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== Questions by Eric Weinstein == | == Questions by Eric Weinstein == | ||
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=== What is $$F_A$$ geometrically? = | <div style="font-weight:bold;line-height:1.6;">What is $$F_A$$ geometrically?</div> | ||
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$$F_A$$ is the curvature tensor associated to the connection or vector potential $$A$$. | $$F_A$$ is the curvature tensor associated to the connection or vector potential $$A$$. | ||
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=== | <div class="toccolours mw-collapsible mw-collapsed" style="width:400px; overflow:auto;"> | ||
<div style="font-weight:bold;line-height:1.6;">What are $$R_{\mu v}$$ and $$R$$ geometrically?</div> | |||
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[https://www.youtube.com/watch?v=UfThVvBWZxM&t=12m6s Explanation of $$R$$] | [https://www.youtube.com/watch?v=UfThVvBWZxM&t=12m6s Explanation of $$R$$] | ||
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In the video, they focus first on the curvature of space. Hopefully they incorporate back in curvature in time, because that's less obvious. | In the video, they focus first on the curvature of space. Hopefully they incorporate back in curvature in time, because that's less obvious. | ||
The same video then proceeds to explain $$R_{\mu v}$$. It progresses through some concepts. | The same video then proceeds to explain $$R_{\mu v}$$. It progresses through some concepts. | ||
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<div style="font-weight:bold;line-height:1.6;">How do they relate?</div> | |||
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[https://en.wikipedia.org/wiki/Cohomology Cohomology] | |||
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<div style="font-weight:bold;line-height:1.6;">What does this have to do with Penrose Stairs?</div> | |||
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* [https://en.wikipedia.org/wiki/Penrose_stairs Penrose stairs] | * [https://en.wikipedia.org/wiki/Penrose_stairs Penrose stairs] | ||
* [https://en.wikipedia.org/wiki/Spinor Spinor] | * [https://en.wikipedia.org/wiki/Spinor Spinor] | ||
We’ve heard Eric talk about Penrose stairs and spinors - essentially phenomena where you cannot return to the original state through a 360 degree rotation, but require a 720 degree rotation. | |||
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=== What are “Horizontal Subspaces” and what do they have to do with Vector Potentials or Gauge fields? = | <div class="toccolours mw-collapsible mw-collapsed" style="width:400px; overflow:auto;"> | ||
<div style="font-weight:bold;line-height:1.6;">What are “Horizontal Subspaces” and what do they have to do with Vector Potentials or Gauge fields?</div> | |||
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* [https://en.wikipedia.org/wiki/Vertical_and_horizontal_bundles Vertical and horizontal bundles] | * [https://en.wikipedia.org/wiki/Vertical_and_horizontal_bundles Vertical and horizontal bundles] | ||
* [https://en.wikipedia.org/wiki/Introduction_to_gauge_theory Introduction to gauge theory] | * [https://en.wikipedia.org/wiki/Introduction_to_gauge_theory Introduction to gauge theory] | ||
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But doesn't this require the symmetry break? How is left and right rotation in a subspace transformed into verticality? This is a crazy rabbit hole, friends. Keep your chins up. Let me know if this was helpful or leading astray. | But doesn't this require the symmetry break? How is left and right rotation in a subspace transformed into verticality? This is a crazy rabbit hole, friends. Keep your chins up. Let me know if this was helpful or leading astray. | ||
</blockquote> | </blockquote> | ||
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== Further Resources == | == Further Resources == |
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