These things are not likely. Traversable wormholes require severe
violations of known physics, from no-cloning rule in quantum mechanics to
the basic principles of thermodynamics. These ideas of Kardashev
civilizations are science fiction-fantasies. These things will not happen.
certainly not to humans, because we are dysfunctional and self-destructive.
What happens in the evolutionary scheme to a species that is
self-destructive (think war and nuclear bombs) and dysfunctional? The
probability is large they will go extinct. It is easy to understand.
LC
On Tuesday, January 18, 2022 at 12:14:34 AM UTC-6 spudb...@aol.com wrote:
> My expectation is that wormhole travel is a thing better achieved by a
> Kardashev 2 civilization. The grandchildren's work at intercepting a large
> factor of the emitted solar photons. Oh, those crazy grandkids! The figure
> that I sporadically arrive at is some 40-50 thousand years from now. Since
> I imagine that to do miracles like a transverable wormhole, they are going
> to be rather good at energy production, as well as other dream stuff.
>
> Until then, we and our roboto descendant's have much cosmological research
> to conduct. This will require a quite large budget.
>
> Thx.
> ------------------------------
> On Monday, January 17, 2022 Lawrence Crowell <everyth...@googlegroups.com>
> wrote:
> Sabine Hossenfelder's video is about the warp drive, based on the
> Alcubierre warp solution of the Einstein field equations. Her conclusions
> are more or less on the mark I think. A sub-luminal (slower than light)
> warp drive could work. Even with negative mass-energy if the moduli for
> these fields is compact the vacuum could be stable. However, if it reaches
> the speed of light there occur horizons in the warp bubble that would
> disrupt it by preventing causal communications through it.
>
> The main investigator of this report of a possible warp bubble is Harold
> White, who has a history of being a bit "out there" on things. He also
> advanced the so-called EM drive last decade which was found to not work.
> Why anyone though that would work is beyond me. White has been a big
> exponent of the Alcubierre warp drive. To be fair though, this claimed
> result, is just a calculation of an energy spectra of the Casimir effect
> comparable to what a warp bubble would give, is how Kip Thorne proposes to
> generate wormholes. Wormholes and warp drives share the same energy feature
> with T^{00} < 0, for for a source that is a quantum field 〈0|T^{00}|0〉 < 0.
>
> https://bigthink.com/starts-with-a-bang/no-warp-bubble/
>
> The Casimir vacuum provides the energy conditions required for the warp
> drive. The negative vacuum can be a source for hyperbolic geometry for
> exotic structures such as wormholes and warp drives. This experiment
> employed the Casimir vacuum and came up with results that appear suggestive
> of a warp bubble. This does not though mean we have conclusive evidence of
> one. There are some other reasons to maintain a skeptical perspective on
> this.
>
> The Alcubierre warp bubble is probably only stable for sub-light speed.
> If it is set above the speed of light it has particle horizons that
> causally separate the bubble. This means it is not stable, for Unruh-like
> radiation occurs.
>
> This may lead to deep questions. for the vacuum energy is related to the
> moduli of curves, such as in the Poincare disk and half-plane, and this is
> also in some ways related to the moduli of gauge symmetry. Each curve
> bounds a region, thinking in 2-dimensions, and this region is associated
> with entropy and curvature. For this to work the vacuum has to be stable,
> which means it is Virasoro or CFT_2 or more. I think this imposes this
> limit on the warp bubble as being sub-light speed.
>
> This warp bubble might exist, and for various reasons it would be a
> fascinating development for the foundations of physics. This is not to say
> I think we will be using this for spaceships, at least not at all soon.
> These DARPA results are suggestive, but actual experiments will have to
> rise to what might be called the 5-σ level. I am rather skeptical of this
> however, even though if this is real it would pave the way for a major
> probe of the quantum vacuum.
>
> As for fusion, just getting a fusion powerplant is a big hurdle to jump.
> The Chinese have made an announcement of a fusion device that sustained 15
> million K temperatures for 100 or a 1000 second. I cannot remember which.
> This has a long way to go, and as the joke goes, 20 years from now fusion
> power will still be 20 years in the future. As for a space power or
> propulsion, that is far out. We still do not have fission powered space
> systems or propulsion, and fusion will be far more difficult. The Chinese
> system is fairly large and the ITER program involves a really large
> reactor. Space based systems need to be small and as low mass as possible.
>
> LC
>
> On Saturday, January 15, 2022 at 10:55:58 PM UTC-6 spudb...@aol.com wrote:
>
> So earlier today I watched Sabine hassenfelder the physicist from Germany
> indicate that any kind of wormhole travel or FTL is strictly unlikely. What
> I'd like to ask is, whether all the work that's done today for creating
> commercial nuclear fusion is more or less likely, than using the same
> technology to develop fusion plasma rockets to travel much more swiftly
> within the solar system? Our fusion plasma rockets the lower hanging fruit,
> versus commercial nuclear fusion? Thanks!
> ------------------------------
> On Saturday, January 15, 2022 Lawrence Crowell <
> everyth...@googlegroups.com> wrote:
>
> It is possible for a binary star system to interact with a third star so
> there is an exchange. We do normally expect binary star systems to have
> similarly oriented angular momenta.
>
> This is an interesting result. To compute this would have been tough.
> This is a case of a Robinson-Trautman twisting solution or a twisting type
> N. The addition of the two angular momenta results in the occurrence of
> angular momenta perpendicular to the initial angular momenta. This can be
> seen in with the classical group [L_i, L_j] = ε_{ijk}|L|^2 n_k, for n_k a
> unit vector. This means there is the emission of angular momentum in the
> gravitational radiation. The calculation was most likely done numerically.
>
> LC
>
> On Thursday, January 13, 2022 at 1:13:02 PM UTC-6 johnk...@gmail.com
> wrote:
>
> On Thu, Jan 13, 2022 at 1:37 PM Brent Meeker <meeke...@gmail.com> wrote:
>
>
> * > Kudos to whomever did the calculation for this. But I would have
> thought that most collisions would be misaligned in both spin axes and
> impact plane. The Sun's spin axis isn't aligned with the Milky Way's axis
> of rotation, so I had assumed most stars have randomly directed spin axes.*
>
>
> Stars do have random axis of rotations in general but not if you're
> talking about double stars, and the sun is rather unusual in being only a
> single star, most stars are double stars, and they were created at the same
> time from the same rotating cloud of gas and dust and thus have similar
> axis of rotation, so when the resulting stars turned into Black Holes they
> would also have similar axes. And indeed most of the Black Hole mergers
> so far detected by gravitational waves have been of that sort, but not this
> one, that's what makes it so unusual. This system must've been formed by
> two stars that formed at different places at different times but then got
> close together and somehow went into orbit around each other.
>
> John K Clark See what's on my new list at Extropolis
> <https://groups.google.com/g/extropolis>
> qbj
>
>
> Brent
>
> On 1/13/2022 3:49 AM, John Clark wrote:
>
> For the first time a sort of gravitational wave rocket has been found. By
> re-examining the data from the LIGO and Virgo gravitational wave
> observatories researchers report on January 6 they have detected the merger
> of 34 and 29 solar mass Black Holes that resulted in a Black Hole of about
> 62 solar masses with about one solar mass being converted into
> gravitational waves. What makes this merger unusual is that it was not
> symmetrical, the axis of spin of the 2 black holes were not aligned with
> each other and neither was aligned with the axis of orbit around each
> other. This would indicate that the 2 stars that form them (assuming these
> 2 large Black Holes were actually formed from the corpses of dead stars) we
> re not born in an isolated system but probably came from a denser
> environment like a globular cluster. Even more interesting is that the
> misalignment of the spins means that the gravitational waves emitted were not
> emitted symmetrically, and gravitational waves carry some linear momentum.
> So the resulting 62 Solar mass Black Hole must've received a pretty
> substantial kick causing it to move pretty fast, and that's just what the
> researchers found, because of that kick the huge 62 solar mass Black Hole
> started moving at least 700 km a second and probably closer to 1500. It's
> probably moving fast enough to escape whatever galaxy it was in.
>
> Evidence of large recoil velocity from a black hole merger signal
> <https://arxiv.org/pdf/2201.01302.pdf>
>
>
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