The First Thing You'll Learn in a String Theory Class

As a string moves through spacetime, it sweeps out a surface called its worldsheet. The starting point for string theory sets the action equal to the area of this worldsheet. Get the notes for free here: https://courses.physicswithelliot.com/notes-sign-up Get all the links here: https://www.physicswithelliot.com/string-action-mini This video is part 4 of the series I've been sharing with you about the principle of least action. The first video was about a particle in Newtonian mechanics, the second was about a particle in special relativity, and the third about a particle in general relativity. In this video, we'll learn about the principle of least action for string theory. It's called the Nambu-Goto action, and it's given by the area of the worldsheet that the string sweeps out as it moves through spacetime. Part 1 Introduction to the principle of least action: https://youtu.be/sUk9y23FPHk Part 2 The action in special relativity: https://youtu.be/KVk1QNTWBxQ Part 3 The action in general relativity: https://youtu.be/h2SEK6Jjv3Y Tutoring inquiries: https://www.physicswithelliot.com/tutoring If you find the content I’m creating valuable and would like to help make it possible for me to continue sharing more, please consider supporting me! You can make a recurring contribution at https://www.Patreon.com/PhysicsWithElliot, or make a one time contribution at https://www.physicswithelliot.com/support-me. Thank you so much! About physics mini lessons: In these intermediate-level physics lessons, I'll try to give you a self-contained introduction to some fascinating physics topics. If you're just getting started on your physics journey, you might not understand every single detail in every video---that's totally fine! What I'm really hoping is that you'll be inspired to go off and keep learning more on your own. About me: I’m Dr. Elliot Schneider. I love physics, and I want to help others learn (and learn to love) physics, too. Whether you’re a beginner just starting out with your physics studies, a more advanced student, or a lifelong learner, I hope you’ll find resources here that enable you to deepen your understanding of the laws of nature. For more cool physics stuff, visit me at https://www.physicswithelliot.com.