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New Video: Black Hole’s Evil Twin – Gravastars Explained (Patreon)

Published:
2024-12-03 15:00:13
Imported:
2026-06
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Content

Gravastars could change how we think about the universe. These cosmic objects solve black holes’ biggest problems without breaking physics. From their ultra-thin shell to their energy-filled core, gravastars are both elegant and terrifying. But what exactly are they?

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Black Hole's Evil Twin - Gravastars Explained

Go to https://brilliant.org/nutshell/ to dive deeper into these topics and more with a free 30-day trial + 20% off the premium subscription! This video was sponsored by Brilliant. Thanks a lot for the support! Your 12,025 Human Era Calendar is waiting!

Comments

Thornhenge

What's the distinction between "vacuum" and "space"?

Patrick W. Gilmore

So a gravitar just happens to have the same radius as the event horizon of a black hole with the same mass? This process magically creates a shell just outside the limit where physics would break? Seems a bit too perfect.

Patrick W. Gilmore

Something confuses me. The shell has a radius very slightly larger than the event horizon of a black hole with the same mass. But there is an enormous amount of energy in the middle - the nothingness. Wouldn't all the energy in the middle have gravity, and therefore expand the Schwarzschild radius of the entire system? If so, why wouldn't the shell would get swallowed in an event horizon?

carbonping

What happened to the subtitles for this video? I'm usually behind by several weeks in my news flow, so it's not often I catch these videos on the week they're released. Do subtitles usually only get added some weeks afterwards, or are they usually there from the start?

Outside
>>157204329

The gravastar’s shell radius isn’t magical but arises naturally from system’s balance. The core’s vacuum energy creates negative pressure, countering gravity, while the shell sits just outside the Schwarzschild radius due to this precise equilibrium. The system’s total mass includes the vacuum energy and shell, so it doesn’t “magically” expand or collapse—it’s not coincidence.

Outside
>>157204736

The energy in the “nothingness” (de Sitter vacuum) & the shell are in the system’s total mass, which determines the Schwarzschild radius. The shell is stable because the internal vacuum is negative pressure (casimir effect but extreme) balances the shell’s gravity. This prevents the system from collapsing into an event horizon. The key is that the total mass of the gravastar is already accounted for, so the shell doesn’t get “swallowed.”

Outside
>>157164890

Space is a region, an expanse, vacuum is quite literally the absolution of emptiness, not space.