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Wednesday, March 23, 2022

Is a Warp Drive Possible?

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:


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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