You can help finance my videos by supporting me on Patreon: https://www.patreon.com/Sabine What is a warp drive? Are they scientifically possible? How does the Alcubierre drive work? That's what we talk about today. The paper has now been published here: https://iopscience.iop.org/article/10.1088/1361-6382/abdf6e An open-access version is here: https://arxiv.org/pdf/2102.06824.pdf You can find more information about the authors' work here: https://appliedphysics.org/ When I talk about energy conservation around 7 mins, I am NOT referring to the conservation of the stress-energy-tensor. This is conservation is always fulfilled if Einstein's field equations are fulfilled by way of the (contracted) Bianchi identities. I am talking about the conservation of the four-momentum (the integrated quantity) that is associated with the warp-drive bubble. In an asymptotically flat space-time, it should be conserved. If the bubble accelerates, it isn't. (As you'd expect.) #physics #space #science 0:00 Intro and Motivation 0:46 What is a Warp Drive? 2:47 The Alcubierre Drive 3:54 General Relativity Background 6:09 The Problem with the Alcubierre Drive 7:26 New Paper 9:37 What the new paper may be good for