JETP Letters最新文献_第9页

Scattering of a Quasi-Monochromatic Gaussian Beam of Light on a Two-Dimensional Photonic Crystal 二维光子晶体上准单色高斯光束的散射

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364024605256

D. Yu. Sergeeva, I. V. Bekrenev, A. A. Tishchenko

引用次数: 0

Indication of the Electron-to-Proton Mass Ratio Variation in the Galaxy 星系中电子-质子质量比变化的指示

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025606025

J. S. Vorotyntseva, S. A. Levshakov

{"title":"Indication of the Electron-to-Proton Mass Ratio Variation in the Galaxy","authors":"J. S. Vorotyntseva, S. A. Levshakov","doi":"10.1134/S0021364025606025","DOIUrl":"10.1134/S0021364025606025","url":null,"abstract":"Near (~100 pc) and far (~8.7 kpc) relative to the Galactic center, the molecular clouds SgrB2(N) and Orion-KL exhibit different values of the fundamental physical constant μ = me/mp, which is the electron-to-proton mass ratio. Measured frequency difference between the emission lines of methanol (CH3OH), ({{J}_{{{{K}_{u}}}}}) → ({{J}_{{{{K}_{ell }}}}}) = 63 → 52A+ 542 000.981 MHz, 63 → 52A– 542 081.936 MHz, and 80 → 7–1E 543 076.194 MHz, observed with the space observatory Herschel toward SgrB2(N) and Orion-KL corresponds to (Sgr-Ori): Δμ/μ = (‒3.7 ± 0.5) × 10–7 (1σ C.L.). At the same time, comparison of the same methanol lines in Orion-KL with laboratory frequencies shows no significant changes in μ (Ori-lab): Δμ/μ = (–0.5 ± 0.6) × 10–7, while a comparison between SgrB2(N) and laboratory lines indicates a lower value of μ near the Galactic center (Sgr-lab): Δμ/μ = (–4.2 ± 0.7) × 10–7. The reduced value of μ in SgrB2(N) is not explained by known systematic effects and requires further investigation.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 8","pages":"589 - 594"},"PeriodicalIF":1.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606025.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171604","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

Inverse Quantum Problem of Multidimensional Photocount Statistics 多维光计数统计的逆量子问题

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605937

A. S. Chirkin

引用次数: 0

Competition between the Formation and Decomposition of a Solid Solution in Al–Cu Alloys under High-Pressure Torsion 高压扭转下Al-Cu合金中固溶体形成与分解的竞争

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605822

B. B. Straumal, O. A. Kogtenkova, A. S. Gornakova, M. A. Khorosheva, P. B. Straumal, P. A. Prokofiev, D. Bradai, A. R. Kilmametov

{"title":"Competition between the Formation and Decomposition of a Solid Solution in Al–Cu Alloys under High-Pressure Torsion","authors":"B. B. Straumal, O. A. Kogtenkova, A. S. Gornakova, M. A. Khorosheva, P. B. Straumal, P. A. Prokofiev, D. Bradai, A. R. Kilmametov","doi":"10.1134/S0021364025605822","DOIUrl":"10.1134/S0021364025605822","url":null,"abstract":"The competition between the formation and decomposition of a solid solution under high-pressure torsion in an Al–6 wt % Cu alloy pre-annealed at 300 and 530°C has been identified for the first time. After annealing at 300°C, the solid solution in the matrix is almost Cu-free, while annealing at 530°C yields a solid solution containing about 5 wt % Cu, which is close to the maximum possible value. In the first sample, high-pressure torsion leads to the enrichment of the solid solution with Cu due to the partial decomposition of Al2Cu phase particles. In the second sample, on the contrary, the solid solution decomposes with the formation of Al2Cu particles. As a result of the competition between these processes, a dynamic equilibrium is established, and the Cu concentration in the matrix approaches a steady-state value of css = 2 wt % from both sides. The value css corresponds to the solubility of Cu in the solid solution at Teff = (400 ± 20)°C. This phenomenon can be explained by the increased concentration of defects (in particular, vacancies) in the steady state under high-pressure torsion, which is equivalent to a temperature increase.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 8","pages":"619 - 624"},"PeriodicalIF":1.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170959","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

Mosaic Structure of Quasicrystals of Three Hexagonal Atomic Layers 三六方原子层准晶体的镶嵌结构

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605998

L. A. Chernozatonskii

引用次数: 0

Electrically Induced Change in the Orientation of the Helix Axis in a Chiral Liquid Crystal Layer with Photoinduced Binary Anchoring 具有光致二元锚定的手性液晶层中螺旋轴方向的电诱导变化

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-30 DOI: 10.1134/S0021364025605858

V. V. Lazarev, I. V. Simdyankin, S. P. Palto

引用次数: 0

Phase Diagram of UTe2 UTe2相图

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-26 DOI: 10.1134/S0021364025606797

V. P. Mineev

引用次数: 0

Fundamentals of Direct Multi-Wavelength Diode Pumping of Ti:Sapphire Lasers for Enhanced Optical-to-Optical Conversion Efficiency Across a Broad Spectral Range 直接多波长二极管泵浦Ti的基本原理：蓝宝石激光器在宽光谱范围内增强光对光转换效率

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-26 DOI: 10.1134/S0021364025606773

K. E. Reznikov, A. O. Mavritskiy, M. N. Esaulkov, A. V. Naumov, A. V. Konyashchenko

引用次数: 0

First Law of de Sitter Thermodynamics 德西特热力学第一定律

IF 1.3 4区物理与天体物理

JETP Letters Pub Date : 2025-05-13 DOI: 10.1134/S0021364025606426

G. E. Volovik

{"title":"First Law of de Sitter Thermodynamics","authors":"G. E. Volovik","doi":"10.1134/S0021364025606426","DOIUrl":"10.1134/S0021364025606426","url":null,"abstract":"The de Sitter state has a special symmetry: it is homogeneous, and its curvature is constant in space. Since all the points in the de Sitter space are equivalent, this state is described by local thermodynamics. This state has the local temperature (T = H{text{/}}pi ) (which is twice the Gibbons–Hawking temperature), the local entropy density, the local energy density, and the local gravitational degrees of freedom including the scalar curvature (mathcal{R}) and the effective gravitational coupling K. On the other hand, there is the cosmological horizon, which can also be characterized by the thermodynamic relations. We consider the connections between the local thermodynamics and the thermodynamics of the cosmological horizon. In particular, there is the holographic connection between the entropy density integrated over the Hubble volume and the Gibbons–Hawking entropy of the horizon, ({{S}_{{{text{volume}}}}} = {{S}_{{{text{horizon}}}}} = A{text{/}}4G). We also consider the first law of thermodynamics in these two approaches. In the local thermodynamics, on the one hand, the first law is valid for an arbitrary volume (V) of de Sitter space. On the other hand, the first law is also applicable to the thermodynamics of the horizon. In both cases, the temperature is the same. This consideration is extended to the contracting de Sitter with its negative entropy, ({{S}_{{{text{volume}}}}} = {{S}_{{{text{horizon}}}}} = - A{text{/}}4G).","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"121 10","pages":"766 - 770"},"PeriodicalIF":1.3,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025606426.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165281","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

Measurement of the Anisotropy of the Angular Distributions of Fragments and the Cross Section for the Neutron-Induced Fission of 242Pu Nuclei in the Energy Range of 0.3–500 MeV 242Pu核在0.3 ~ 500 MeV能量范围内裂变碎片角分布和截面的各向异性测量

IF 1.4 4区物理与天体物理

JETP Letters Pub Date : 2025-05-12 DOI: 10.1134/S0021364025605676

A. S. Vorobyev, A. M. Gagarski, O. A. Shcherbakov, L. A. Vaishnene, A. M. Tiagelskaia, N. M. Olkhovich, A. L. Barabanov, T. E. Kuz’mina

引用次数: 0