PR80 (Ace #72) In the caves of the Druuf

Perrypedia link:

<https://www-perrypedia-de.translate.goog/wiki/In_den_H%C3%B6hlen_der_Druuf?_x_tr_sl=de&_x_tr_tl=en>

This adventure's set on a planet called Roland. Previously posted
parallels (by authorial intention or otherwise) to Roland's horn
Olifant are available here:

<https://rec.arts.sf.written.narkive.com/AvqRC9JP/ot-sf-mythology#post7>

In this PR episode, Perry uses gravity waves to send an S.O.S. signal.
Near the bottom of the above link there's also an anecdote about walking
on eggshells in order to enlighten Einstein's ego after Albert
erroneously said gravity waves do not exist. It turns out such a
statement contradicts Einstein's own theory.

This novella continues to exposit hyperspace. Poe's prose poem _Eureka_
anticipates hyperspace. Pilot wave theory incorporates hyperspace into
its metaphysical framework. Both are covered here:

<https://rec.arts.sf.written.narkive.com/XrVRpBCj/hyperspace-from-poe-to-pilot-to-perry#post2>

Feynman put forth a hot plate metaphor for the curvature of spacetime.
And Ouspensky provides suitable dimensional nomenclature. Both concepts
can be viewed here:

<https://rec.arts.sf.written.narkive.com/nKdzKYQL/the-bonds-of-eternity-perry-rhodan-69-by-clark-darlton#post2>

A basic understanding of tensors is necessary to continue beyond this
point. Dan Fleisch provides an adequate introduction in his short
"What's a Tensor?" video:

<https://www.youtube.com/watch?v=f5liqUk0ZTw>

With all of the preliminaries now out of the way, it's time to ponder
something new and old: Einstein Field Equations (EFE). It took Albert
ten years to develop EFE to describe the spacetime curvature of
hyperspace.
    He did all of the hard work. As an aside, Sabine Hossenfelder

<https://duckduckgo.com/?q=sabine+hossenfelder+einstein&iax=videos&ia=videos>

says EFE are fairly easy to understand, relatively speaking.

Einstein Field Equation: Learn its Definition and Derivation
<https://testbook.com/physics/einstein-field-equation>

Einstein Field Equations Fully Written Out: What Do They Look Like Expanded?
<https://profoundphysics.com/einstein-field-equations-fully-written-out-what-do-they-look-like-expanded/>

Danke,

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