Astronomische Nachrichten最新文献

{"title":"Issue Information: Astron. Nachr. 7/2025","authors":"","doi":"10.1002/asna.70051","DOIUrl":"https://doi.org/10.1002/asna.70051","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135662","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}

{"title":"Cover Picture: Astron. Nachr. 7/2025","authors":"","doi":"10.1002/asna.70052","DOIUrl":"https://doi.org/10.1002/asna.70052","url":null,"abstract":"<p>Rendering of China's first X-ray astronomy satellite, the Hard X-ray Modulation Telescope (HXMT), known as Insight-HXMT. Launched on June 15, 2017, Insight-HXMT is a broadband X-ray astronomy satellite, covering 1–250 keV, with additional sky-scanning capability at 0.2–3 MeV. Designed to perform pointing, scanning, and gamma-ray burst (GRB) observations based on the Direct Demodulation Method (DDM), its observation data have served as the source for several of the research highlights presented in this Special Issue. Image source: Institute of High Energy Physics, Chinese Academy of Sciences (https://doi.org/10.1093/nsr/nwx141); reproduced with permission.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135663","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}

{"title":"Preface to the Special Issue—Reviews (IWARA 2024)","authors":"César Augusto Zen Vasconcellos,&nbsp;Peter Hess,&nbsp;Fridolin Weber,&nbsp;Remo Ruffini,&nbsp;Jorge Horvath,&nbsp;Zhifu Gao,&nbsp;Dimiter Hadjimichef,&nbsp;Benno Bodmann","doi":"10.1002/asna.70048","DOIUrl":"https://doi.org/10.1002/asna.70048","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135392","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}

{"title":"Cosmic Inflation in an Extended Noncommutative Foliated Quantum Gravity: Friedmann-Type Dynamical Equations","authors":"Peter O. Hess,&nbsp;César A. Zen Vasconcellos,&nbsp;José de Freitas Pacheco,&nbsp;Fridolin Weber,&nbsp;Remo Ruffini,&nbsp;Dimiter Hadjimichef,&nbsp;Moisés Razeira,&nbsp;Benno Bodmann,&nbsp;Marcelo Netz-Marzola,&nbsp;Geovane Naysinger,&nbsp;Rodrigo Fraga da Silva,&nbsp;João G. G. Gimenez","doi":"10.1002/asna.70046","DOIUrl":"https://doi.org/10.1002/asna.70046","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel approach to cosmic inflation within the framework of a noncommutative Riemannian foliated quantum gravity, built upon a reverse Faddeev–Jackiw symplectic spacetime deformation of the conventional Poisson algebra, is investigated. Friedmann-type dynamical equations, analytically continued to a complex noncommutative framework, incorporate a modified energy-momentum Riemann tensor and a noncommutative matter-energy potential, highlighting the emergence of quantum gravity topological fluctuation effects on the expansion dynamics of the universe. In this realm, the coupling of UV and IR scales plays a central role, providing a natural topological mechanism for inflation and recursal evidence for the generation of relic gravitational waves. These predictions align with a self-consistent description of the transition between the primordial mirror-universe deceleration and present-universe acceleration phases as predicted by the Riemann foliated quantum gravity, offering potential connections to observational cosmology.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135474","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}

{"title":"On the Theoretical Properties and Experimental Detection of Dark Matter Axions","authors":"Zhi-Fu Gao,&nbsp;Biao-Peng Li,&nbsp;Luiz C. Garcia de Andrade,&nbsp;Xiao-Feng Yang","doi":"10.1002/asna.70031","DOIUrl":"https://doi.org/10.1002/asna.70031","url":null,"abstract":"<div>\u0000 \u0000 <p>Dark matter constitutes approximately <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mn>27</mn>\u0000 <mo>%</mo>\u0000 </mrow>\u0000 <annotation>$$ 27% $$</annotation>\u0000 </semantics></math> of the universe's total matter-energy content, yet its fundamental nature remains unknown. Axions, initially proposed to solve the strong CP problem in quantum chromodynamics (QCD), emerge as leading dark matter candidates due to their attractive theoretical properties and compatibility with observational constraints. This paper explores the theoretical foundations of axions, their interactions with electromagnetic fields, and recent advancements in experimental detection methods. We provide an in-depth analysis of axion models, including the PQWW, KSVZ, DFSZ models, and axion-like particles (ALPs), highlighting their mass ranges, coupling strengths, and experimental implications. The potential for detecting axion dark matter via pulsar observations is also explored, offering a novel avenue to constrain axion parameter spaces. Finally, we discuss ongoing challenges and future research directions in axion physics, underscoring the transformative potential of axion detection for solving the dark matter puzzle and advancing fundamental physics.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135437","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}

{"title":"Cover Picture: Astron. Nachr. 6/2025","authors":"M. Scardia,&nbsp;J.-L. Prieur,&nbsp;J.-P. Rivet,&nbsp;D. Vernet,&nbsp;E. Aristidi,&nbsp;J. F. Ling,&nbsp;L. Piccotti,&nbsp;L. Pansecchi,&nbsp;R. W. Argyle,&nbsp;L. Abe,&nbsp;P. Bendjoya,&nbsp;L. Maccarini","doi":"10.1002/asna.70044","DOIUrl":"https://doi.org/10.1002/asna.70044","url":null,"abstract":"<p>New orbits of long period visual binary systems <i>A 1913AB</i>, P ≈ 3360 yr (a), <i>A 1710</i>, P ≈ 111 yr (b), <i>COU1394</i>, P ≈ 330 yr (c), <i>BU1185</i>, P ≈ 28 yr (d), <i>A 122</i>, P ≈ 103 yr (e), and <i>A 570</i>, P ≈ 30 yr (f). The observational data used for the calculation of the orbital elements are plotted as small green crosses or red dots, the latter indicating the new positions derived from observations with the Pupil Interferometry Speckle camera and Coronograph (PISCO) at Calern, France. For each object, the location of the primary component is indicated with a big cross; the dashed straight line going through this point is the apsidal line. This work is a valuable contribution to the continuing monitoring of long period visual binary systems, which is important for refining systemic stellar masses. For details see the paper by M. Scardia et al., e70000.\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843653","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}

{"title":"Issue Information: Astron. Nachr. 6/2025","authors":"","doi":"10.1002/asna.70045","DOIUrl":"https://doi.org/10.1002/asna.70045","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843654","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}

{"title":"On the Neutrino Radiation of Neutron Stars","authors":"Yong-Hong Li,&nbsp;Die Xu,&nbsp;Hui Wang","doi":"10.1002/asna.70038","DOIUrl":"https://doi.org/10.1002/asna.70038","url":null,"abstract":"<div>\u0000 \u0000 <p>The paper first meticulously analyzes the primary mechanisms of neutrino generation within neutron stars, namely the direct Urca process and the modified Urca process, elucidates the computational methods for neutrino radiation rates, including the physical mechanisms of weak interactions, applications of quantum field theory, and complex mathematical integration techniques. Additionally, it comprehensively investigates various critical factors affecting neutron star cooling processes, such as the inhibitory effect of superfluidity and superconductivity on neutrino emission rates, the anisotropic impact of strong magnetic fields on neutrino radiation, the modulating effect of baryon density on neutrino emission rates, and how these factors alter the cooling curves and observational characteristics of neutron stars. Finally, based on the existing research findings, the paper outlines future research directions in the field of neutron star thermal evolution, emphasizing the importance of enhancing the measurement accuracy of neutron star cooling curves, delving into neutrino radiation mechanisms under extreme physical conditions, and exploring potential new physical phenomena within neutron stars, such as quark matter. These studies will not only refine the physical models of neutron stars but also propel the broader field of astrophysics, offering new perspectives and insights into extreme physical conditions and fundamental interactions in the universe.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135490","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}

{"title":"Cosmic Inflation in an Extended Noncommutative Foliated Quantum Gravity: The Wave Function of the Universe","authors":"Peter O. Hess,&nbsp;César A. Zen Vasconcellos,&nbsp;José de Freitas Pacheco,&nbsp;Fridolin Weber,&nbsp;Remo Ruffini,&nbsp;Dimiter Hadjimichef,&nbsp;Moisés Razeira,&nbsp;Benno Bodmann,&nbsp;Marcelo Netz-Marzola,&nbsp;Geovane Naysinger,&nbsp;Rodrigo Fraga da Silva,&nbsp;João G. G. Gimenez","doi":"10.1002/asna.70039","DOIUrl":"https://doi.org/10.1002/asna.70039","url":null,"abstract":"<div>\u0000 \u0000 <p>We explore a noncommutative extension of branch-cut quantum gravity (BCQG), with a focus on its implications for early-universe inflation. Our framework builds on a three-field mini-superspace model involving a complex-valued cosmic-scale factor, a perfect-fluid field, and an inflaton-type scalar field. Using a Faddeev–Jackiw symplectic deformation of the conventional Poisson algebra, we construct a noncommutative phase space and derive a modified Wheeler–DeWitt equation. Analytic solutions to the wave function of the universe are obtained and analyzed. We show that noncommutativity induces coupling between ultraviolet and infrared modes, naturally leading to an inflationary phase without requiring fine-tuned initial conditions. This feature offers a novel alternative to standard inflationary models. We also discuss how the structure of the wave function in this framework may relate to primordial density perturbations. While some aspects of this theory remain speculative, the mathematical formulation provides a consistent path toward integrating quantum gravitational effects into early cosmological dynamics.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135441","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}

{"title":"Spectral Variations, Quiet Chromosphere and Flaring of Transition Region of AR Lac in UV and Gaia DR3 in the Field Open Cluster NGC 7209","authors":"Magdy R. Sanad,&nbsp;Yasser H. M. Hendy,&nbsp;Helal I. Abdel Rahman,&nbsp;Doaa Eid","doi":"10.1002/asna.70037","DOIUrl":"https://doi.org/10.1002/asna.70037","url":null,"abstract":"<div>\u0000 \u0000 <p>We present Gaia DR3 data and estimated the cluster radius, color-magnitude diagram and the membership probability of the open cluster NGC 7209 using the machine learning algorithm pyUPMASK. We evaluated the membership probability of the RS CVn eclipsing binary system AR Lac. We reported International Ultraviolet Explorer (IUE) observations during the period (1979–1994) of the RS CVn eclipsing binary system AR Lac to describe the spectral behavior and the physical conditions in its atmosphere. The observations reveal indications of flare activity in the transition region. Besides the flaring activity, the emission lines show a range of variations between high, intermediate, and low flux values. The relation between line fluxes and orbital phases is found. The flaring activity is found in 1979, 1990, and 1994. The reddening of AR Lac was estimated from the 2200 Å absorption feature to be <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>E</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mrow>\u0000 <mi>B</mi>\u0000 <mo>−</mo>\u0000 <mi>V</mi>\u0000 </mrow>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 <mo>=</mo>\u0000 <mn>0</mn>\u0000 </mrow>\u0000 <annotation>$$ Eleft(B-Vright)=0 $$</annotation>\u0000 </semantics></math>. The average mass loss rate is found to be <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>≈</mo>\u0000 <mn>3.2</mn>\u0000 <mo>×</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>9</mn>\u0000 </mrow>\u0000 </msup>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⊙</mo>\u0000 </msub>\u0000 <mspace></mspace>\u0000 <msup>\u0000 <mtext>year</mtext>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation>$$ approx 3.2times {10}^{-9}{M}_{odot}kern0.1em {mathrm{year}}^{-1} $$</annotation>\u0000 </semantics></math>, the average temperature of the emitting region is determined by using Planck's equation to be <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>≈</mo>\u0000 <mn>9.2</mn>\u0000 <mo>×</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mn>4</mn>\u0000 </msup>\u0000 <mspace></mspace>\u0000 <mi>K</mi>\u0000 </mrow>\u0000 <annotation>$$ approx 9.2times {10}^4;mathrm{K} $$</annotation>\u0000 </semantics></math>, the energy of","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843373","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}