The low-redshift velocity field is a unique probe of the growth of cosmic structure and gravity. We propose to use distances from gravitational wave (GW) detections, in conjunction with the redshifts of their host galaxies from wide field spectroscopic surveys (e.g. DESI, 4MOST, TAIPAN), to measure peculiar motions within the local Universe. Such measurement has the potential to constrain the growth rate $fσ_8$ and test gravity through determination of the gravitational growth index $γ$, complementing constraints from other peculiar velocity measurements. We find that binary neutron star mergers with associated counterpart at $z\lesssim 0.2$ that will be detected by the Einstein Telescope (ET) will be able to constrain $fσ_8$ to $\sim 3\%$ precision after $10$ years of operations when combined with galaxy overdensities from DESI and TAIPAN. If a larger network of third generation GW detectors is available (e.g. including the Cosmic Explorer), the same constraints can be reached over a shorter timescale ($\sim 5$ years for a 3 detectors network). The same events (plus information from their hosts' redshifts) can constrain $γ$ to $σ_γ\lesssim 0.04$. This constraint is precise enough to discern General Relativity from other popular gravity models at $3σ$. This constraint is improved to $σ_γ\sim 0.02-0.03$ when combined with galaxy overdensities. The potential of combining galaxies' peculiar velocities with gravitational wave detections for cosmology highlights the need for extensive optical to near--infrared follow--up of nearby gravitational wave events, or exquisite GW localization, in the next decade.
Amongst the most popular explanations for dark energy are modified theories of gravity. The galaxy overdensity and peculiar velocity fields help us to constrain the growth rate of structure and distinguish different models of gravity. We introduce an improved method for constraining the growth rate of structure with the galaxy overdensity and peculiar velocity fields. This method reduces the modelling systematic error by accounting for the wide-angle effect and the zero-point calibration uncertainty during the modelling process. We also speed up the posterior sampling by around 30 times by fir…
Galaxy peculiar velocities provide an integral source of cosmological information that can be harnessed to measure the growth rate of large scale structure and constrain possible extensions to General Relativity. In this work, we present a method for extracting the information contained within galaxy peculiar velocities through an ensemble of direct peculiar velocity and galaxy clustering correlation statistics, including the effects of redshift space distortions, using data from the 6-degree Field Galaxy Survey. Our method compares the auto- and cross-correlation function multipoles of these …
The peculiar velocity correlation function of the Cosmicflows-4 catalog
Shanghai Jiao Tong University(上海交通大学);Ohio University(俄亥俄大学);University of Kansas(堪萨斯大学);Willamette University(威拉米特大学);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交大李政道研究所)
The DESI DR1 Peculiar Velocity Survey: growth rate measurements from the maximum likelihood fields method
The University of Queensland(昆士兰大学);The University of Arizona(亚利桑那大学);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Boston University(波士顿大学);Carnegie Mellon University(卡内基梅隆大学);Aix-Marseille University(艾克斯-马赛大学);University of Rochester(罗切斯特大学);Università degli Studi di Milano(米兰大学);INAF-Osservatorio Astronomico di Brera(布拉耶天文台);Swinburne University of Technology(斯威本科技大学);University College London(伦敦大学学院);Korea Astronomy and Space Science Institute(韩国天体宇宙科学研究所)
Probing Baryons with the Kinematic Sunyae Zel'dovich Effect and Machine Learning Derived Peculiar Velocities using DESI DR2 and ACT DR6
Cornell University(康奈尔大学);University of Pennsylvania(宾夕法尼亚大学);Kavli Institute for Cosmology Cambridge(卡弗里宇宙学剑桥研究所);Academia Sinica (ASIAA)(中央研究院天文及天体物理研究所);Duke University(杜克大学);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Boston University(波士顿大学);Instituto Avanzado de Cosmología A. C.(先进宇宙学研究所);Universidad Nacional Autónoma de México(墨西哥国立自治大学)
Cosmological peculiar velocities in general relativity
Queen Mary University of London(伦敦大学玛丽女王学院);University of the Western Cape(西开普敦大学);National Institute for Theoretical & Computational Sciences(理论与计算科学国家研究所)
The Peculiar Growth of Structure: Validating $fσ_8$ Measurements from TITAN Type Ia Supernovae and the Uchuu Simulations
University of Hawai‘i(夏威夷大学);University of Hawai‘i at Hilo(夏威夷大学希洛分校);Duke University(杜克大学);University of Oxford(牛津大学);Johns Hopkins University(约翰斯·霍普金斯大学);Boston University(波士顿大学);Sorbonne Université(索邦大学)
The DESI DR1 peculiar velocity survey: growth rate measurements from the galaxy power spectrum
Aix-Marseille University, CNRS/IN2P3, CPPM(艾克斯-马赛大学,法国国家科学研究中心/法国国家粒子物理研究所,粒子物理中心);Centre for Astrophysics & Supercomputing, Swinburne University of Technology(天体物理学与超级计算中心,斯威本科技大学);School of Mathematics and Physics, University of Queensland(昆士兰大学数学与物理学院);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);University of Science and Technology(韩国科学技术院);Steward Observatory, University of Arizona(亚利桑那大学斯图尔德天文台);Department of Physics, Carnegie Mellon University(卡内基梅隆大学物理系);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Department of Physics, Boston University(波士顿大学物理系);Dipartimento di Fisica “Aldo Pontremoli”, Università degli Studi di Milano(米兰大学阿尔多·蓬特罗莫利物理系)
Effective Theories of Redshift-Space Galaxy Peculiar Velocities
School of Natural Sciences, Institute for Advanced Study(自然科技学院,高等研究院);Physics Department, Columbia University(哥伦比亚大学物理系);School of Mathematics and Physics, The University of Queensland(昆士兰大学数学与物理学院);Aix-Marseille University, CNRS/IN2P3, CPPM(艾克斯-马赛大学,法国国家科学研究中心/欧洲核子研究组织粒子与物理研究所,粒子与宇宙学中心)
We have studied the galaxy-group cross-correlations in redshift space for the Galaxy And Mass Assembly (GAMA) Survey. We use a set of mock GAMA galaxy and group catalogues to develop and test a novel 'halo streaming' model for redshift-space distortions. This treats 2-halo correlations via the streaming model, plus an empirical 1-halo term derived from the mocks, allowing accurate modelling into the nonlinear regime. In order to probe the robustness of the growth rate inferred from redshift-space distortions, we divide galaxies by colour, and divide groups according to their total stellar mass…