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Polarization of the Fulling-Rindler Vacuum in Models with Compact Dimensions 紧尺寸模型中富勒-伦德勒真空的极化
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-09-04 DOI: 10.54503/18291171-2023.16.2-83
V. Kotanjyan
{"title":"Polarization of the Fulling-Rindler Vacuum in Models with Compact Dimensions","authors":"V. Kotanjyan","doi":"10.54503/18291171-2023.16.2-83","DOIUrl":"https://doi.org/10.54503/18291171-2023.16.2-83","url":null,"abstract":"We investigate the expectation value of the field squared for a charged scalar field in the \u0000Rindler spacetime with toroidally compact dimensions. The expectation values are compared for \u0000the Fulling-Rindler and Minkowski vacua. For general phases in the periodicity conditions on the \u0000field operator along compact dimensions, integral representations are provided for the difference of \u0000those expectation values. The vacuum expectation value of the field squared is an even periodic \u0000function of the magnetic flux enclosed by compact dimensions. Simple asymptotic expressions are \u0000given near the Rindler horizon and for small accelerations. We show that the mean field squared in \u0000the Fulling-Rindler vacuum is smaller than the respective expectation value for the Minkowski \u0000vacuum.","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"223 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85944736","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
Nearest-Neighbor Tunneling Ansatz in the Bose-Hubbard Model Bose-Hubbard模型中的最近邻隧道分析
4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-09-04 DOI: 10.54503/18291171-2023.16.2-35
Moorad Alexanian
{"title":"Nearest-Neighbor Tunneling Ansatz in the Bose-Hubbard Model","authors":"Moorad Alexanian","doi":"10.54503/18291171-2023.16.2-35","DOIUrl":"https://doi.org/10.54503/18291171-2023.16.2-35","url":null,"abstract":"","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135402755","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 Electroinduced Bremsstrahlung in Water 水中电致轫致效应的研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020032
V. S. Arakelyan, R. N. Balasanyan, I. G. Grigoryan, P. G. Muzhikyan, R. B. Kostanyan
{"title":"Investigation of Electroinduced Bremsstrahlung in Water","authors":"V. S. Arakelyan,&nbsp;R. N. Balasanyan,&nbsp;I. G. Grigoryan,&nbsp;P. G. Muzhikyan,&nbsp;R. B. Kostanyan","doi":"10.1134/S1068337223020032","DOIUrl":"10.1134/S1068337223020032","url":null,"abstract":"<p>The phenomenon of electrically induced generation of bremsstrahlung in water was experimentally observed for the first time when water was exposed to electric pulses with steep fronts. The dependence of the X-ray intensity on the frequency of electrical pulses and the magnitude of the potential difference applied to the electrodes in water has been studied. The physical mechanism of X-ray excitation in water with the formation of quasi-neutrons is proposed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"129 - 133"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4577142","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 Nanosecond Laser Pulses Optical Detection in Ferrimagnetic Crystals Y3Fe5O12 and YFeO3 纳秒激光脉冲对Y3Fe5O12和YFeO3铁磁晶体光学检测的研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020068
D. H. Baghdasaryan, G. S. Gevorkyan, A. H. Makaryan, Y. S. Sahakyan, V. R. Tadevosyan
{"title":"Investigation of Nanosecond Laser Pulses Optical Detection in Ferrimagnetic Crystals Y3Fe5O12 and YFeO3","authors":"D. H. Baghdasaryan,&nbsp;G. S. Gevorkyan,&nbsp;A. H. Makaryan,&nbsp;Y. S. Sahakyan,&nbsp;V. R. Tadevosyan","doi":"10.1134/S1068337223020068","DOIUrl":"10.1134/S1068337223020068","url":null,"abstract":"<p>The optical detection of a nanosecond laser pulse in transparent ferrimagnetic single crystals of yttrium iron garnet and yttrium orthoferrite in the IR range at room temperature was experimentally studied. A linearly polarized neodymium laser (wavelength 1.06 μm) operating in the Q-switched mode was used as the source of electromagnetic radiation. The pulse duration was about 20 ns, and the peak power ∼10 MW. It was found that the ferrimagnetic detector has a sufficient response time to detect nanosecond laser pulses. The amplitude of the detected signal strongly depends on the external bias magnetic field and correlates well with the nonlinearity of the static magnetization curve of the ferrimagnetic crystal sample used.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"184 - 187"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4577582","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 the Excitation Functions of Proton-Induced Reactions on Natural Gadolinium Using the Nuclear Interaction Codes TALYS 1.96 and EMPIRE 3.2 利用核相互作用代码TALYS 1.96和EMPIRE 3.2研究天然钆质子诱导反应的激发函数
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020147
H. A. Mkrtchyan
{"title":"Investigation of the Excitation Functions of Proton-Induced Reactions on Natural Gadolinium Using the Nuclear Interaction Codes TALYS 1.96 and EMPIRE 3.2","authors":"H. A. Mkrtchyan","doi":"10.1134/S1068337223020147","DOIUrl":"10.1134/S1068337223020147","url":null,"abstract":"<p>The excitation functions in proton-induced reactions on natural gadolinium <sup>nat</sup>Gd(p,xn)<sup>152,153,154,156,160</sup>Tb were calculated for terbium isotopes, which are of interest from both scientific and application points of view. The calculations were performed in wide energy range of proton beam from the corresponding thresholds of reactions up to 70 MeV. The calculations were carried out using TALYS 1.96 and EMPIRE 3.2 nuclear reaction codes. Calculations have been done by different models inherent in these codes. The obtained results are compared with published experimental data. The discrepancies between experimental and theoretical data were discussed, which indicates the need to expand the experimental data base in order to improve the theoretical models.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"105 - 111"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4577583","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
Human Serum Albumin Interaction with Methyl Violet under the Influence of Millimeter-Range Electromagnetic Waves 毫米波影响下人血清白蛋白与甲基紫的相互作用
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020160
P. O. Vardevanyan, M. A. Shahinyan, M. A. Parsadanyan, S. V. Grigoryan, V. P. Kalantaryan
{"title":"Human Serum Albumin Interaction with Methyl Violet under the Influence of Millimeter-Range Electromagnetic Waves","authors":"P. O. Vardevanyan,&nbsp;M. A. Shahinyan,&nbsp;M. A. Parsadanyan,&nbsp;S. V. Grigoryan,&nbsp;V. P. Kalantaryan","doi":"10.1134/S1068337223020160","DOIUrl":"10.1134/S1068337223020160","url":null,"abstract":"<p>The effect of a millimeter-wave range of electromagnetic waves (MM EMW) on methyl or crystal violet interaction with human serum albumin (HSA) has been studied using UV-denaturation, fluorescence spectroscopy, and CD spectroscopy methods. It was revealed that MM EMW irradiation results in the weakening of the stability of HSA and decreases the interaction force between HSA and methyl violet (MV). It was also shown that MM EMW irradiation by non-resonant frequency of the water affects the structure of HSA immediately, and changes its secondary structure, while the irradiation by water-resonant frequency does not invoke structural changes, but weakens the stability to a higher degree.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"198 - 203"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4573290","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
Modelling of the Porous and Black Silicon Reflection Characteristics 多孔和黑硅反射特性的建模
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020056
G. Y. Ayvazyan
{"title":"Modelling of the Porous and Black Silicon Reflection Characteristics","authors":"G. Y. Ayvazyan","doi":"10.1134/S1068337223020056","DOIUrl":"10.1134/S1068337223020056","url":null,"abstract":"<p>The results of FDTD modeling of the spectral reflection characteristics of periodic systems with unit cells in the form of cylinders and cones corresponding to the morphology of the porous and black silicon layer presented. The antireflection behavior of these systems with a characteristic size on the order of several hundreds of nanometers is analyzed. The properties of reflection depending on the geometric parameters of unit cells and the angle of incidence of light rays are investigated. It is shown that periodic systems with cones are superior in antireflection properties to systems with cylinders.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"164 - 171"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4573297","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
Vector Monochromatic Diffraction Fields and Fields of Charges in Electrodynamics 矢量单色衍射场与电动力学中的电荷场
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S106833722302007X
M. K. Balyan
{"title":"Vector Monochromatic Diffraction Fields and Fields of Charges in Electrodynamics","authors":"M. K. Balyan","doi":"10.1134/S106833722302007X","DOIUrl":"10.1134/S106833722302007X","url":null,"abstract":"<p>In previous works, the electromagnetic field in an arbitrarily chosen volume is represented in vector form including surface and volume integrals using the found vector Green’s function. Surface integrals describe the diffraction of the field created by charges external to the volume, and volume integrals describe the fields created by charges moving inside the volume. In this work, passing to the Fourier transforms in the previously found vector formulas of the field, expressions for a monochromatic electromagnetic field are obtained. Integro-differential equations are also obtained for a monochromatic electromagnetic field in a non-magnetic medium, in the presence of charges with a given motion. Because both diffraction fields and the fields of charges with a given motion, as well as the fields of charges induced in the medium, are considered together, these equations are obtained for the first time.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"188 - 192"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4576773","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
Comparative Analysis of Theoretical and Experimental Interaction Cross-Sections of Deuteron and Enriched Lead 204Pb, 206Pb, 207Pb, and 208Pb 氘与富集铅204Pb、206Pb、207Pb、208Pb相互作用截面的理论与实验对比分析
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020093
S. Gaginyan
{"title":"Comparative Analysis of Theoretical and Experimental Interaction Cross-Sections of Deuteron and Enriched Lead 204Pb, 206Pb, 207Pb, and 208Pb","authors":"S. Gaginyan","doi":"10.1134/S1068337223020093","DOIUrl":"10.1134/S1068337223020093","url":null,"abstract":"<p>The modeling calculation of cross-sections of residual nuclei for isotopically enriched lead (<sup>204</sup>Pb, <sup>206</sup>Pb, <sup>207</sup>Pb, and <sup>208</sup>Pb) targets irradiated by 2.2 GeV/nucleon deuteron beam has been made by the Monte Carlo N-Particle Transport Code (MCNP). The experimental results were obtained on the Nuclotron of the Laboratory of High Energy Physics at the Joint Institute for Nuclear Research in Dubna. The production cross-sections of target fragments were determined for about 90 residual nuclei on each target mentioned above by the method of induced activity. The first-time irradiation has been made on the <sup>204</sup>Pb in the GeV range. The comparison of theoretical computations and experimental results showed good agreement between the experiment and simulation data.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"112 - 116"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4577584","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
Contribution of the Interference of the O7–O8 for the B → Xsγγ Decay O7-O8干涉对B→Xsγγ衰变的贡献
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020044
H. H. Asatryan, H. M. Asatrian, S. A. Tumasyan
{"title":"Contribution of the Interference of the O7–O8 for the B → Xsγγ Decay","authors":"H. H. Asatryan,&nbsp;H. M. Asatrian,&nbsp;S. A. Tumasyan","doi":"10.1134/S1068337223020044","DOIUrl":"10.1134/S1068337223020044","url":null,"abstract":"<p>Rare decays of <i>B</i>-mesons allow one the investigation of physics outside of the SM. For <span>(B to {{X}_{s}}{{gamma gamma }})</span> processes, the potential new physics should be visible not only for the width of the decay but also in the differential distributions for the parameters <span>(({{s}_{1}},{{s}_{2}}))</span>, defined as <span>({{s}_{i}} = {{({{p}_{b}} - {{q}_{i}})}^{2}}{text{/}}m_{b}^{2})</span>, (<i>i</i> = 1, 2), where <span>({{p}_{b}})</span>, <span>({{q}_{1}},{{q}_{2}})</span> are the momenta of the b-quark and the two photons. In this work, the contribution of the order <span>({{{{alpha }}}_{s}})</span> of the interference of the operators <span>({{O}_{7}} - {{O}_{8}})</span> was calculated. We also consider the dependence of the results from the mass of the s-quark by changing <span>({{m}_{s}})</span> in the range of 400–600 MeV. The contribution of the interference of the operators <span>({{O}_{7}} - {{O}_{8}})</span> into the width of the decay <span>(B to {{X}_{s}}{{gamma gamma }})</span> in the regions of the phase space considered is equal to 2–3%.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"117 - 121"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4574732","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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