <span>({}^{208})</span>Pb, for which the experimental resolution limit has already been reached, and separate <span>(1^{-})</span> levels have been identified; (2) the most important physical results of experiments with resolution 50–200 keV both for the gamma strength functions, which determine characteristics of nuclear reactions, and for the analysis of nonstatistical mechanisms of formation of the widths of giant resonances (‘‘doorway’’ states) within the framework of wavelet analysis. Some results in the energy excitation range 1–5 MeV are also discussed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"191 - 199"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551256","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
Wind Effects on Deep Convection in Lake Baikal during the Autumnal Thermal Bar 风对贝加尔湖秋季热压带深层对流的影响
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700280
B. O. Tsydenov, N. S. Trunov, V. V. Churuksaeva, D. V. Degi
{"title":"Wind Effects on Deep Convection in Lake Baikal during the Autumnal Thermal Bar","authors":"B. O. Tsydenov,&nbsp;N. S. Trunov,&nbsp;V. V. Churuksaeva,&nbsp;D. V. Degi","doi":"10.3103/S0027134924700280","DOIUrl":"10.3103/S0027134924700280","url":null,"abstract":"<p>The results of numerical modelling of deep convection processes in Lake Baikal during the autumnal thermal bar are presented. Using the Boldakov River—the Maloye More Strait cross-section, characterized by great depths, as an example, an analysis of the space–time temperature distributions under various wind conditions was conducted. Simulations have shown the effectiveness of wind only in the upper 250-meter layer. However, the cabbeling instability generated by the thermal bar can lead to convective mixing down to depths of <span>({sim}600)</span> m.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"283 - 290"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551248","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
Evolution of a Two-Dimensional Moving Contrast Structure in an Inhomogeneous Medium with Advection 非均质介质中带有平流的二维移动对比结构的演变
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700279
A. A. Bykov
{"title":"Evolution of a Two-Dimensional Moving Contrast Structure in an Inhomogeneous Medium with Advection","authors":"A. A. Bykov","doi":"10.3103/S0027134924700279","DOIUrl":"10.3103/S0027134924700279","url":null,"abstract":"<p>We consider the problem of evolution of the internal transition layer for two-dimensional quasilinear initial-boundary value problem for the reaction-advection-diffusion equation in an inhomogeneous medium with a small parameter for higher derivatives. It is shown that in the zero (principal) order of the asymptotic series, the position of the internal transition layer is described by the Hamilton–Jacobi equation. The potential is calculated as an integral of the source density function within the limits of the equilibrium levels. The front line of the transition layer evolves in the same way as the constant-eikonal line (or wavefront line) for the problem of wave propagation in an inhomogeneous medium in short-wave (geometro-optical) asymptotics. The sum of the zero-and first-order asymptotic series is found. The destruction time of the contrast structure is evaluated.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"140 - 148"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551250","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
Second Harmonic Generation in Structures with Inhomogeneous Magnetization Distribution 非均质磁化分布结构中的二次谐波生成
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700206
I. A. Kolmychek, V. B. Novikov, A. I. Maydykovskiy, T. B. Murzina
{"title":"Second Harmonic Generation in Structures with Inhomogeneous Magnetization Distribution","authors":"I. A. Kolmychek,&nbsp;V. B. Novikov,&nbsp;A. I. Maydykovskiy,&nbsp;T. B. Murzina","doi":"10.3103/S0027134924700206","DOIUrl":"10.3103/S0027134924700206","url":null,"abstract":"<p>The interaction of laser radiation with magnetic media is a rapidly developing field of research, offering broad possibilities both for observing new effects and for studying and characterizing magnetic materials at micro- and macrolevels. This is especially important in connection with the development of modern technologies, which allow the creation of structures with fundamentally new magnetic and optical properties, whose realization is impossible in natural materials. The review presents the results of research on nonlinear optical effects in ferromagnetic nano- and microstructures, as well as films of different compositions. The unique possibilities of nonlinear optical diagnostics of anisotropic, vortex, and exchange-biased magnetic structures, visualization of the micromagnetic structure of surface layers of iron–garnets are demonstrated. The exceptional effectiveness of these approaches is based both on the high sensitivity of the method of optical second harmonic generations to the magnetic state of nanostructures and interfaces, and on the properties of symmetry of tensors of high-order magnetization-induced susceptibility.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"121 - 139"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551252","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
Investigation of (mathbf{1}^{mathbf{-}}_{mathbf{1}}) Excited States of Even–Even Nuclei 偶数核的 $$mathbf{1}^{mathbf{-}}_{mathbf{1}}$ 激发态研究
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700310
P. V. Jolos, E. A. Kolganova
{"title":"Investigation of (mathbf{1}^{mathbf{-}}_{mathbf{1}}) Excited States of Even–Even Nuclei","authors":"P. V. Jolos,&nbsp;E. A. Kolganova","doi":"10.3103/S0027134924700310","DOIUrl":"10.3103/S0027134924700310","url":null,"abstract":"<p>General information on the structure and properties of the first excited <span>(1^{-})</span> states of even–even nuclei is provided. The poorly studied characteristics of <span>(1^{-})</span> states, which are of interest for research within the framework of the experimental program at the Compton source of monochromatic gamma quanta of NCPhM (INOK), are discussed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"186 - 190"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551258","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
X-Ray Lensless Optics and Ptychography X 射线无透镜光学和齿痕摄影
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700309
A. S. Busarov, P. Yu. Glagolev, N. L. Popov
{"title":"X-Ray Lensless Optics and Ptychography","authors":"A. S. Busarov,&nbsp;P. Yu. Glagolev,&nbsp;N. L. Popov","doi":"10.3103/S0027134924700309","DOIUrl":"10.3103/S0027134924700309","url":null,"abstract":"<p>One of the tasks of modern optical methods is the most complete description of the objects under study and the wave fields. For example, properties of the materials under study should be characterized not only by absorption but also by refraction, and the wave fields behind the object and near the detector should be characterized not only by intensity but also by phase. The work of Gerchberg and Saxton in 1972 was the first attempt to accomplish this task without using any optical elements, relying only on a quadratic detector and a computer simulation of the propagation of electromagnetic waves. Today, similar lensless imaging methods are applied across a wide range of wavelengths—from terahertz to hard X-ray. The purpose of this paper is to provide a brief introduction to the theory of lensless methods as applied to the X-ray wavelength range. It also presents the results of recent experiments on lensless imaging of test objects conducted at the Lebedev Physical Institute using lasers.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"214 - 218"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551260","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
PMAXS Library Generation for the Benchmark on Rostov-2 VVER-1000 Reactor 为罗斯托夫-2 VVER-1000 反应堆基准生成 PMAXS 库
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-07-04 DOI: 10.3103/S0027134924700371
Mohsen Kheradmand Saadi, S. Di Pasquale, V. Giusti
{"title":"PMAXS Library Generation for the Benchmark on Rostov-2 VVER-1000 Reactor","authors":"Mohsen Kheradmand Saadi,&nbsp;S. Di Pasquale,&nbsp;V. Giusti","doi":"10.3103/S0027134924700371","DOIUrl":"10.3103/S0027134924700371","url":null,"abstract":"<p>Recently, the OECD/NEA organization developed a benchmark problem based on a specific experiment conducted during the Rostov-2 first start-up procedure. The first phase of this benchmark gives an option to participants to develop their own two-group, assembly-wise homogenized cross sections. The main objective of this research is description of different techniques and methods employed during our own PMAXS libraries generation as well as their verification. The sophisticated SERPENT-2 Monte Carlo code has been employed for neutron transport in five distinct types of fuel assemblies and their corresponding group constants generation in a burnup and branch hierarchical structure. For each assembly 7 burnup states, 3 fuel temperature points, 2 moderator temperature points, 2 boron concentrations and 2 control rod states have been considered. The output files have been converted to PMAXS format using GENPMAXS interface. The verification of generated libraries has been conducted with two independent approaches. The first one is based on the comparison in assembly multiplication factor resulted from SERPENT and GENPMAXS codes. The results showed that the maximum reactivity difference between two codes is only 29 pcm. In second approach, the generated libraries have been fed to the PARCS code and neutronics results compared with reference data. The results showed that at different burnup states, the radial relative power and burnup distributions resulted from PARCS calculations are in good agreement with corresponding reference values. The maximum relative difference was less than 4<span>(%)</span> and the location of ‘‘hot assembly’’ was same.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 2","pages":"239 - 247"},"PeriodicalIF":0.4,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551263","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
Determining the Presence of Packing Defects in Palladium-Based Alloys by X-Ray Diffraction Method 用 X 射线衍射法测定钯基合金中是否存在填料缺陷
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-04-01 DOI: 10.3103/S0027134924700103
O. V. Akimova
{"title":"Determining the Presence of Packing Defects in Palladium-Based Alloys by X-Ray Diffraction Method","authors":"O. V. Akimova","doi":"10.3103/S0027134924700103","DOIUrl":"10.3103/S0027134924700103","url":null,"abstract":"<p>The alloys studied in this work are of interest for the needs of hydrogen energy, electronics, pharmacology. The goal is to identify the regularities of the evolution of defect subsystems, which is necessary for the development of processes to improve the performance indicators of metallic systems. An analysis of the imperfections of the crystal lattice of the alloys Pd<span>({}_{93.5})</span>In<span>({}_{6.0})</span>Ru<span>({}_{0.5})</span> (numerical indices—mass <span>(%)</span>) and Pd<span>({}_{100-x})</span>Pb<span>({}_{x})</span> (<span>(x=5)</span>, <span>(8)</span>, <span>(12)</span>, <span>(16)</span>, <span>(20)</span> mass <span>(%)</span>) was carried out based on the results of X-ray diffraction using synchrotron radiation (SR) from the Kurchatov Research Center. An assessment of the probability of the presence in palladium-based membrane alloys of two-dimensional defects of the crystal lattice, affecting the structure-sensitive properties of materials—packing defects (PD), was conducted. The dependence of the probability of PD formation on the concentration and type of the doping element in palladium has been established.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 1","pages":"58 - 63"},"PeriodicalIF":0.4,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140597677","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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