Dark radiation constraints on portal interactions with hidden sectors
Dark radiation constraints on portal interactions with hidden sectors
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暗辐射对门户与隐藏扇区交互的限制
DOI：
10.1088/1475-7516/2022/09/056
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发表时间：
2022
影响因子：
6.4
通讯作者：
J. Shelton
中科院分区：
文献类型：
--
作者：
Peter Adshead;Pranjal Ralegankar;J. Shelton
我们更新了对带电粒子（MCP）的暗辐射约束和标准模型（SM）的测量重子数-轻子数（B-L）扩展。在这些模型中，一个巨大的SM测量单重态介质将SM等离子体与附加的SM单重态光自由度耦合在一起。在早期的宇宙中，这些新的光粒子通过SM与MCP或新的B-L规范玻色子的相互作用而填充，并充当暗辐射。早期宇宙中暗辐射的存在受到当前和即将到来的宇宙微波背景（CMB）测量的严格限制。我们从当前的neff测量中更新了MCP的界限，并表明未来的CMB实验将能够排除或发现用于解释EDGES异常的扩展MCP模型。我们对测量的B-L模型的分析超越了以前的研究，包括量子统计和非平衡效应。此外，我们解释了B-L规范玻色子的有限寿命，它提高了随后的右手中微子能量密度。我们也发展了一些近似和技术来简化和解决相关的玻尔兹曼方程。如果介质与隐藏扇区的相互作用比与SM的相互作用更强烈，那么我们使用我们的近似来开发具有对隐藏扇区细节不敏感的光遗迹的一般隐藏扇区的辐射密度的下界。
We update dark radiation constraints on millicharged particle (MCP) and gauged baryon-number-minus-lepton-number (B-L) extensions of the Standard Model (SM). In these models, a massive SM gauge singlet mediator couples the SM plasma to additional SM-singlet light degrees of freedom. In the early Universe, these new light particles are populated via the interaction of the SM with the MCP, or the new B-L gauge boson, and act as dark radiation. The presence of dark radiation in the early Universe is tightly constrained by current and upcoming cosmic microwave background (CMB) measurements. We update bounds on MCPs from current measurements of N eff and show that future CMB experiments will be able to rule out or discover the extended MCP model invoked to explain the EDGES anomaly. Our analysis of the gauged B-L model goes beyond previous studies by including quantum-statistical and out-of-equilibrium effects. Further, we account for the finite lifetime of the B-L gauge boson, which boosts the subsequent right-handed neutrino energy density. We also develop a number of approximations and techniques for simplifying and solving the relevant Boltzmann equations. We use our approximations to develop a lower bound on the radiation density in a generic hidden sector with a light relic that is insensitive to the details of the hidden sector, provided the mediator interacts more strongly with the hidden sector than with the SM.
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影响因子：
5.5
作者：
J. Berryman;N. Blinov;V. Brdar;T. Brinckmann;M. Bustamante;F. Cyr-Racine;A. Das;A. Gouvea;P. Denton;P. Dev;B. Dutta;I. Esteban;D. Fiorillo;M. Gerbino;Subhajit Ghosh;T. Ghosh;E. Grohs;T. Han;S. Hannestad;M. Hostert;P. Huber;J. Hyde;K. Kelly;F. Kling;Zhen Liu;M. Lattanzi;M. Loverde;Sujata Pandey;N. Saviano;M. Sen;I. Shoemaker;Walter Tangarife;Yongchao Zhang;Yue Zhang
通讯作者：
J. Berryman;N. Blinov;V. Brdar;T. Brinckmann;M. Bustamante;F. Cyr-Racine;A. Das;A. Gouvea;P. Denton;P. Dev;B. Dutta;I. Esteban;D. Fiorillo;M. Gerbino;Subhajit Ghosh;T. Ghosh;E. Grohs;T. Han;S. Hannestad;M. Hostert;P. Huber;J. Hyde;K. Kelly;F. Kling;Zhen Liu;M. Lattanzi;M. Loverde;Sujata Pandey;N. Saviano;M. Sen;I. Shoemaker;Walter Tangarife;Yongchao Zhang;Yue Zhang
EDGES异常的复合解决方案
影响因子：
5
作者：
Mathur, Anubhav;Rajendran, Surjeet;Ramani, Harikrishnan
通讯作者：
Ramani, Harikrishnan
影响因子：
5
作者：
K. Abazajian;J. Heeck
通讯作者：
K. Abazajian;J. Heeck
DOI：
--
发表时间：
2019-07
期刊：
arXiv: Instrumentation and Methods for Astrophysics
影响因子：
--
作者：
K. Abazajian;G. Addison;Peter Adshead;Z. Ahmed;S. Allen;D. Alonso;M. Alvarez;A. Anderson;K. Arno
通讯作者：
K. Abazajian;G. Addison;Peter Adshead;Z. Ahmed;S. Allen;D. Alonso;M. Alvarez;A. Anderson;K. Arno