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Bulk Viscous String Cosmological Model with Power Law Volumetric Expansion in Teleparallel Gravity 远平行重力下具有幂律体积膨胀的体粘弦宇宙学模型
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-14 DOI: 10.1007/s10511-023-09774-2
Kalpana Pawar, A. K. Dabre
{"title":"Bulk Viscous String Cosmological Model with Power Law Volumetric Expansion in Teleparallel Gravity","authors":"Kalpana Pawar,&nbsp;A. K. Dabre","doi":"10.1007/s10511-023-09774-2","DOIUrl":"10.1007/s10511-023-09774-2","url":null,"abstract":"<div><div><p>In this paper, we have investigated the Bianchi-type V cosmological model which is spatially homogeneous and anisotropic in presence of bulk viscous fluid containing one-dimensional cosmic string. We have obtained the exact solutions of highly non-linear differential field equations considering the power-law volumetric expansion of the universe and f (T) = T formalism. Some physical and kinematical properties of the constructed model have been discussed and presented graphically and it is interesting to note that the resultant model resembles the recent observational data.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4561684","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: 1
Accelerating Kaluza-Klein Universe in Modified Theory of Gravitation 修正引力理论中的加速Kaluza-Klein宇宙
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-13 DOI: 10.1007/s10511-023-09773-3
S. D. Katore, S. P. Hatkar, D. P. Tadas
{"title":"Accelerating Kaluza-Klein Universe in Modified Theory of Gravitation","authors":"S. D. Katore,&nbsp;S. P. Hatkar,&nbsp;D. P. Tadas","doi":"10.1007/s10511-023-09773-3","DOIUrl":"10.1007/s10511-023-09773-3","url":null,"abstract":"<div><div><p>The purpose of this paper is to study the Kaluza-Klein universe in the context of the <i>f</i> (<i>R</i>, <i>T</i>) gravity theory using magnetized strange quark matter (MSQM). To obtain exact solutions of field equations, we assume two types of volumetric expansion: power law and exponential law volumetric expansions. The violation of energy conditions has been studied. The physical and geometrical properties of the examined model have also been investigated thoroughly.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4525214","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: 1
Effect of the Interaction Between Hyperons on the Moment of Inertia of the Proto Neutron Stars 超子相互作用对原中子星转动惯量的影响
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09772-4
Xian-Feng Zhao
{"title":"Effect of the Interaction Between Hyperons on the Moment of Inertia of the Proto Neutron Stars","authors":"Xian-Feng Zhao","doi":"10.1007/s10511-023-09772-4","DOIUrl":"10.1007/s10511-023-09772-4","url":null,"abstract":"<div><div><p>Effect of the interaction between hyperons on the moment of inertia of proto neutron stars (PNSs) PSR J0740+6620, PSR J0348+0432, PSR J1614-2230 and PSR J0737-3039A is examined by means of relativistic mean field theory. Taking into account the interaction between hyperons, the mass M of the PNS decreases with respect to the same radius R, the energy density ε increases with respect to the same pressure p, and the moment of inertia I of the PNS decreases with respect to the same central energy density ε<sub>c</sub> . Under the constraint of the mass of the PNS, considering the interaction between hyperons, the larger the mass of the PNS, the more the radius and moment of inertia of the PNS decrease, while the more energy density and pressure increase. For smaller PNSs, the effect can be negligible.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4483045","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
Ultrafast Variability of Line Profiles in Spectra of γ Ori γ Ori光谱中谱线的超快变率
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09769-z
A. F. Kholtygin, V. B. Puzin, I. V. Sokolov, M. S. Kurdoyakova
{"title":"Ultrafast Variability of Line Profiles in Spectra of γ Ori","authors":"A. F. Kholtygin,&nbsp;V. B. Puzin,&nbsp;I. V. Sokolov,&nbsp;M. S. Kurdoyakova","doi":"10.1007/s10511-023-09769-z","DOIUrl":"10.1007/s10511-023-09769-z","url":null,"abstract":"<div><div><p>High time-resolution (∆T~2 min) observations of the B2V star γ Ori on the 2-m telescope at the Terskol Peak Observatory are presented. Regular components of line profile variations with periods from ~57 min to ~130 min are recorded. The nature of these variations is discussed.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784419","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
Herbig-Haro Flows and Young Stars in the Dobashi 5006 Dark Cloud Dobashi 5006黑云中的赫比格-哈罗流和年轻恒星
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09770-6
T. A. Movsessian, T. Yu. Magakian, A. S. Rastorguev, H. R. Andreasyan
{"title":"Herbig-Haro Flows and Young Stars in the Dobashi 5006 Dark Cloud","authors":"T. A. Movsessian,&nbsp;T. Yu. Magakian,&nbsp;A. S. Rastorguev,&nbsp;H. R. Andreasyan","doi":"10.1007/s10511-023-09770-6","DOIUrl":"10.1007/s10511-023-09770-6","url":null,"abstract":"<div><div><p>Two new Herbig-Haro flows were found in a study of the isolated Dobashi 5006 dark cloud (l = 216°.7, b = –13°.9): one certain (HH 1179) and one presumable, associated with the infrared sources 2MASS 06082284-0936139 and 2MASS 06081525-0933490, correspondingly. Judging from their spectral energy distributions, these sources may be Class 1 objects with luminosities of order 23 L<sub>⨀</sub> and 3.6 L<sub>⨀</sub>, respectively. They are part of the poor star cluster MWSC 0739, study of which based on data from the Gaia DR3 survey has made it possible to detect 17 stars which are probably members of it. A list of them and their main parameters is given. The distance of the cluster is estimated to be 820 pc and the color excess on the path to the cluster is E(BP - RP) ≈ 1.05 mag. All of these stars are PMS-objects and most of them are optically variable. It is concluded that the newly discovered compact star-formation zone in the Dobashi 5006 cloud has an age of no more than a few million years and this process continues up to the present time.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484623","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
The Study of Kantowski-Sachs Perfect Fluid Cosmological Model in Modified Gravity 修正重力下Kantowski-Sachs完美流体宇宙学模型的研究
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09771-5
T. Vinutha, K. Niharika, K. S. Kavya
{"title":"The Study of Kantowski-Sachs Perfect Fluid Cosmological Model in Modified Gravity","authors":"T. Vinutha,&nbsp;K. Niharika,&nbsp;K. S. Kavya","doi":"10.1007/s10511-023-09771-5","DOIUrl":"10.1007/s10511-023-09771-5","url":null,"abstract":"<div><div><p>Kantowski-Sachs perfect fluid cosmological model is explored in modified gravity with functional form <i>f</i> (<i>R</i>, <i>T</i>) = <i>f</i><sub>1</sub>(<i>R</i>) + <i>f</i><sub>2</sub> (<i>T</i>) where <i>R</i> is Ricci scalar and <i>T</i> is the trace of energymomentum tensor. With this functional form, three different cases have been formulated, namely negative and positive powers of curvature, logarithmic curvature and exponential curvature given by <i>f</i><sub>1</sub> (<i>R</i>) = <i>R</i> + γ <i>R</i><sup>2</sup> – μ<sup>4</sup> / <i>R</i>, <i>f</i><sub>1</sub>(<i>R</i>) = <i>R</i>+ <i>v</i> ln(τ<i>R</i>) and <i>f</i><sub>1</sub>(<i>R</i>) = <i>R</i>+ κ<i>e</i><sup>–ι<i>R</i></sup> respectively, and for all these three cases, <i>f</i><sub>2</sub> (<i>T</i>) = λ<i>T</i>, here γ,λ,μ,<i>v</i>,τ,κ and ι are constants. While solving the field equations, two constraints i) Expansion scalar is proportional to shear scalar ii) Hyperbolic scale factor are used. By using these conditions the required optimum solutions are obtained. The physical parameters are calculated and geometrical parameters of three cases are analysed against redshift z with the help of pictorial representation. In the context of <i>f</i> (R, T) gravity energy conditions are discussed with the help of pressure and energy density. If strong energy condition is positive the gravity should be attractive but in our model it is negative. It means that cosmic acceleration is due to antigravity, whereas NEC and DEC are fulfilled. The perturbation technique is used to test the stability of the background solutions of the obtained models. The inferences obtained from this paper are in persistent with the present cosmological observations and the model represents an accelerating universe.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484854","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: 1
Effect of Neutrino Oscillations on the Thermodynamic Properties of Hot Quark Matter 中微子振荡对热夸克物质热力学性质的影响
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09775-1
G. B. Alaverdyan, G. S. Hajyan, A. G. Alaverdyan
{"title":"Effect of Neutrino Oscillations on the Thermodynamic Properties of Hot Quark Matter","authors":"G. B. Alaverdyan,&nbsp;G. S. Hajyan,&nbsp;A. G. Alaverdyan","doi":"10.1007/s10511-023-09775-1","DOIUrl":"10.1007/s10511-023-09775-1","url":null,"abstract":"<div><div><p>The effect of neutrino oscillations on the thermodynamic characteristics of three-flavor hot quark matter in β-equilibrium that is opaque for neutrinos is examined in terms of the local SU(3) Nambu-Jona-Lasinio (NJL) model which also accounts for the ‘t Hooft interaction that leads to quark flavor mixing. The thermodynamic characteristics of quark matter are determined for two temperatures, T = 60 and 100 MeV, with neutrino oscillations taken into account. These results are compared with those obtained without taking neutrino oscillations into account. The calculations show that during cooling of quark matter that is opaque to neutrinos, the energy released per unit of baryon charge is 150 ÷ 350 MeV.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484852","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
Optical Classification of BZG Objects from the BZCAT Blazar Catalog BZCAT Blazar星表中BZG天体的光学分类
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09767-1
H. V. Abrahamyan, A. M. Mickaelian, G. M. Paronyan, G. A. Mikayelyan, A. G. Sukiasyan
{"title":"Optical Classification of BZG Objects from the BZCAT Blazar Catalog","authors":"H. V. Abrahamyan,&nbsp;A. M. Mickaelian,&nbsp;G. M. Paronyan,&nbsp;G. A. Mikayelyan,&nbsp;A. G. Sukiasyan","doi":"10.1007/s10511-023-09767-1","DOIUrl":"10.1007/s10511-023-09767-1","url":null,"abstract":"<div><div><p>In the blazar catalog BZCAT the objects are divided into 4 types: BZB, BZQ, BZG, and BZU. In this paper BZG objects are studied in order to determine their physical nature. Of the 274 BZG objects, 150 have optical spectra in the SDSS spectroscopic catalog, for which a detailed spectral classification has been carried out. A radio study showed that these objects mostly (69%) have a flat radio spectrum with a spectral index less than ±0.5. Quasars predominate among these kinds of radio spectra. However, with increasing distance, on the average the radio spectrum becomes steeper.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4484851","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: 2
Distances to 10 Nearby Galaxies Observed with the Hubble Space Telescope 哈勃太空望远镜观测到的10个邻近星系的距离
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09766-2
I. D. Karachentsev, N. A. Tikhonov
{"title":"Distances to 10 Nearby Galaxies Observed with the Hubble Space Telescope","authors":"I. D. Karachentsev,&nbsp;N. A. Tikhonov","doi":"10.1007/s10511-023-09766-2","DOIUrl":"10.1007/s10511-023-09766-2","url":null,"abstract":"<div><div><p>Images of 10 galaxies in F814W and F606W filters obtained on the Hubble Space Telescope (HST) are used to construct color-magnitude diagrams for the star population of these galaxies. The distances to the galaxies are estimated from the luminosity of the tip of the red giant branch. The galaxies examined here have radial velocities from 250 to 760 km/s relative to the centroid of the Local Group and distances ranging from 3.7 to 13.0 Mpc. Several other observed galaxies with low radial velocities are noted at distances beyond the limit of 13 Mpc.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784418","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: 2
Theory of Classical Gaseous Polytropes in an Integral Representation. I. Some General Results 积分表示中的经典气体多面体理论。一、一些一般结果
IF 0.5 4区 物理与天体物理
Astrophysics Pub Date : 2023-04-12 DOI: 10.1007/s10511-023-09776-0
G. A. Saiyan
{"title":"Theory of Classical Gaseous Polytropes in an Integral Representation. I. Some General Results","authors":"G. A. Saiyan","doi":"10.1007/s10511-023-09776-0","DOIUrl":"10.1007/s10511-023-09776-0","url":null,"abstract":"<div><div><p>The well known results of the theory of classical gaseous polytropes are presented in the framework of an integral approach where the standard Lane-Emden differential equation for a spherically symmetric gravitating mass is examined via its equivalent in the form of a nonlinear integral Volterra equation of the 2nd kind. It is shown that the inverse Laplace transform of the Lane-Emden equation for polytropes with an index of n=5 (Schuster model) is a recurrence relation for Bessel functions of the first kind. The invariance of the nonlinear integral Volterra equation with respect to homological transformations is shown, as well as the possibility of obtaining singular solutions under certain conditions. It is also shown that for whole integral and half integral polytrope indices, this equation is equivalent to a multidimensional integral equation, and finding the expansion of the Emden function in a power series of the dimensionless distance ξ from the center of the polytrope is equivalent to finding the Neumann series and the iterated nuclei in the Fredholm theory. Approximations of the Emden functions in closed form and their applicability to various astrophysical objects will be presented and discussed in the second part of this paper. Polytropes of other geometries and dimensionalities are not considered here.</p></div></div>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4784420","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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