Nuclear Physics B最新文献_第3页

Cooling-heating properties of the FRW universe in gravity with a generalized conformal scalar field 具有广义共形标量场的引力中 FRW 宇宙的冷却-加热特性

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-17 DOI: 10.1016/j.nuclphysb.2024.116719

Haximjan Abdusattar , Shi-Bei Kong

{"title":"Cooling-heating properties of the FRW universe in gravity with a generalized conformal scalar field","authors":"Haximjan Abdusattar , Shi-Bei Kong","doi":"10.1016/j.nuclphysb.2024.116719","DOIUrl":"10.1016/j.nuclphysb.2024.116719","url":null,"abstract":"<div><div>In this paper, within the framework of modified gravity involving a conformal scalar field, we investigate the Joule-Thomson expansion of the Friedmann-Robertson-Walker (FRW) universe to identify cooling and heating regions. We observe a divergence in the Joule-Thomson coefficient (<em>μ</em>), precisely at the apparent horizon (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>A</mi></mrow></msub><mo>=</mo><msqrt><mrow><mo>−</mo><mn>2</mn><mi>α</mi></mrow></msqrt></math></span>) of the FRW universe, under conditions of negative gravitational coupling (<span><math><mi>α</mi><mo><</mo><mn>0</mn></math></span>), which aligns with a thermodynamic singularity. Furthermore, we determine the inversion temperature and pressure for the FRW universe, and elucidate the salient features of inversion and isenthalpic curves in the temperature-pressure (<em>T</em>-<em>P</em>) plane. We compare these findings with results obtained under Einstein gravity, discussing the influence of the modification term on the cooling and heating properties of the FRW universe. This work presents insights into the formation of cooling and heating regions within the FRW universe, contributing to a deeper understanding of the physical mechanisms behind cosmic expansion history.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116719"},"PeriodicalIF":2.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hyperlogarithms in the theory of turbulence of infinite dimension 无限维湍流理论中的超对数

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-16 DOI: 10.1016/j.nuclphysb.2024.116716

Loran Ts. Adzhemyan , Daniil A. Evdokimov , Mikhail V. Kompaniets

引用次数: 0

Correlation functions of the six-vertex IRF model and its quantum spin chain 六顶点 IRF 模型及其量子自旋链的相关函数

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-16 DOI: 10.1016/j.nuclphysb.2024.116715

T.S. Tavares , G.A.P. Ribeiro

{"title":"Correlation functions of the six-vertex IRF model and its quantum spin chain","authors":"T.S. Tavares , G.A.P. Ribeiro","doi":"10.1016/j.nuclphysb.2024.116715","DOIUrl":"10.1016/j.nuclphysb.2024.116715","url":null,"abstract":"<div><div>We consider the interaction-round-a-face version of the isotropic six-vertex model. The associated spin chain is made of two coupled Heisenberg spin chains with different boundary twists. The phase diagram of the model and the long distance correlations were studied in Tavares and Ribeiro (2023) <span><span>[43]</span></span>. Here, we compute the short-distance correlation functions of the model in the ground state for finite system sizes via non-linear integral equations and in the thermodynamic limit. This was possible since the model satisfies the face version of the discrete quantum Knizhnik-Zamolodchikov (qKZ) equation. A suitable ansatz for the density matrix is proposed in the form of a direct sum of two Heisenberg density matrices, which allows us to obtain the discrete functional equation for the two-site function <span><math><mi>ω</mi><mo>(</mo><msub><mrow><mi>λ</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>,</mo><msub><mrow><mi>λ</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>)</mo></math></span>. Thanks to the known results on the factorization of correlation functions of the Heisenberg chain, we are able to compute the density matrix of the IRF model for up to four sites and its associated spin chain for up to three sites.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116715"},"PeriodicalIF":2.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Bernstein operators for universal characters and symplectic universal characters 伯恩斯坦算子的通用字符和交映通用字符

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-16 DOI: 10.1016/j.nuclphysb.2024.116718

Denghui Li, Zhaowen Yan

引用次数: 0

Bell-CHSH inequality and unitary operators 贝尔-CCH 不等式和单元算子

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-16 DOI: 10.1016/j.nuclphysb.2024.116717

M.S. Guimaraes , I. Roditi , S.P. Sorella

引用次数: 0

Erratum to “Braneworlds in bumblebee gravity” [Nucl. Phys. B 996 (2023) 116374] 对 "大黄蜂引力中的分支世界 "的勘误 [Nucl.

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-15 DOI: 10.1016/j.nuclphysb.2024.116714

M.A. Marques , R. Menezes , A.Yu. Petrov , P.J. Porfírio

引用次数: 0

Non-commutative Schwarzschild black hole surrounded by Perfect fluid dark matter: Plasma lensing and thermodynamics analysis 被完美流体暗物质包围的非交换性施瓦兹柴尔德黑洞：等离子体透镜和热力学分析

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-15 DOI: 10.1016/j.nuclphysb.2024.116713

Yihu Feng , Allah Ditta , G. Mustafa , S.K. Maurya , Asif Mahmood , Farruh Atamurotov

{"title":"Non-commutative Schwarzschild black hole surrounded by Perfect fluid dark matter: Plasma lensing and thermodynamics analysis","authors":"Yihu Feng , Allah Ditta , G. Mustafa , S.K. Maurya , Asif Mahmood , Farruh Atamurotov","doi":"10.1016/j.nuclphysb.2024.116713","DOIUrl":"10.1016/j.nuclphysb.2024.116713","url":null,"abstract":"<div><div>The focus of this paper is to examine the properties of thermodynamics and weak gravitational lensing about the geometry of black holes within the context of a non-commutative Schwarzschild black hole surrounded by Perfect fluid dark matter. We examine the geometric mass and thermal temperature in this context to discuss the stability of the black hole solution. We examine the phase transition and stability while calculating the specific heat. We also research the black hole's energy emission process. We deduce that our researched black hole solution is thermally stable based on its thermodynamic features. Furthermore, we analyze uniform and non-uniform plasma by calculating the deflection angle, and we examine gravitational lensing in the weak plasma field. It is observed that in uniform plasma, the deflection angle is larger than in non-uniform plasma. We also looked at the image magnification caused by source brightness and found that the source image is enlarged more in uniform plasma than in non-uniform plasma.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116713"},"PeriodicalIF":2.5,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Horizon replicas in black hole shadows 黑洞阴影中的地平线复制品

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-09 DOI: 10.1016/j.nuclphysb.2024.116700

D. Pugliese , H. Quevedo

引用次数: 0

Five-dimensional compact stars in Einstein-Gauss-Bonnet gravity 爱因斯坦-高斯-波奈引力中的五维紧凑星体

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-09 DOI: 10.1016/j.nuclphysb.2024.116702

Juan M.Z. Pretel , Ayan Banerjee , Anirudh Pradhan

引用次数: 0

Black holes, complex curves, and graph theory: Revising a conjecture by Kasner 黑洞、复曲线和图论：修正卡斯纳的猜想

IF 2.5 3区物理与天体物理

Nuclear Physics B Pub Date : 2024-10-09 DOI: 10.1016/j.nuclphysb.2024.116711

Yen Chin Ong

{"title":"Black holes, complex curves, and graph theory: Revising a conjecture by Kasner","authors":"Yen Chin Ong","doi":"10.1016/j.nuclphysb.2024.116711","DOIUrl":"10.1016/j.nuclphysb.2024.116711","url":null,"abstract":"<div><div>The ratios <span><math><msqrt><mrow><mn>8</mn><mo>/</mo><mn>9</mn></mrow></msqrt><mo>=</mo><mn>2</mn><msqrt><mrow><mn>2</mn></mrow></msqrt><mo>/</mo><mn>3</mn><mo>≈</mo><mn>0.9428</mn></math></span> and <span><math><msqrt><mrow><mn>3</mn></mrow></msqrt><mo>/</mo><mn>2</mn><mo>≈</mo><mn>0.866</mn></math></span> appear in various contexts of black hole physics, as values of the charge-to-mass ratio <span><math><mi>Q</mi><mo>/</mo><mi>M</mi></math></span> or the rotation parameter <span><math><mi>a</mi><mo>/</mo><mi>M</mi></math></span> for Reissner-Nordström and Kerr black holes, respectively. In this work, in the Reissner-Nordström case, I relate these ratios with the quantization of the horizon area, or equivalently of the entropy. Furthermore, these ratios are related to a century-old work of Kasner, in which he conjectured that certain sequences arising from complex analysis may have a quantum interpretation. These numbers also appear in the case of Kerr black holes, but the explanation is not as straightforward. The Kasner ratio may also be relevant for understanding the random matrix and random graph approaches to black hole physics, such as fast scrambling of quantum information, via a bound related to Ramanujan graph. Intriguingly, some other pure mathematical problems in complex analysis, notably complex interpolation in the unit disk, appear to share some mathematical expressions with the black hole problem and thus also involve the Kasner ratio.</div></div>","PeriodicalId":54712,"journal":{"name":"Nuclear Physics B","volume":"1008 ","pages":"Article 116711"},"PeriodicalIF":2.5,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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