Inhaled particles最新文献_第4页

Is the Universe Anisotropic Right Now? Comparing the Real Universe with the Kasner’s Space-Time 宇宙现在是各向异性的吗?真实宇宙与卡斯纳时空的比较

Inhaled particles Pub Date : 2023-05-04 DOI: 10.3390/particles6030052

Serge Parnovsky

{"title":"Is the Universe Anisotropic Right Now? Comparing the Real Universe with the Kasner’s Space-Time","authors":"Serge Parnovsky","doi":"10.3390/particles6030052","DOIUrl":"https://doi.org/10.3390/particles6030052","url":null,"abstract":"We investigate possible astronomical manifestations of space-time anisotropy. The homogeneous vacuum Kasner solution was chosen as a reference anisotropic cosmological model because there are no effects caused by inhomogeneity in this simple model with a constant degree of anisotropy. This anisotropy cannot become weak. The study of its geodesic structure made it possible to clarify the properties of this space-time. It showed that the degree of manifestation of anisotropy varies significantly depending on the travel time of the light from the observed object. For nearby objects, for which it does not exceed half the age of the universe, the manifestations of anisotropy are very small. Distant objects show more pronounced manifestations; for example, in the distribution of objects over the sky and over photometric distances. These effects for each of the individual objects decrease with time but, in general, the manifestations of anisotropy in the Kasner space-time remain constant due to the fact that new sources come from beyond the cosmological horizon. We analyze observable signatures of the Kasner-type anisotropy and compare it to observations. These effects were not found in astronomical observations, including the study of the CMB. We can assume that the Universe has always been isotropic or almost isotropic since the recombination era. This does not exclude the possibility of its significant anisotropy at the moment of the Big Bang followed by rapid isotropization during the inflationary epoch.","PeriodicalId":75932,"journal":{"name":"Inhaled particles","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90249031","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

Probing the Hot QCD Matter via Quarkonia at the Next-Generation Heavy-Ion Experiment at LHC 在大型强子对撞机的下一代重离子实验中用夸克子探测热QCD物质

Inhaled particles Pub Date : 2023-05-02 DOI: 10.3390/particles6020030

Y. Kharlov, Yeghishe Hambardzumyan, A. Varlamov

引用次数: 0

Several Topics on Transverse Momentum-Dependent Fragmentation Functions 关于横向动量相关破碎函数的几个问题

Inhaled particles Pub Date : 2023-04-27 DOI: 10.3390/particles6020029

Kai-bao Chen, Tianbo Liu, Yu-kun Song, Shu-yi Wei

{"title":"Several Topics on Transverse Momentum-Dependent Fragmentation Functions","authors":"Kai-bao Chen, Tianbo Liu, Yu-kun Song, Shu-yi Wei","doi":"10.3390/particles6020029","DOIUrl":"https://doi.org/10.3390/particles6020029","url":null,"abstract":"The hadronization of a high-energy parton is described by fragmentation functions which are introduced through QCD factorizations. While the hadronization mechanism per se remains uknown, fragmentation functions can still be investigated qualitatively and quantitatively. The qualitative study mainly concentrates on extracting genuine features based on the operator definition in quantum field theory. The quantitative research focuses on describing a variety of experimental data employing the fragmentation function given by the parameterizations or model calculations. With the foundation of the transverse-momentum-dependent factorization, the QCD evolution of leading twist transverse-momentum-dependent fragmentation functions has also been established. In addition, the universality of fragmentation functions has been proven, albeit model-dependently, so that it is possible to perform a global analysis of experimental data in different high-energy reactions. The collective efforts may eventually reveal important information hidden in the shadow of nonperturbative physics. This review covers the following topics: transverse-momentum-dependent factorization and the corresponding QCD evolution, spin-dependent fragmentation functions at leading and higher twists, several experimental measurements and corresponding phenomenological studies, and some model calculations.","PeriodicalId":75932,"journal":{"name":"Inhaled particles","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85729178","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

Centrality Selection Effect on Elliptic Flow Measurements in Relativistic Heavy-Ion Collisions at NICA Energies NICA能量下相对论重离子碰撞椭圆流测量的中心性选择效应

Inhaled particles Pub Date : 2023-04-26 DOI: 10.3390/particles6020028

D. Idrisov, P. Parfenov, A. Taranenko

引用次数: 0

A Monte Carlo Study of Hyperon Production with the MPD and BM@N Experiments at NICA 用MPD产生超子的蒙特卡罗研究和在NICA的BM@N实验

Inhaled particles Pub Date : 2023-04-18 DOI: 10.3390/particles6020027

A. Zinchenko, M. Kapishin, V. Kireyeu, V. Kolesnikov, A. Mudrokh, Dilyana Suvarieva, V. Vasendina, D. Zinchenko

引用次数: 0

Light-Nuclei Production in Heavy-Ion Collisions at sNN = 6.4 – 19.6 GeV in THESEUS Generator Based on Three-Fluid Dynamics 基于三流体动力学的THESEUS发生器sNN = 6.4 ~ 19.6 GeV重离子碰撞轻核产生

Inhaled particles Pub Date : 2023-03-16 DOI: 10.3390/particles6010024

M. Kozhevnikova, Y. Ivanov

引用次数: 0

Future of Neutron Star Studies with Fast Radio Bursts 用快速射电暴研究中子星的未来

Inhaled particles Pub Date : 2023-03-09 DOI: 10.3390/particles6010025

S. Popov, M. Pshirkov

引用次数: 1

An Improved Core-Corona Model for Λ and Λ Polarization in Relativistic Heavy-Ion Collisions 相对论性重离子碰撞中Λ和Λ极化的改进核-电晕模型

Inhaled particles Pub Date : 2023-03-03 DOI: 10.3390/particles6010022

A. Ayala, I. Dominguez, I. Maldonado, M. Tejeda-Yeomans

{"title":"An Improved Core-Corona Model for Λ and Λ Polarization in Relativistic Heavy-Ion Collisions","authors":"A. Ayala, I. Dominguez, I. Maldonado, M. Tejeda-Yeomans","doi":"10.3390/particles6010022","DOIUrl":"https://doi.org/10.3390/particles6010022","url":null,"abstract":"Due to its sensitivity to the dynamics of strongly interacting matter subject to extreme conditions, hyperon global polarization has become an important observable to study the system created in relativistic heavy-ion collisions. Recently, the STAR and HADES collaborations have measured the global polarization of both Λ and Λ¯ produced in semi-central collisions in a wide range of collision energies. The polarization excitation functions show an increasing trend as the collision energy decreases, with the increase being more pronounced for the Λ¯. In this work, we make a summary of a core-corona model that we have developed to quantify the global polarization contributions from Λ and Λ¯ created in different regions of the fireball. The core-corona model assumes that Λs and Λ¯s are produced in both regions, the high-density core and the lower density corona, with different relative abundances which modulate the polarization excitation function. We have shown that the model works well for the description of experimental results. The global polarization excitation functions computed with the model show a peak at different collision energies in the region sNN≤10 GeV. Finally, we discuss and report on the model global polarization predictions for BES-II, NICA and CBM at FAIR and HADES energies.","PeriodicalId":75932,"journal":{"name":"Inhaled particles","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75679361","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

Precision Storage Rings for Electric Dipole Moment Searches: A Tool En Route to Physics Beyond-the-Standard-Model 电偶极矩搜索的精密存储环:一种超越标准模型的物理工具

Inhaled particles Pub Date : 2023-03-02 DOI: 10.3390/particles6010020

H. Ströher, S. Schmidt, P. Lenisa, J. Pretz

引用次数: 0

Prospects for the (Hyper)Nuclei Study in the Nica Energy Range Nica能谱(超)核研究的展望

Inhaled particles Pub Date : 2023-03-02 DOI: 10.3390/particles6010021

V. Kireyeu, V. Kolesnikov, A. Zinchenko, V. Vasendina, A. Mudrokh

引用次数: 0