Description:
Did you know that Einstein's most important equation isn't E=mc^2? Find out all about his equation that expresses how spacetime curves, with Sean Carroll. Buy Sean's book here: https://geni.us/AIAOUHn YouTube channel members can watch the Q&A for this lecture here: https://www.youtube.com/watch?v=sO5adbV_mu8 Become one of our YouTube members for early, ad-free access to our videos, and other perks: https://www.youtube.com/channel/UCYeF244yNGuFefuFKqxIAXw/join This lecture was recorded at the Ri on Monday 14 August 2023. 00:00 Einstein’s most important equation 3:37 Why Newton’s equations are so important 9:30 The two kinds of relativity 12:53 Why is it the geometry of spacetime that matters? 16:37 The principle of equivalence 18:39 Types of non-Euclidean geometry 26:26 The Metric Tensor and equations 32:22 Interstellar and time and space twisting 33:32 The Riemann tensor 37:45 A physical theory of gravity 43:28 How to solve Einstein’s equation 47:50 Using the equation to make predictions 51:05 How its been used to find black holes The real Einstein's Equation is part of general relativity, which relates the curvature of spacetime to the mass and energy distributed within it. Sean explains why the geometry of spacetime has anything to do with gravity, and how this famous equation expresses the way that spacetime curves. Sean Carroll is Homewood Professor of natural philosophy at Johns Hopkins University. He won the Royal Society Winton Prize for his book about the search for the elusive Higgs boson, The Particle at the End of the Universe, and The Big Picture was an international bestseller. His most recent book is Something Deeply Hidden. He lives in Baltimore. Copies of Sean's latest book, 'The Biggest Ideas in the Universe 1: Space, Time and Motion', are available from Amazon and all good bookstores. The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and TikTok: https://www.tiktok.com/@ri_science Listen to the Ri podcast: https://podcasters.spotify.com/pod/show/ri-science-podcast Our editorial policy: https://www.rigb.org/editing-ri-talks-and-moderating-comments Subscribe for the latest science videos: http://bit.ly/RiNewsletter Product links on this page may be affiliate links which means it won't cost you any extra but we may earn a small commission if you decide to purchase through the link.
Preparing download options
http://unidownloader.com/ website is the best way to download a video or a separate audio track if you want to do without installing programs and extensions.
The UDL Helper extension is a convenient button that is seamlessly integrated into YouTube, Instagram and OK.ru sites for fast content download.
UDL Client program (for Windows) is the most powerful solution that supports more than 900 websites, social networks and video hosting sites, as well as any video quality that is available in the source.
UDL Lite is a really convenient way to access a website from your mobile device. With its help, you can easily download videos directly to your smartphone.
The best quality formats are FullHD (1080p), 2K (1440p), 4K (2160p) and 8K (4320p). The higher the resolution of your screen, the higher the video quality should be. However, there are other factors to consider: download speed, amount of free space, and device performance during playback.
The browser/computer should not freeze completely! If this happens, please report it with a link to the video. Sometimes videos cannot be downloaded directly in a suitable format, so we have added the ability to convert the file to the desired format. In some cases, this process may actively use computer resources.
You can download a video to your smartphone using the website or the PWA application UDL Lite. It is also possible to send a download link via QR code using the UDL Helper extension.
The most convenient way is to use the UDL Client program, which supports converting video to MP3 format. In some cases, MP3 can also be downloaded through the UDL Helper extension.
This feature is available in the UDL Helper extension. Make sure that "Show the video snapshot button" is checked in the settings. A camera icon should appear in the lower right corner of the player to the left of the "Settings" icon. When you click on it, the current frame from the video will be saved to your computer in JPEG format.
It costs nothing. Our services are absolutely free for all users. There are no PRO subscriptions, no restrictions on the number or maximum length of downloaded videos.