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[[UTAPwiki/セミナー/初期宇宙・相対論速報]] * An introduction to astrophysical gravitational wave background [#c278d2a7] ** Jun'ya Kume [#j2ae561f] The recent result of NANOGrav attracts our interests since it might be interpreted as the first ever detection of stochastic gravitational wave background (GWB). Although we cannot reject the possibility that the GWB has its origin in a primordial universe, the dominant source in its frequency range is usually expected to be supermassive blackhole binaries. In this situation, understanding the nature of astrophysical GWB might be useful to the cosmologists. What characterizes the spectral shape of it? How does it prevent the detection of primordial gravitational backgrounds in the forthcoming observation? The recent result of NANOGrav attracts our interests since it might be interpreted as the first ever detection of stochastic gravitational wave background (GWB). Although we cannot reject the possibility that the GWB has its origin in a primordial universe, the dominant source in its frequency range is usually expected to be supermassive blackhole binaries. In this situation, understanding the nature of astrophysical GWB might be useful to the cosmologists. What characterizes the spectral shape of it? How does it prevent the detection of primordial gravitational wave backgrounds in the forthcoming observation? In this seminar, I will make a review on the stochastic gravitational wave background from compact binary coalescences based on [1]. Then I discuss its resolvability which is studied in [1, 2] and briefly introduce recent ideas to remove it as foreground noise [3, 4]. References: [1] P. A. Rosado, Phys. Rev. D 84, 084004 (2011). [2] S. Sachdev, T. Regimbau and B. Sathyaprakash, (2020), arXiv:2002.05365 [gr-qc]. [3] A. Sharma and J. Harms, (2020), arXiv:2006.16116 [gr-qc]. [4] S. Biscoveanu, C. Talbot, E. Thrane and R. Smith, (2020), arXiv:2009.04418 [astro-ph.HE] |