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Bulgarian Journal of Physics最新文献

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An Oscillating Holographic Dark Energy in f(R) Gravity f(R)引力中的振荡全息暗能量
Bulgarian Journal of Physics Pub Date : 2023-05-19 DOI: 10.55318/bgjp.2023.50.2.190
A. Y. Shaikh, D. Tadas, S. Katore
{"title":"An Oscillating Holographic Dark Energy in f(R) Gravity","authors":"A. Y. Shaikh, D. Tadas, S. Katore","doi":"10.55318/bgjp.2023.50.2.190","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.2.190","url":null,"abstract":"In this article, we investigated a Locally Rotationally Symmetric (LRS) Bianchi-II cosmological model with matter and Holographic Dark Energy (HDE) in the context of $f(R)$ theory of gravity. In order to find exact solutions to the field equations, we assumed that the Shear scalar $(sigma)$ is proportional to Expansion scalar $(theta)$. For HDE, it is observed that the Equation of state (EoS) parameter $ omega_{Lambda} $ has an oscillating nature and lies in $[-0.778,, 1.016].$ Also, we have studied the validity of energy conditions and shows that Null Energy Condition (NEC) is violated near the bouncing points. Moreover, we analysed the physical and geometrical aspects of the investigated model. Keywords: Holographic dark energy, LRS Bianchi-II, $f(R)$ gravity.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129308893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Dynamics of Generalized Ghost Pilgrim Dark Energy in General Relativity 广义相对论中广义幽灵朝圣者暗能量动力学
Bulgarian Journal of Physics Pub Date : 2023-03-03 DOI: 10.55318/bgjp.2023.50.1.001
J. Bharali, K. Das
{"title":"Dynamics of Generalized Ghost Pilgrim Dark Energy in General Relativity","authors":"J. Bharali, K. Das","doi":"10.55318/bgjp.2023.50.1.001","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.1.001","url":null,"abstract":". This work is based on Generalized Ghost Pilgrim Dark Energy (GGPDE) in General Relativity (GR) in the framework of Bianchi type V I 0 space-time. To obtain exact solutions of the field equations, we have used simple parametrization of average scale factor a ( t ) = exp { ( αt + β ) p } as proposed by Mishra and Dua (Astrophys. Space Sci. (2021) 366:6). We have investigated the non-interacting and interacting GGPDE and dark matter (DM). Some well-known parameters like Hubble parameter, equation of state (EOS) parameter, deceleration parameter, etc are constructed for both the models. It is found that de-celeration parameter indicates accelerated phase while EOS parameter represents a cosmological constant for both the models. The stability analysis and energy conditions for both the non-interacting and interacting models are investigated.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130350559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Effects of Noncommutativity on the Energy Spectra for Mass-Dependent Klein-Gordon and Shrödinger Equations with Vector Quark-Antiquark Interaction and Harmonic Oscillator Potential: Application to HLM Systems 非交换性对具有矢量夸克-反夸克相互作用和谐振子势的质量相关Klein-Gordon方程和Shrödinger方程能谱的影响:在HLM系统中的应用
Bulgarian Journal of Physics Pub Date : 2023-03-03 DOI: 10.55318/bgjp.2023.50.1.054
{"title":"The Effects of Noncommutativity on the Energy Spectra for Mass-Dependent Klein-Gordon and Shrödinger Equations with Vector Quark-Antiquark Interaction and Harmonic Oscillator Potential: Application to HLM Systems","authors":"","doi":"10.55318/bgjp.2023.50.1.054","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.1.054","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125087412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Quantizing Simple Periodic Systems Using Bohr's Rule and its Modification 用玻尔规则及其修正量化简单周期系统
Bulgarian Journal of Physics Pub Date : 2023-03-03 DOI: 10.55318/bgjp.2023.50.1.044
T. Shivalingaswamy, G. M. Gayathri, B. Kagali, P. E. Rashmi
{"title":"Quantizing Simple Periodic Systems Using Bohr's Rule and its Modification","authors":"T. Shivalingaswamy, G. M. Gayathri, B. Kagali, P. E. Rashmi","doi":"10.55318/bgjp.2023.50.1.044","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.1.044","url":null,"abstract":". Here we present some new applications of the well-known Bohr’s quantisation rule along with its modifications to deduce quantised energy levels of some simple systems. The values agree quite well with those derived from proper quantum mechanics. The article has a pedagogical value.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123825376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Leptonic Decay Widths and Decay Constants of ρ, ω, ϕ, ψ and Υ Mesons in a Dirac Formalism 狄拉克形式中ρ， ω， φ， ψ和Υ介子的轻子衰变宽度和衰变常数
Bulgarian Journal of Physics Pub Date : 2023-03-03 DOI: 10.55318/bgjp.2023.50.1.016
{"title":"Leptonic Decay Widths and Decay Constants of ρ, ω, ϕ, ψ and Υ Mesons in a Dirac Formalism","authors":"","doi":"10.55318/bgjp.2023.50.1.016","DOIUrl":"https://doi.org/10.55318/bgjp.2023.50.1.016","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130353600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method 陶瓷法合成添加0.8wt%V2O5的Zn掺杂NiFe2O4的结构、电学和磁学性能
Bulgarian Journal of Physics Pub Date : 2022-12-01 DOI: 10.55318/bgjp.2022.49.4.362
{"title":"Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method","authors":"","doi":"10.55318/bgjp.2022.49.4.362","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.4.362","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129330477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 Estimated Daily Intake of Toxic Metals and Potential Health Risks in Oreochromis noliticus (Tilapia Fish) 罗非鱼(Oreochromis noliticus)每日有毒金属摄取量及潜在健康风险调查
Bulgarian Journal of Physics Pub Date : 2022-12-01 DOI: 10.55318/bgjp.2022.49.4.386
K. Ogungbemi, I. Y. Nsa, L. Owoade
{"title":"Investigation of Estimated Daily Intake of Toxic Metals and Potential Health Risks in Oreochromis noliticus (Tilapia Fish)","authors":"K. Ogungbemi, I. Y. Nsa, L. Owoade","doi":"10.55318/bgjp.2022.49.4.386","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.4.386","url":null,"abstract":". Oreochromis noliticus (Tilapia fish) is one of the major sources of protein and its readily available in all the markets, Agboyi river is one of the major outlet of Tilapia fish in the southwest Nigeria this was the motivation for this study. Pb, Cr, Mn, Cd, Zn and Ni were identified from Oreochromis noliticus (Tilapia fish). Objectives: This study aimed to quantify the level of heavy metals and determine the health risk index (HRI) level using estimated daily intake (EDI) of Oreochromis noliticus in samples collected. Methodology: Oreochromis noliticus samples were collected (samples D1 to D3) from Agboyi river a fresh water river, and dried then the edible tissues were separated from the other parts of the fish, this was then digested for a Perkin-Elmer model 306 Atomic Absorption spectrophotometer (AAS) for the analysis to ascertain the levels of concentration of the metals identified in the samples. Results: From the samples D1 to D8, for Pb concentrations is the highest in sample D8 with the value of 7 . 32 ± 0 . 65 mg/kg and lowest in the sample D6 with the value of 0 . 02 ± 0 . 33 mg/kg. The Ni concentration is highest in sample D5 with","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131603642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bound State Solutions of the Schrödinger Equation with Frost-Musulin Potential Using the Nikiforov-Uvarov-Functional Analysis (NUFA) Method 用nikiforov - uvarov泛函分析(NUFA)方法求解Frost-Musulin势Schrödinger方程的束缚态
Bulgarian Journal of Physics Pub Date : 2022-12-01 DOI: 10.55318/bgjp.2022.49.4.329
E. Inyang, E. Inyang, Eddy S. William, J. Ntibi, Efiong A. Ibanga
{"title":"Bound State Solutions of the Schrödinger Equation with Frost-Musulin Potential Using the Nikiforov-Uvarov-Functional Analysis (NUFA) Method","authors":"E. Inyang, E. Inyang, Eddy S. William, J. Ntibi, Efiong A. Ibanga","doi":"10.55318/bgjp.2022.49.4.329","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.4.329","url":null,"abstract":". The Schrödinger equation under the Frost-Musulin potential (FMP) energy function is solved using the Nikiforov-Uvarov-Functional Analysis (NUFA) method. We obtained the analytic solutions of the energy equation and the wave function in closed form with Greene-Aldrich approximation. The energy equation was used to obtain bound states energy eigenvalues of FMP for H 2 , I 2 and N 2 diatomic molecules for various quantum states. To test the accuracy of our results, we computed the bound states energy eigenvalues of FMP which are in excellent agreement with the reports of other researchers.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122207468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Evolution of Viscous Dark Energy Models in Brans-Dicke Theory of Gravitation Brans-Dicke引力理论中粘性暗能量模型的演化
Bulgarian Journal of Physics Pub Date : 2022-12-01 DOI: 10.55318/bgjp.2022.49.4.410
D. Kapse, S. Katore
{"title":"Evolution of Viscous Dark Energy Models in Brans-Dicke Theory of Gravitation","authors":"D. Kapse, S. Katore","doi":"10.55318/bgjp.2022.49.4.410","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.4.410","url":null,"abstract":". The present study is based on Bianchi type-V universe filled with dark energy and viscous fluid in the framework of Brans-Dicke theory of gravitation. We have discussed two models: the special form of deceleration parameter model and hybrid law model. It is found that due to viscosity, the effective equation of state parameter of dark energy models behaves like a phantom dark energy. An estimate of the dimensionless jerk and snap parameters are also studied for the dark energy models. It is observe that in the investigated models jerk and snap parameter support the recent observational data.","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114270343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phantomic Behaviour of Generalized Ghost Pilgrim Dark Energy Models in Self Creation Theory 自我创造理论中广义鬼朝圣者暗能量模型的幻影行为
Bulgarian Journal of Physics Pub Date : 2022-12-01 DOI: 10.55318/bgjp.2022.49.4.297
{"title":"Phantomic Behaviour of Generalized Ghost Pilgrim Dark Energy Models in Self Creation Theory","authors":"","doi":"10.55318/bgjp.2022.49.4.297","DOIUrl":"https://doi.org/10.55318/bgjp.2022.49.4.297","url":null,"abstract":"","PeriodicalId":217381,"journal":{"name":"Bulgarian Journal of Physics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132199666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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