arXiv: Cosmology and Nongalactic Astrophysics最新文献_第7页

Peculiar velocity estimation from kinetic SZ effect using deep neural networks 基于深度神经网络的动力学SZ效应奇异速度估计

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-10-08 DOI: 10.1093/mnras/stab1715

Yuyu Wang, Nesar Ramachandra, Edgar M. Salazar-Canizales, H. Feldman, R. Watkins, K. Dolag

引用次数: 0

Accounting for object detection bias in weak gravitational lensing studies 弱引力透镜研究中物体探测偏差的解释

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-10-08 DOI: 10.1051/0004-6361/202038998

H. Hoekstra, A. Kannawadi, T. Kitching

引用次数: 5

Primordial black holes and gravitational waves from resonant amplification during inflation 原始黑洞和膨胀期间共振放大产生的引力波

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-10-07 DOI: 10.1103/physrevd.102.103527

Zihan Zhou, Jie Jiang, Yi-Fu Cai, M. Sasaki, Shi Pi

引用次数: 51

Self-calibration of weak lensing systematic effects using combined two- and three-point statistics 结合两点和三点统计的弱透镜系统效应自校正

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-10-01 DOI: 10.1093/MNRAS/STAB413

Susan Pyne, B. Joachimi

{"title":"Self-calibration of weak lensing systematic effects using combined two- and three-point statistics","authors":"Susan Pyne, B. Joachimi","doi":"10.1093/MNRAS/STAB413","DOIUrl":"https://doi.org/10.1093/MNRAS/STAB413","url":null,"abstract":"We investigate the prospects for using the weak lensing bispectrum alongside the power spectrum to control systematic uncertainties in a Euclid-like survey. Three systematic effects are considered: the intrinsic alignment of galaxies, uncertainties in the means of tomographic redshift distributions, and multiplicative bias in the measurement of the shear signal. We find that the bispectrum is very effective in mitigating these systematic errors. Varying all three systematics simultaneously, a joint power spectrum and bispectrum analysis reduces the area of credible regions for the cosmological parameters $Omega_mathrm{m}$ and $sigma_8$ by a factor of 90 and for the two parameters of a time-varying dark energy equation of state by a factor of almost 20, compared with the baseline approach of using the power spectrum alone and of imposing priors consistent with the accuracy requirements specified for Euclid. We also demonstrate that including the bispectrum self-calibrates all three systematic effects to the stringent levels required by the forthcoming generation of weak lensing surveys, thereby reducing the need for external calibration data.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"149 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91125415","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: 7

Matter power spectrum emulator for f(R) modified gravity cosmologies f(R)修正重力宇宙学的物质功率谱模拟器

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-10-01 DOI: 10.1103/PhysRevD.103.123525

Nesar Ramachandra, Georgios Valogiannis, M. Ishak, K. Heitmann

{"title":"Matter power spectrum emulator for \u0000f(R)\u0000 modified gravity cosmologies","authors":"Nesar Ramachandra, Georgios Valogiannis, M. Ishak, K. Heitmann","doi":"10.1103/PhysRevD.103.123525","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.123525","url":null,"abstract":"Testing a subset of viable cosmological models beyond General Relativity (GR), with implications for cosmic acceleration and the Dark Energy associated with it, is within the reach of Rubin Observatory Legacy Survey of Space and Time (LSST) and a part of its endeavor. Deviations from GR-w(z)CDM models can manifest in the growth rate of structure and lensing, as well as in screening effects on non-linear scales. We explore the constraining power of small-scale deviations predicted by the f(R) Hu-Sawicki Modified Gravity (MG) candidate, by emulating this model with COLA (COmoving Lagrangian Acceleration) simulations. We present the experimental design, data generation, and interpolation schemes in cosmological parameters and across redshifts for the emulation of the boost in the power spectra due to Modified Gravity effects. Three preliminary applications of the emulator highlight the sensitivity to cosmological parameters, Fisher forecasting and Markov Chain Monte Carlo inference for a fiducial cosmology. This emulator will play an important role for future cosmological analysis handling the formidable amount of data expected from Rubin Observatory LSST.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83204883","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: 14

Very Large Array observations of the mini-halo and AGN feedback in the Phoenix cluster 菲尼克斯星团中微晕和AGN反馈的甚大阵列观测

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-09-28 DOI: 10.1051/0004-6361/202039075

R. Timmerman, R. Weeren, M. Mcdonald, A. Ignesti, B. McNamara, J. Hlavacek-Larrondo, H. Röttgering

{"title":"Very Large Array observations of the mini-halo and AGN feedback in the Phoenix cluster","authors":"R. Timmerman, R. Weeren, M. Mcdonald, A. Ignesti, B. McNamara, J. Hlavacek-Larrondo, H. Röttgering","doi":"10.1051/0004-6361/202039075","DOIUrl":"https://doi.org/10.1051/0004-6361/202039075","url":null,"abstract":"(Abridged) The relaxed cool-core Phoenix cluster (SPT-CL J2344-4243) features an extremely strong cooling flow, as well as a mini-halo. Strong star-formation in the brightest cluster galaxy indicates that AGN feedback has been unable to inhibit this cooling flow. We have studied the strong cooling flow in the Phoenix cluster by determining the radio properties of the AGN and its lobes. In addition, we use spatially resolved observations to investigate the origin of the mini-halo. We present new Very Large Array 1-12 GHz observations of the Phoenix cluster which resolve the AGN and its lobes in all four frequency bands, and resolve the mini-halo in L- and S-band. Using our L-band observations, we measure the total flux density of the radio lobes at 1.5 GHz to be $7.6pm0.8$ mJy, and the flux density of the mini-halo to be $8.5pm0.9$ mJy. Using L- and X-band images, we produce the first spectral index maps of the lobes from the AGN and measure the spectral indices of the northern and southern lobes to be $-1.35pm0.07$ and $-1.30pm0.12$, respectively. Similarly, using L- and S-band data, we map the spectral index of the mini-halo, and obtain an integrated spectral index of $alpha=-0.95 pm 0.10$. We find that the mini-halo is most likely formed by turbulent re-acceleration powered by sloshing in the cool core due to a recent merger. In addition, we find that the feedback in the Phoenix cluster is consistent with the picture that stronger cooling flows are to be expected for massive clusters like the Phoenix cluster, as these may feature an underweight supermassive black hole due to their merging history. Strong time variability of the AGN on Myr-timescales may help explain the disconnection between the radio and the X-ray properties of the system. Finally, a small amount of jet precession likely contributes to the relatively low ICM re-heating efficiency of the mechanical feedback.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90874286","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: 2

Constraints on primordial black holes and curvature perturbations from the global 21-cm signal 原始黑洞的约束和来自全球21厘米信号的曲率扰动

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-09-24 DOI: 10.1103/physrevd.102.083538

Yupeng Yang

{"title":"Constraints on primordial black holes and curvature perturbations from the global 21-cm signal","authors":"Yupeng Yang","doi":"10.1103/physrevd.102.083538","DOIUrl":"https://doi.org/10.1103/physrevd.102.083538","url":null,"abstract":"The recent observations of the global 21cm signal by EDGES and gravitational waves by LIGO/VIGO have revived interest in PBHs. Different from previous works, we investigate the influence of PBHs on the evolution of the IGM for the mass range $6times 10^{13} {rm g} lesssim M_{rm PBH}lesssim 3times 10^{14} rm g$. Since the lifetime of these PBHs is smaller than the present age of the Universe, they have evaporated by the present day. Due to Hawking radiation, the heating effects of PBHs on the IGM can suppress the absorption amplitude of the global 21cm signal. In this work, by requiring that the differential brightness temperature of the global 21cm signals in the redshift range of $10lesssim z lesssim 30$, e.g., $delta T_{b} lesssim -100~rm mK$, we obtain upper limits on the initial mass fraction of PBHs. We find that the strongest upper limit is $beta_{rm PBH} sim 2times 10^{-30}$. Since the formation of PBHs is related to primordial curvature perturbations, by using the constraints on the initial mass fraction of PBHs we obtain the upper limits on the power spectrum of primordial curvature perturbations for the scale range $8.0times 10^{15}lesssim k lesssim 1.8times 10^{16}~rm Mpc^{-1}$, corresponding to the mass range considered here. We find that the strongest upper limit is $mathcal P_{mathcal R}(k) sim 0.0046$. By comparing with previous works, we find that for the mass range (or the scale range) investigated in this work the global 21cm signals or the 21cm power spectrum should give the strongest upper limits on the initial mass fraction of PBHs and on the power spectrum of primordial curvature perturbations.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81237017","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: 10

The value of the Hubble–Lemaître constant queried by Type Ia supernovae: a journey from the Calán-Tololo Project to the Carnegie Supernova Program Ia型超新星查询的哈勃- lema<e:1>常数的值:从Calán-Tololo项目到卡内基超新星计划的旅程

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-09-22 DOI: 10.1093/mnras/staa3350

M. Hamuy, R. Cartier, C. Contreras, N. Suntzeff

{"title":"The value of the Hubble–Lemaître constant queried by Type Ia supernovae: a journey from the Calán-Tololo Project to the Carnegie Supernova Program","authors":"M. Hamuy, R. Cartier, C. Contreras, N. Suntzeff","doi":"10.1093/mnras/staa3350","DOIUrl":"https://doi.org/10.1093/mnras/staa3350","url":null,"abstract":"We assess the robustness of the two highest rungs of the \"cosmic distance ladder\" for Type Ia supernovae and the determination of the Hubble-Lemaitre constant. In this analysis, we hold fixed Rung 1 as the distance to the LMC determined to 1 % using Detached Eclipsing Binary stars. For Rung 2 we analyze two methods, the TRGB and Cepheid distances for the luminosity calibration of Type Ia supernovae in nearby galaxies. For Rung 3 we analyze various modern digital supernova samples in the Hubble flow, such as the Calan-Tololo, CfA, CSP, and Supercal datasets. This metadata analysis demonstrates that the TRGB calibration yields smaller $H_0$ values than the Cepheid calibration, a direct consequence of the systematic difference in the distance moduli calibrated from these two methods. Selecting the three most independent possible methodologies/bandpasses ($B$, $V$, $J$), we obtain $H_{0}=69.9 pm 0.8$ and $H_{0} =73.5 pm 0.7$ km s$^{-1}$ Mpc$^{-1}$ from the TRGB and Cepheid calibrations, respectively. Adding in quadrature the systematic uncertainty in the TRGB and Cepheid methods of 1.1 and 1.0 km s$^{-1}$ Mpc$^{-1}$, respectively, this subset reveals a significant 2.0 $sigma$ systematic difference in the calibration of Rung 2. If Rung 1 and Rung 2 are held fixed, the different formalisms developed for standardizing the supernova peak magnitudes yield consistent results, with a standard deviation of 1.5 km s$^{-1}$ Mpc$^{-1}$, that is, Type Ia supernovae are able to anchor Rung 3 with 2 % precision. This study demonstrates that Type Ia supernovae have provided a remarkably robust calibration of R3 for over 25 years.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83114801","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: 5

Early dark energy is not excluded by current large-scale structure data 目前的大尺度结构数据并未排除早期暗能量

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-09-22 DOI: 10.1103/PhysRevD.103.123542

Tristan L. Smith, V. Poulin, J. Bernal, K. Boddy, M. Kamionkowski, R. Murgia

{"title":"Early dark energy is not excluded by current large-scale structure data","authors":"Tristan L. Smith, V. Poulin, J. Bernal, K. Boddy, M. Kamionkowski, R. Murgia","doi":"10.1103/PhysRevD.103.123542","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.123542","url":null,"abstract":"We revisit the impact of early dark energy (EDE) on galaxy clustering using BOSS galaxy power spectra, analyzed using the effective field theory (EFT) of large-scale structure (LSS), and anisotropies of the cosmic microwave background (CMB) from Planck. Recent studies found that these data place stringent constraints on the maximum abundance of EDE allowed in the Universe. We argue here that their conclusions are a consequence of their choice of priors on the EDE parameter space, rather than any disagreement between the data and the model. For example, when considering EFT-LSS, CMB, and high-redshift supernovae data we find the EDE and $Lambda$CDM models can provide statistically indistinguishable fits ($Delta chi^2 = 0.12$) with a relatively large value for the maximum fraction of energy density in the EDE ($f_{rm ede} = 0.09$) and Hubble constant ($H_0 = 71$ km/s/Mpc) in the EDE model. Moreover, we demonstrate that the constraining power added from the inclusion of EFT-LSS traces to the potential tension between the power-spectrum amplitudes $A_s$ derived from BOSS and from Planck that arises even within the context of $Lambda$CDM. Until this is better understood, caution should be used when interpreting EFT-BOSS+Planck constraints to models beyond $Lambda$CDM. These findings suggest that EDE still provides a potential resolution to the Hubble tension and that it is worthwhile to test the predictions of EDE with future data-sets and further study its theoretical possibilities.","PeriodicalId":8431,"journal":{"name":"arXiv: Cosmology and Nongalactic Astrophysics","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91007651","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: 73

Imprints of axion superradiance in the CMB CMB中轴子超辐射的印记

arXiv: Cosmology and Nongalactic Astrophysics Pub Date : 2020-09-21 DOI: 10.1103/physrevd.102.103018

D. Blas, S. Witte

引用次数: 11