Possible? Outrageous? Or does the science say we can exceed the speed of light if we just don't accelerate though it from a speed below it? The speed of light as a barrier? Technical.
Warp Drive News. Seriously! By Sabine Hossenfelder, 441K subscribers
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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...
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 ...
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