China's Recent Physics Results 'Death Blow to Loop Quantum Gravity'?

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#science #sciencepodcast #physics #theoreticalphysics

[hdufort]

String, MOND, Loop... Every theory gets a beating these days. Maybe we're overdue for some new direction.

[JamaicaWhiteMan]

No, no, you can't kill it. Like string theory, it will just keep coming back in one new Zombie form or another.

[jojogaming]

To my eyes the fact that information becomes so "blurry" in terms of probability near the Planck length is indeed an indication that space-time isn't really a grid, but does act like a "voxelized", "voxelated" surface, or "pixelated" if you look at information on the edge of a black hole and the holographic principle. I think Space-time does have a RESOLUTION in the frame of reference of the observer (actually I think all of space IS the reference frame, US the sentience in the middle of all this information that is our space and time, we, our sentience has to be the frame itself, or at least impossible, to separate). And the fact things seem to become progressively ""blurry" in terms of being determined to exist or not, to me, feels like similar properties to a hologram, like the information of te ENTIRE frame of reference or entire space/time that is supposed to exist outside of any frame of reference is part of the reference frame and it's probabilities, which in the end all depend of the observation of one mind, which would seem to be an accord to one interpretation of quantum mechanics (proved since quite some time now, even more by that quantum eraser experiment).
Hard to explain shortly ideas like that for me in a YouTube comment, but anyway.

[liamweavers]

Whenever we use an instrument to take a measurement, the instrument performs a granular measurement and provides an observable output. As humans, we measure this output, making an observation of the instrument's result rather than the actual event or measurement itself. In this way, we are always one step removed from the real measurement, interacting with the instrument’s interpretation of it, to make our own interpretation of the output. This is why our experience of phenomena, like time, differs from how we observe them. Henri Bergson attempted to explain this distinction to Einstein in 1922, arguing that human experience of time is fundamentally different from its scientific measurement—an idea that was not fully accepted by Einstein at the time.

[mattmiller]

Great job on this interview. You kept steering things in productive directions.

[classicalmechanic]

Gravity is classical. Quantizing gravity is like quantizing the map you use to make measurements thinking the map is real rather than just mathematical tool to describe measurements.

[SamaySanyasi]

Let him face Sabine, Let him answer the question how shortest distance in LQG accommodate length contraction on General theory of relativity.
If LQG is non falsifiable, what are we even doing with it ..

[MichaelMcdonagh-es]

Love the way u explain in a very understanding way..love your explanation 💯 %

[BiswajitBhattacharjee-upvv]

The explanation in this clip is not included that experiments results that has ruled out in observations.
This situation in every field theory as well as loop quantum gravity as Carlo elaborated is flaw or paradox.
As Sabina trying to put it in planck's scale and Lorentz inverience as well as mathematical blurredness of quantum approach is a concern. Is infact a solvable problem as my equations snapshot in the dynamics that even if that planck's square space tend to zero speed of light could be 4C for have quantum interactions with matters of the universe.
Hence the result is satisfactory for SURT-QG when it is damping to vacuum known value of C. This damping is results of 4D structure overall that is the need of modify technology to see this quantum effect as a space-time curvature. As these initiative is already started I have great hope .
Thank you both of you.

[LuvHrtZ]

From the perspective of a photon, or a particle travelling at 99.9999...% of SOL, what we perceive as almost 14 billion years is but an instantaneous flash.

[neanderthalk]

It is quite strange that there is no reference to the experimental results (paper, pre-print, etc.) mentioned at the beginning of the discussion. Anyways, science, including theoretical physics, seems to have become more dogmatic. That is why there are no quantum physics and relativity-like revolutions anymore...

[opd]

From the perspective of Quantum Action Bias (QAB), this debate highlights the nuances between quantum and classical phenomena, particularly in how we interpret the structure of space and gravity. QAB emphasizes that quantum effects can influence macroscopic forces, including gravity, without the need to impose a rigid, grid-like structure on space. This aligns with the critique of earlier suggestions about light being slowed down due to the "granularity" of space.

QAB’s key distinction is that space is not simply a classical grid or lattice, but rather, it is governed by quantum biases that affect how quantum systems behave on different scales. These biases, which arise from quantum fluctuations and uncertainties, can subtly influence phenomena like gravity without violating Lorentz invariance. In QAB, quantum fluctuations are inherent in the fabric of space but are not restricted to a simplistic model of granularity. Instead, they are part of a dynamic, probabilistic structure that adapts based on the quantum and cosmological scales at play.

[SilentAdventurer]

Everything you state is relatively consistent ;) You are right within the current paradigm which derives from human experience. Reality is not bound by human experience. And I am asserting that in reality (not relativistic / QED models that are subject to the mathematical limitations of whatever is en vogue), time has multiple dimensions. One interesting potential outcome of time having multiple dimensions is that the speed of light can then vary around singularities. It can also square the circle or shed light on (puns intended) on inflation and acceleration.

[esasakkinen]

Since the 4-divergence is between time and space, some metric coordinates may have a minimal time dimension or a minimal spatial volume dimension, but not both measured at the same time, according to the uncertainty principle. Individual x-, y-, or z-measurements cannot be separated from the volume measurement due to the covariance of the length contraction. Therefore, searching for the minimum length is pointless.

[aniksamiurrahman]

Denial - first of the five stages of grief.

[avibhagan]

In my personal opinion, something that was never alive can't be killed. 😅

[wohargRadu]

He is really very confusing.
In the beginning he says that they were all excited and wrote papers about how light speed in vacuum should depend on frequency and how this would be a proof of LQG. But towards the end he explains that it is impossible anyway because it would break Lorentz invariance and LQG is (supposed to be) Lorentz invariant.
So what is it ? If LQG is Lorentz invariant, then the "exciting idea" is actually a no go since the start but if the "exciting idea" leads to LQG papers then LQG is not Lorentz invariant.
Something doesn't compute here and you should have asked him about this contradiction.

[JFJ]

What if there is no such thing as 'space' in a fundamental form, but space is nothing but an emergent quality rising from interactions between 'things' in one 'point'?

[MarcusMacgregor]

Back in WW1 a student of H A Lorentz, Johannes Droste, wrote the first paper on black holes. In this paper he noted that black holes repel each other. This causes an interesting effect. Let's say you are out picking black holes. Now if you put two holes in your magic bag they will bounce around rather than form a bigger black hole. Same with 3 holes, but with 4 holes they will tend to form a larger hole. This makes a hole of size 5 impossible. This causes a pattern of expected sizes with numbers like 12, 16 and 20 being favored. This was used by Rutherford to mathematically predict the neutron. QM is derived from GR, always has been.

[egoepvi]

the loop hole about minimal is it's kept vague . My question . Why not call it penultimate of 100% nothing ? Because it bring a clear sandbox of vagueness