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ktrask commented on Neutron Stars Hint at Another Dimension   nautil.us/neutron-stars-h... · Posted by u/dnetesn
the__alchemist · 5 months ago
> Gravity, the thinking goes, can escape our brane and extend into the bulk. That explains why it’s so weak. All the other forces must play in only three spatial dimensions, while gravity can extend itself out to four, spreading itself much too thin in the process.

Wouldn't this cause gravitational force to fall off with distance using something other than an inverse-square law? I think this explanation would be a better fit for the weak force than gravity for this reason. Thoughts?

More broadly: inverse-square behavior (Gravity, EM etc) strikes me as an intrinsic property of 3D geometry; more so of a tell of dimensionality than the magnitude of the force. (I believe the article is inferring higher dimensionality from relative magnitude, vice distance falloff)

ktrask · 5 months ago
Yes, exactly. That is why we think the extra dimensions might be small, und the inverse square law is only violated at and below the size of the extra dimensions. This is also why we are using the Yukawa Potential to constrain that possibility, because it has a length scale and a strength of a potential deviation from the inverse square law. See also: https://en.wikipedia.org/wiki/Fifth_force
ktrask commented on Why does APT not use HTTPS?   whydoesaptnotusehttps.com... · Posted by u/rishabhd
ktrask · 7 years ago
At a research institute I worked for, we had a proxy server that intercepted http. The antivirus software on the proxy made it impossible to download some security updates once in a while. Fortunately it was possible to change the ubuntu URIs to https:// to use HTTPS and the broken antivirus sofwate did not intervene anymore.
ktrask commented on Physics facts not always taught in school   backreaction.blogspot.com... · Posted by u/monort
platz · 7 years ago
> the idea that any system tries to minimize its energy is just nonsense.

Very interesting, I feel somewhat misled if this is true.

ktrask · 7 years ago
In a closed physical system energy is conserved. For example, if you have container that has Helium on one side and Oxygen on the other. Both gases will mix, i.e. maximize entropy. Minimizing energy would mean, the gas would reach absolute zero.

u/ktrask

KarmaCake day21November 9, 2017View Original