We present the successful recovery of common envelope ejection efficiency assumed in a simulated population of double white dwarf binaries like those which may be observed by the future LISA mission. We simulate the formation of double white dwarf binaries by using the COSMIC population synthesis code to sample binary formation conditions such as initial mass function, metallicity of star formation, initial orbital period, and initial eccentricity. These binaries are placed in the m12i synthetic Milky-Way-like galaxy, and their signal-to-noise ratio for the LISA instrument is estimated, considering a galactic gravitational wave foreground informed by the population. Through the use of Fisher estimates, we construct a likelihood function for the measurement error of the LISA-bright DWD binaries (> 20 SNR, fGW > 5mHz), in their gravitational wave frequency (fGW) and chirp mass. By repeating this process for different assumptions of the common envelope ejection efficiency, we apply Bayesian hierarchical inference to find the best match to an injected astrophysical assumption for a fiducial population model. We conclude that the impact of common envelope ejection efficiency on the mass transfer processes involved in double white dwarf formation may be statistically relevant in the future observed LISA population, and that constraints on binary formation may be found by comparing simulated populations to a future observed population.
Spectral separation of the stochastic gravitational-wave background for LISA: galactic, cosmological and astrophysical backgrounds
在其观测波段,激光干涉仪空间天线(LISA)将同时观测不同来源的随机引力波背景(SGWB)信号;来自银河系白矮星双星的轨道调制波形,一个双星黑洞产生的背景,并可能是宇宙学产生的SGWB。我们模拟了银河系白矮星双星的引力波发射的朗伯\cite{Lamberts}分布的基础上,并确定了一个复杂的波形从银河系前景。利用LISA探测到的银河系调制信号,利用Fisher信息和马尔可夫链蒙特卡罗方法对不同信号源的LISA噪声和参数进行了估计,并提出了相应的数据分析策略。我们同时估计银河系前景,天体物理和宇宙学背景,并估计未来的LISA观测SGWB在光谱域的3个通道$ A $,$ E $和$ T $的探测限。在预期的天体物理背景和银河系前景的背景下,宇宙学背景能量密度约为$ Ω_{GW,Cosmo} \approx 8 \times 10^{-13} $可以检测到LISA与我们的光谱分离策略。
A Foundation for Gravitational-Wave Population Inference within the LISA Global Fit
Vanderbilt University(范德堡大学);Fisk University(菲斯克大学);Northwestern University(西北大学);Monash University(蒙纳士大学);University of Toronto(多伦多大学);NASA Marshall Space Flight Center(美国国家航空航天局马歇尔太空飞行中心);Universities Space Research Association(大学空间研究协会);University of Alabama in Huntsville(亨茨维尔阿拉巴马大学)
Cosmic string gravitational wave backgrounds at LISA: II. Reconstruction of conventional signals over astrophysical foregrounds
Instituto de Física Corpuscular (IFIC), CSIC-Universitat de València(粒子物理研究所(IFIC),西班牙瓦伦西亚大学);Khon Kaen Particle Physics and Cosmology Theory Group (KKPaCT), Department of Physics, Faculty of Science, Khon Kaen University(孔敬大学理学院物理系)
Università di Milano-Bicocca(米兰比可卡大学);INFN, Sezione di Milano-Bicocca(意大利国家核物理研究所米兰比可卡分部);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所))
Simulation-based population inference of LISA's Galactic binaries: Bypassing the global fit
SISSA(的里雅斯特国际高等研究学院);INFN Sezione di Trieste(意大利国家核物理研究院的里雅斯特分部);IFPU - Institute for Fundamental Physics of the Universe(宇宙基础物理研究所);Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Artemis(蔚蓝海岸大学、蔚蓝海岸天文台);Astroparticule et Cosmologie, CNRS, Université Paris Cité(天体粒子与宇宙学实验室,巴黎西岱大学);Department of Physics, Imperial College London(伦敦帝国理工学院物理系);Italian Research Center on High Performance Computing, Big Data and Quantum Computing(意大利高性能计算、大数据和量子计算研究中心)
Revealing massive black hole astrophysics: The potential of hierarchical inference with extreme mass-ratio inspiral observations
Institute for Gravitational Research, University of Glasgow(格拉斯哥大学引力研究所);Institute for Gravitational Wave Astronomy & School of Physics and Astronomy, University of Birmingham(伯明翰大学引力波天文学所与物理天文学院)
Gravitational-Wave Background from Extragalactic Double White Dwarfs for LISA
Laboratoire Lagrange, Observatoire de la Côte d'Azur, Université Côte d'Azur, CNRS(拉格朗日实验室,地中海蔚蓝海岸天文台,蔚蓝海岸大学,法国国家科学研究中心);Artemis, Observatoire de la Côte d'Azur, Université Côte d'Azur, CNRS(阿耳忒弥斯实验室,地中海蔚蓝海岸天文台,蔚蓝海岸大学,法国国家科学研究中心);INFN, Sezione di Milano-Bicocca(意大利国家核物理研究所,米兰比可卡分部)
本研究使用 COSMIC 代码评估河外双白矮星对 LISA 探测随机引力波背景的贡献,发现该信号 4 年后可被探测,且其振幅受恒星形成率和双星演化模型影响显著。
Population synthesis and detection prospects for Galactic long-period transients with LISA
University of Tübingen(蒂宾根大学);Aristotle University of Thessaloniki(塞萨洛尼基亚里士多德大学);National Observatory of Athens(雅典国家天文台);Academy of Athens(雅典科学院);SRON Space Research Organisation Netherlands(荷兰空间研究组织)
Implications of the LISA stochastic signal from eccentric stellar mass black hole binaries in vacuum
Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台暗物质与空间天文重点实验室);School of Astronomy and Space Sciences, University of Science and Technology of China(中国科学技术大学天文与空间科学学院);SISSA(的里雅斯特国际高等研究学院);INFN Sezione di Trieste(意大利国家核物理研究所的里雅斯特分部);IFPU - Institute for Fundamental Physics of the Universe(宇宙基础物理研究所);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Dipartimento di Fisica “G. Occhialini”, Università degli Studi di Milano-Bicocca(米兰比可卡大学 G. Occhialini 物理系);INFN, Sezione di Milano-Bicocca(意大利国家核物理研究所米兰比可卡分部);Institute for Gravitational Wave Astronomy & School of Physics and Astronomy, University of Birmingham(伯明翰大学引力波天文学研究所及物理与天文学学院)
研究探讨了恒星级质量黑洞双星早期 inspiral 中的非圆轨道对随机引力波背景的影响,提出改进的 SGWB 模型并分析其对 LISA 检测的启示。