The Cosmic Gravitational Wave Background was discovered! Spacetime is vibrating with the constant thrum of gravitational waves from supermassive black hole binary systems (SMBHBs) but also possibly new physics from the Big Bang!

00:00 Introduction
02:02 Gravitational Waves Explained
03:53 Using Pulsar Timing Array to Detect Gravitational Waves
08:15 PTA Collaborations
09:10 How they know its the Gravitational Wave Background and not something else?
11:50 Final Parsec Problem?
12:54 Nearby SMBHBs?
13:29 New Physics from the Big Bang?

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References:
Agazie et al. 2023: https://doi.org/10.3847/20418213/acdac6
Agazie et al. 2023: https://doi.org/10.3847/20418213/acda9a
Agazie et al. 2023: https://doi.org/10.3847/20418213/acda88
Agazie et al. 2023: https://doi.org/10.3847/20418213/acdc91'>https://doi.org/10.3847/20418213/acdc91
Agazie et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Agazie et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Afzal et al. 2023: https://doi.org/10.3847/20418213/acdc91'>https://doi.org/10.3847/20418213/acdc91
Antoniadis et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Antoniadis et al. 2023: https://doi.org/10.1051/00046361/202...
Antoniadis et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Antoniadis et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Antoniadis et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Reardon et al. 2023: https://doi.org/10.3847/20418213/acdd02
Smarra et al. 2023: https://doi.org/10.48550/arXiv.2306.1...
Xu et al. 2023: https://doi.org/10.1088/16744527/acdfa5

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Earth
14:44 Cosmic Strings?
16:24 No Anisotropy?
17:47 What's Next