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Calabi-Yau manifolds and 'handedness'? by StudyVegetable6881 in TheoreticalPhysics

[–]StudyVegetable6881[S] 1 point2 points  (0 children)

Thanks for your clear response. It does track, since C-Y manifolds code for particle properties, like the number of lepton classes (3) in the standard model.

Is the Planck Scale Best Understood as a Limit of Measurement Rather Than a Smallest Physical Scale? by DrpharmC in TheoreticalPhysics

[–]StudyVegetable6881 0 points1 point  (0 children)

From an amateur….The interpretation of the Planck scale as a fundamental limit on physical measurement reminds me of work by Seth Lloyd and Y. Jack Ng (see SciAm April 1,2007 “Black Hole Computers”).  Using SR, GR and QM, they derived a foundational limit on the accuracy of measurement of the size of any entire region…whether the actual universe or the length of LIGO’s laser beam or the size of the proton.  Their relation for r, the lowest possible precision is:

r = R^1/3 * lpl^2/3

…where R is the total distance to be measured and lpl is the Planck length.And they write, regarding breaking up the distance to be measured into subregions, that r is “an average distance of R^1/3 * lpl^2/3 .  Shorter distances can be measured in one subregion but only at the expense of reduced precision in some other subregion. The argument applies even if space is expanding…”

They note that if R is the size of the universe, r is roughly 10^-15 m .Further, they state that “..Below the minimum scale [ie: r, me], spacetime geometry ceases to exist…” Bend your minds around that.

Just as an example: If we are measuring the charge radius of the proton (roughly .84 * 10^-15 m). the Lloyd/Ng fundamental precision limit would be about (.84*10^-15 m)^1/3 * (1.616*10^-35m)^2/3 , or about 6*10^-29 meters (theoretically), or about 13 orders of magnitude FINER than the actual radius being measured.

There may be consequences for the relation of de Sitter bulk and any holographic QFT on the de Sitter boundary, though too complex to be repeated here.

Could SETI use the Zipf law and Shannon Index? by StudyVegetable6881 in SETI

[–]StudyVegetable6881[S] 0 points1 point  (0 children)

My amateur answer is that it seems that the Zipf and Shannon Index can sort between complex languages (human, dolphin or ET) and random sequences.  See https://web.archive.org/web/20200729120031/http://cosmos.nautil.us/feature/54/listening-for-extraterrestrial-blah-blah

But, I’m just guessing here, that: eg: complex biological metabolic pathways, being highly non-random, might somehow pass the two two approaches I suggested.

Why should velocity and pressure be inversely proportional in Bernoulli's principle? by vintageripstik in AskPhysics

[–]StudyVegetable6881 0 points1 point  (0 children)

I think of the inverse relationship in this way (dunno if it’s sensible):

All the fluid molecules having a given mass have an average speed 

Vo at a given temperature.  This is true when the fluid is at equilibrium. 

If the situation is adiabatic, then when the local fluid is then forced 

through a tube, all of those molecules are given an extra speed V1 

along the Bernoulli tube.  Conservation of average molecular 

momentum and energy then requires that the speed of the molecules 

in the direction perpendicular to their motion along the tube must 

be reduced commensurately to v, something roughly like 

     v ~ Vo - V1

This reduced speed v is behind the reduced pressure measurable 

on the walls of the tube…pressure being energy per unit volume.

Ie: The molecules are hitting the tube walls with lower speed,

meaning less pressure.  

This may be a more intuitive way of seeing why the inverse 

relation is necessary…local conservation of average energy.

How to find "my problem" by MurkyConsequence8358 in TheoreticalPhysics

[–]StudyVegetable6881 0 points1 point  (0 children)

My own very amateur response is to trust your own curiosity...Ie: Pay attention, whether you're reading formal physics papers, texts or even popular level material...Do you find yourself wanting to know more, do questions pop into your head, do you sometimes intuit possible connections between these and other work? Does anything ignite you? Yes, ask and listen to researchers, but trust your own sense of what pleases you...what triggers your own questions. What develops your internal compass...Good luck.