arXiv: Cosmology and Nongalactic Astrophysics最新文献

Primordial Black Holes: from Theory to Gravitational Wave Observations 太初黑洞:从理论到引力波观测

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-10-13 DOI: 10.13097/ARCHIVE-OUVERTE/UNIGE:156136

G. Franciolini

引用次数: 27

Chasing the Tail of Cosmic Reionization with Dark Gap Statistics in the Ly$α$ Forest over $5 < z < 6$ 在$5 < z < 6$的Ly$α$森林中用暗隙统计追踪宇宙再电离的尾巴

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-09-13 DOI: 10.17863/CAM.75772

Yongda Zhu, G. Becker, S. Bosman, L. Keating, H. Christenson, E. Bañados, F. Bian, F. Davies, V. D’Odorico, A. Eilers, Xiaohui Fan, M. Haehnelt, Girish Kulkarni, A. Pallottini, Y. Qin, Feige Wang, Jinyi Yang

{"title":"Chasing the Tail of Cosmic Reionization with Dark Gap Statistics in the Ly$α$ Forest over $5 < z < 6$","authors":"Yongda Zhu, G. Becker, S. Bosman, L. Keating, H. Christenson, E. Bañados, F. Bian, F. Davies, V. D’Odorico, A. Eilers, Xiaohui Fan, M. Haehnelt, Girish Kulkarni, A. Pallottini, Y. Qin, Feige Wang, Jinyi Yang","doi":"10.17863/CAM.75772","DOIUrl":"https://doi.org/10.17863/CAM.75772","url":null,"abstract":"We present a new investigation of the intergalactic medium (IGM) near the end of reionization using \"dark gaps\" in the Lyman-alpha (Ly$alpha$) forest. Using spectra of 55 QSOs at $z_{rm em}>5.5$, including new data from the XQR-30 VLT Large Programme, we identify gaps in the Ly$alpha$ forest where the transmission averaged over 1 comoving $h^{-1},{rm Mpc}$ bins falls below 5%. Nine ultra-long ($L > 80~h^{-1},{rm Mpc}$) dark gaps are identified at $z<6$. In addition, we quantify the fraction of QSO spectra exhibiting gaps longer than $30~h^{-1},{rm Mpc}$, $F_{30}$, as a function of redshift. We measure $F_{30} simeq 0.9$, 0.6, and 0.15 at $z = 6.0$, 5.8, and 5.6, respectively, with the last of these long dark gaps persisting down to $z simeq 5.3$. Comparing our results with predictions from hydrodynamical simulations, we find that the data are consistent with models wherein reionization extends significantly below redshift six. Models wherein the IGM is essentially fully reionized that retain large-scale fluctuations in the ionizing UV background at $z lesssim 6$ are also potentially consistent with the data. Overall, our results suggest that signature of reionization in the form of islands of neutral hydrogen and/or large-scale fluctuations in the ionizing background remain present in the IGM until at least $z simeq 5.3$.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79916241","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

Towards an Optimal Estimation of Cosmological Parameters with the Wavelet Scattering Transform 用小波散射变换对宇宙学参数的最优估计

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-08-17 DOI: 10.1103/PhysRevD.105.103534

Georgios Valogiannis, C. Dvorkin

{"title":"Towards an Optimal Estimation of Cosmological Parameters with the Wavelet Scattering Transform","authors":"Georgios Valogiannis, C. Dvorkin","doi":"10.1103/PhysRevD.105.103534","DOIUrl":"https://doi.org/10.1103/PhysRevD.105.103534","url":null,"abstract":"Optimal extraction of the non-Gaussian information encoded in the Large-Scale Structure (LSS) of the universe lies at the forefront of modern precision cosmology. We propose achieving this task through the use of the Wavelet Scattering Transform (WST), which subjects an input field to a layer of non-linear transformations that are sensitive to non-Gaussianity in spatial density distributions through a generated set of WST coefficients. In order to assess its applicability in the context of LSS surveys, we apply the WST on the 3D overdensity field obtained by the Quijote simulations, out of which we extract the Fisher information in 6 cosmological parameters. It is subsequently found to deliver a large improvement in the marginalized errors on all parameters, ranging between $1.2-4times$ tighter than the corresponding ones obtained from the regular 3D cold dark matter + baryon power spectrum, as well as a $50 %$ improvement over the neutrino mass constraint given by the marked power spectrum. Through this first application on 3D cosmological fields, we demonstrate the great promise held by this novel statistic and set the stage for its future application to actual galaxy observations.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86467955","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: 23

Hubble tension and absolute constraints on the local Hubble parameter. 哈勃张力和局部哈勃参数的绝对约束。

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-08-17 DOI: 10.1051/0004-6361/202141736

V. Gurzadyan, A. Stepanian

引用次数: 10

Assessment of the cosmic distance duality relation using Gaussian process 用高斯过程评价宇宙距离对偶关系

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-04-13 DOI: 10.1093/mnras/stab1054

P. Mukherjee, Ankan Mukherjee

引用次数: 12

Search for topological defect dark matter using the global network of optical magnetometers for exotic physics searches (GNOME) 利用全球奇异物理搜索光磁力计网络(GNOME)搜索拓扑缺陷暗物质

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-04-07 DOI: 10.21203/RS.3.RS-298059/V1

S. Afach, B. Buchler, D. Budker, C. Dailey, A. Derevianko, V. Dumont, N. L. Figueroa, I. Gerhardt, Z. Gruji'c, Hong Guo, Chuanpeng Hao, P. Hamilton, M. Hedges, D. F. Kimball, Dongok Kim, Sami Khamis, T. Kornack, V. Lebedev, Zheng‐Tian Lu, H. Masia-Roig, M. Monroy, M. Padniuk, C. Palm, Sun Yool Park, Karun V. Paul, A. Penaflor, Xiang Peng, M. Pospelov, Rayshaun Preston, S. Pustelny, T. Scholtes, P. Segura, Y. Semertzidis, D. Sheng, Y. Shin, Joseph A. Smiga, J. Stalnaker, I. Sulai, Dhruv Tandon, Tao Wang, A. Weis, A. Wickenbrock, T. Wilson, Teng Wu, D. Wurm, Wei Xiao, Yucheng Yang, Dongrui Yu, Jianwei Zhang

{"title":"Search for topological defect dark matter using the global network of optical magnetometers for exotic physics searches (GNOME)","authors":"S. Afach, B. Buchler, D. Budker, C. Dailey, A. Derevianko, V. Dumont, N. L. Figueroa, I. Gerhardt, Z. Gruji'c, Hong Guo, Chuanpeng Hao, P. Hamilton, M. Hedges, D. F. Kimball, Dongok Kim, Sami Khamis, T. Kornack, V. Lebedev, Zheng‐Tian Lu, H. Masia-Roig, M. Monroy, M. Padniuk, C. Palm, Sun Yool Park, Karun V. Paul, A. Penaflor, Xiang Peng, M. Pospelov, Rayshaun Preston, S. Pustelny, T. Scholtes, P. Segura, Y. Semertzidis, D. Sheng, Y. Shin, Joseph A. Smiga, J. Stalnaker, I. Sulai, Dhruv Tandon, Tao Wang, A. Weis, A. Wickenbrock, T. Wilson, Teng Wu, D. Wurm, Wei Xiao, Yucheng Yang, Dongrui Yu, Jianwei Zhang","doi":"10.21203/RS.3.RS-298059/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-298059/V1","url":null,"abstract":"\u0000 Results are reported from the first full-scale search for transient signals from exotic fields of astrophysical origin using data from a newly constructed Earth-scale detector: the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). Data collected by the GNOME consist of correlated measurements from optical atomic magnetometers located in laboratories all over the world. GNOME data are searched for patterns of signals propagating through the network consistent with exotic fields composed of ultralight bosons such as axion-like particles (ALPs). Analysis of data from a continuous month-long operation of the GNOME finds no statistically significant signals consistent with those expected due to encounters with topological defects (axion domain walls), placing new experimental constraints on such dark matter scenarios.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81829045","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: 12

Using the sample variance of 21cm maps as a tracer of the ionisation topology 使用21cm图的样本方差作为电离拓扑的示踪剂

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-02-08 DOI: 10.1051/0004-6361/202140515

A. Gorce, A. Hutter, J. Pritchard

{"title":"Using the sample variance of 21cm maps as a tracer of the ionisation topology","authors":"A. Gorce, A. Hutter, J. Pritchard","doi":"10.1051/0004-6361/202140515","DOIUrl":"https://doi.org/10.1051/0004-6361/202140515","url":null,"abstract":"Intensity mapping of the 21cm signal of neutral hydrogen will yield exciting insights into the Epoch of Reionisation and the nature of the first galaxies. However, the large amount of data that will be generated by the next generation of radio telescopes, such as the Square Kilometre Array (SKA), as well as the numerous observational obstacles to overcome, require analysis techniques tuned to extract the reionisation history and morphology. In this context, we introduce a one-point statistic, to which we refer as the local variance, $sigma_mathrm{loc}$, that describes the distribution of the mean differential 21cm brightness temperatures measured in two-dimensional maps along the frequency direction of a light-cone. The local variance takes advantage of what is usually considered an observational bias, the sample variance. We find the redshift-evolution of the local variance to not only probe the reionisation history of the observed patches of the sky, but also trace the ionisation morphology. This estimator provides a promising tool to constrain the midpoint of reionisation as well as gaining insight into the ionising properties of early galaxies.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85568577","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

On the use of the local prior on the absolute magnitude of Type Ia supernovae in cosmological inference Ia型超新星绝对星等的局部先验在宇宙学推断中的应用

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2021-01-21 DOI: 10.1093/mnras/stab1200

D. Camarena, V. Marra

{"title":"On the use of the local prior on the absolute magnitude of Type Ia supernovae in cosmological inference","authors":"D. Camarena, V. Marra","doi":"10.1093/mnras/stab1200","DOIUrl":"https://doi.org/10.1093/mnras/stab1200","url":null,"abstract":"A dark-energy which behaves as the cosmological constant until a sudden phantom transition at very-low redshift ($z 4$sigma$ disagreement between the local and high-redshift determinations of the Hubble constant, while maintaining the phenomenological success of the $Lambda$CDM model with respect to the other observables. Here, we show that such a hockey-stick dark energy cannot solve the $H_0$ crisis. The basic reason is that the supernova absolute magnitude $M_B$ that is used to derive the local $H_0$ constraint is not compatible with the $M_B$ that is necessary to fit supernova, BAO and CMB data, and this disagreement is not solved by a sudden phantom transition at very-low redshift. We make use of this example to show why it is preferable to adopt in the statistical analyses the prior on $M_B$ as an alternative to the prior on $H_0$. The three reasons are: i) one avoids potential double counting of low-redshift supernovae, ii) one avoids assuming the validity of cosmography, in particular fixing the deceleration parameter to the standard model value $q_0=-0.55$, iii) one includes in the analysis the fact that $M_B$ is constrained by local calibration, an information which would otherwise be neglected in the analysis, biasing both model selection and parameter constraints. We provide the priors on $M_B$ relative to the recent Pantheon and DES-SN3YR supernova catalogs. We also provide a Gaussian joint prior on $H_0$ and $q_0$ that generalizes the prior on $H_0$ by SH0ES.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90216406","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: 120

Cosmology without window functions: Quadratic estimators for the galaxy power spectrum 无窗函数的宇宙学:星系功率谱的二次估计

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-12-17 DOI: 10.1103/PhysRevD.103.103504

O. Philcox

{"title":"Cosmology without window functions: Quadratic estimators for the galaxy power spectrum","authors":"O. Philcox","doi":"10.1103/PhysRevD.103.103504","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.103504","url":null,"abstract":"Conventional algorithms for galaxy power spectrum estimation measure the true spectrum convolved with a survey window function, which, for parameter inference, must be compared with a similarly convolved theory model. In this work, we directly estimate the unwindowed power spectrum multipoles using quadratic estimators akin to those introduced in the late 1990s. Under Gaussian assumptions, these are optimal and free from the leading-order effects of pixellization and non-Poissonian shot-noise. They may be straightforwardly computed given the survey data-set and a suite of simulations of known cosmology. We implement the pixel-based maximum-likelihood estimator and a simplification based on the FKP weighting scheme, both of which can be computed via FFTs and conjugate gradient descent methods. Furthermore, the estimators allow direct computation of spectrum coefficients in an arbitrary linear compression scheme, without needing to first bin the statistico. Applying the technique to a subset of the BOSS DR12 galaxies, we find that the pixel-based quadratic estimators give statistically consistent power spectra, compressed coefficients, and cosmological parameters to those obtained with the usual windowed approaches. Due to the sample's low number density and compact window function, the optimal weighting scheme gives little improvement over the simplified form; this may change for dense surveys or those focusing on primordial non-Gaussianity. The technique is shown to be efficient and robust, and shows significant potential for measuring the windowless power spectrum and bispectrum in the presence of weak non-Gaussianity.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76354076","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: 23

Do the observational data favor a local void? 观测数据支持局部空洞吗?

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-12-15 DOI: 10.1103/PhysRevD.103.123539

R. Cai, Jiajian Ding, Zongkuan Guo, Shao-Jiang Wang, Wang-Wei Yu

引用次数: 11