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Hiranya Peiris and the Multiverse: Is There Any Evidence for Other Universes? Analytics Table

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Listen before you watch: https://drive.google.com/file/d/1Rc1fVXmFKyHZt6yIrrcYTNSSK6tfDsLo/view Is there any evidence for a multiverse? We separate what has been measured from what is theory, follow Hiranya Peiris's search for collisions with other universes in the cosmic microwave background, and explain why the honest answer today is: no confirmed evidence. Go deeper: the plain-language multiverse handout (10-page PDF): https://raramedia.gumroad.com/l/hryhzi Short: https://www.youtube.com/shorts/OhNWeVYth_g Chapters: 0:00 Could Our Universe Be One of Many? 0:30 One Word, Several Ideas 1:22 What Has Actually Been Measured 2:13 The Theory Behind the Bubbles 2:58 The String Landscape 3:36 A Prediction, and What It Shows 4:26 The Direct Test: Hiranya Peiris 5:27 The Cold Spot 6:10 Other Tests and the Probability Problem 6:50 Many-Worlds 7:30 Where Physicists Disagree 8:12 What Could Settle It 8:55 So, Is There Any Evidence? SOURCES Planck 2018 results VI (parameters), A&A 641, A6: https://arxiv.org/abs/1807.06209 Planck 2018 results X (inflation), A&A 641, A10: https://arxiv.org/abs/1807.06211 Planck 2018 results VII (isotropy, Cold Spot), A&A 641, A7: https://arxiv.org/abs/1906.02552 Riess et al. 1998, AJ 116, 1009: https://arxiv.org/abs/astro-ph/9805201 Perlmutter et al. 1999, ApJ 517, 565: https://arxiv.org/abs/astro-ph/9812133 Guth 2007, Eternal inflation and its implications: https://arxiv.org/abs/hep-th/0702178 BICEP/Keck 2021, PRL 127, 151301: https://arxiv.org/abs/2110.00483 Tegmark 2003, Parallel universes: https://arxiv.org/abs/astro-ph/0302131 Everett 1957, Rev. Mod. Phys. 29, 454: https://doi.org/10.1103/RevModPhys.29.454 Bousso & Polchinski 2000, JHEP 06, 006: https://arxiv.org/abs/hep-th/0004134 Obied et al. 2018 (preprint): https://arxiv.org/abs/1806.08362 Weinberg 2000, The cosmological constant problems: https://arxiv.org/abs/astro-ph/0005265 Martel, Shapiro & Weinberg 1998, ApJ 492, 29: https://arxiv.org/abs/astro-ph/9701099 DESI DR2 2025, PRD 112, 083515: https://arxiv.org/abs/2503.14738 Feeney et al. 2011, PRL 107, 071301: https://arxiv.org/abs/1012.1995 Feeney et al. 2011, PRD 84, 043507: https://arxiv.org/abs/1012.3667 Feeney et al. 2013, PRD 88, 043012: https://arxiv.org/abs/1210.2725 Cruz et al. 2005, MNRAS 356, 29: https://arxiv.org/abs/astro-ph/0405341 Szapudi et al. 2015, MNRAS 450, 288: https://arxiv.org/abs/1405.1566 Mackenzie et al. 2017, MNRAS 470, 2328: https://arxiv.org/abs/1704.03814 Guth & Nomura 2012, PRD 86, 023534: https://arxiv.org/abs/1203.6876 Donadi et al. 2021, Nature Physics 17, 74: https://doi.org/10.1038/s41567-020-1008-4 Ijjas, Steinhardt & Loeb 2013, PLB 723, 261: https://arxiv.org/abs/1304.2785 Guth, Kaiser & Nomura 2014, PLB 733, 112: https://arxiv.org/abs/1312.7619 Ellis & Silk 2014, Nature 516, 321: https://www.nature.com/articles/516321a Scientific American, July 2025, CMB-S4: https://www.scientificamerican.com/article/u-s-ends-support-for-cmb-s4-project-to-study-cosmic-inflation/ JAXA/ISAS, LiteBIRD (launch target JFY2036): https://www.isas.jaxa.jp/en/missions/spacecraft/future/litebird.html Kavli IPMU, 7 Aug 2026, LiteBIRD review: https://www.ipmu.jp/en/20260807-LiteBIRD NASA, 11 Mar 2025, SPHEREx launch: https://www.nasa.gov/news-release/nasa-launches-missions-to-study-sun-universes-beginning/ IMAGE CREDITS Hubble eXtreme Deep Field: NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team (CC BY 4.0) https://esahubble.org/images/heic1214a/ WMAP nine-year map: NASA / LAMBDA Archive Team (WMAP Science Team) https://lambda.gsfc.nasa.gov/product/wmap/dr5/m_images.html Universe timeline: NASA / LAMBDA Archive Team https://lambda.gsfc.nasa.gov/resources/graphic_history/ Euclid's view of the Perseus cluster of galaxies: ESA/Euclid/Euclid Consortium/NASA, image processing by J.-C. Cuillandre (CEA Paris-Saclay), G. Anselmi. Licensed under CC BY-SA 3.0 IGO https://creativecommons.org/licenses/by-sa/3.0/igo/ . Source: https://www.esa.int/ESA_Multimedia/Images/2023/11/Euclid_s_view_of_the_Perseus_cluster_of_galaxies "Dark Sector Amundsen–Scott South Pole Station" by Christopher Michel (photo taken 29 November 2013), via Wikimedia Commons. Licensed under CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/ . Source: https://commons.wikimedia.org/wiki/File:Dark_Sector_Amundsen%E2%80%93Scott_South_Pole_Station.jpg Milky Way panorama: ESO/S. Brunier (CC BY 4.0) https://www.eso.org/public/images/eso0932a/ The Euclid and South Pole images are cropped, zoomed or resized in the video; those adapted versions are shared under the same licences. The WMAP map is false color. Diagrams, maps and cards marked "Illustration" were made by What the Evidence Shows. Planck results are cited as text only. No agency or observatory endorses this channel. #Multiverse #Cosmology #Astronomy

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