Possibly dumb question, but I know my niece is going to ask me about this, and I'd like to be able to give her a solid response: does this mean that most distances within our universe are illusory? If not, why not? To expand on that thought a little bit, with a hologram, the projected object is an illusion, and can be made to appear to move at arbitrary speed by e.g. rotating the projection apparatus. On a larger sca…
Is this the real-life equivalent to Plato's Allegory of the Cave [1]? I wonder if books like Zelazny's Amber series will seem, in retrospect, more insightful. [1] https://en.wikipedia.org/wiki/Allegory_of_the_Cave
Study reveals substantial evidence of holographic universe
121–130 of 197 posts
Re: Study reveals substantial evidence of holographic universe
#122Earlier quoted context omitted.
I thought that in order for a holographic universe to exist, then the universe needs to have a non-flat e.g. slightly-curved spacetime; in order to "close the boundary", so to speak. But my understanding is that so far all our evidence shows that spacetime is flat? i.e. we spacetime needs to be an Anti-de Sitter space. https://en.wikipedia.org/wiki/Anti-de_Sitter_space But I didn't think many actually think we live i…
Couldn't the amount of curve within our observable universe be less than the margin of error in our methods of observation?
Re: Study reveals substantial evidence of holographic universe
#123Shitty scientific journalism. Abstract says something else but who cares.
>We test a class of holographic models for the very early Universe against cosmological observations and find that they are competitive to the standard cold dark matter model with a cosmological constant (ΛCDM) of cosmology. These models are based on three-dimensional perturbative superrenormalizable quantum field theory (QFT), and, while they predict a different power spectrum from the standard power law used in ΛCDM, they still provide an excellent fit to the data (within their regime of validity). By comparing the Bayesian evidence for the models, we find that ΛCDM does a better job globally, while the holographic models provide a (marginally) better fit to the data without very low multipoles (i.e., l≲30), where the QFT becomes nonperturbative. Observations can be used to exclude some QFT models, while we also find models satisfying all phenomenological constraints: The data rule out the dual theory being a Yang-Mills theory coupled to fermions only but allow for a Yang-Mills theory coupled to nonminimal scalars with quartic interactions. Lattice simulations of 3D QFTs can provide nonperturbative predictions for large-angle statistics of the cosmic microwave background and potentially explain its apparent anomalies."
So, basically, the holographic models seem to be pretty good, in the areas where it is perturbative (roughly l>30), it appears to fit slightly better than the current theories ("lambda CDM" models). The paper can rule out some of the holographic models because they don't fit the data, while other models fit great. Finally, the non-perturbative holographic models (roughly lThis seems to be pretty close to what the article says...
Re: Study reveals substantial evidence of holographic universe
#124Earlier quoted context omitted.
This and Godel's Incompleteness (equivalently the halting problem) and entropy (which gives the "arrow of time") I always find endlessly strange.
what about human consciousness?
Re: Study reveals substantial evidence of holographic universe
#125Re: Study reveals substantial evidence of holographic universe
#126Re: Study reveals substantial evidence of holographic universe
#127Earlier quoted context omitted.
And there you go... there's the answer to everything. A black hole on one side and, on the other side (the side we don't know), there's a whole new universe being sprung up. Each input goes to the output of a different black/white hole combo.
Tempting, but there's no evidence to support that.
Re: Study reveals substantial evidence of holographic universe
#128You cannot code a particle simulator that perfectly mimics 3D space despite each particle only having two spatial location variables. We all have that new agey friend on FB who will inevitably share this nonsense. Do we really need to be dealing with it on HN? What's next, Minion memes?
There is a very well developed model of how this relationship could work in a simpler case. I suggest you have a look at this wikipedia page: https://en.wikipedia.org/wiki/AdS/CFT_correspondence
Hopefully this mathematical model will convince you that the holographic principle is, at the very least, more mature than a minion meme.
Re: Study reveals substantial evidence of holographic universe
#129It's crazy to think we are the universe observing and trying to understand itself. Matter organised in a certain way is able to observe itself? How weird is that!
"And what completes our incapability of knowing things, is the fact that they are simple, and that we are composed of two opposite natures, different in kind, soul and body. For it is impossible that our rational part should be other than spiritual; and if any one maintain that we are simply corporeal, this would far more exclude us from the knowledge of things, there being nothing so inconceivable as to say that matter knows itself. It is impossible to imagine how it should know itself.
"So if we are simply material, we can know nothing at all; and if we are composed of mind and matter, we cannot know perfectly things which are simple, whether spiritual or corporeal. ...
"Who would not think, seeing us compose all things of mind and body, but that this mixture would be quite intelligible to us? Yet it is the very thing we least understand. Man is to himself the most wonderful object in nature; for he cannot conceive what the body is, still less what the mind is, and least of all how a body should be united to a mind. This is the consummation of his difficulties, and yet it is his very being. Modus quo corporibus adhærent spiritus comprehendi ab hominibus non potest, et hoc tamen homo est. [The manner in which spirits are united to bodies cannot be understood by men, yet such is man---Augustine]."
Re: Study reveals substantial evidence of holographic universe
#130Earlier quoted context omitted.
Tempting, but there's no evidence to support that.
Indeed, but there is research underway to find evidence: > https://arxiv.org/abs/1105.2776
Even if the Big Bang was a continuous long-lasting process of energy/matter appearing, wouldn't the effects of General Relativity make it look like, from the perspective of observers later on within the Universe, that all the energy/matter appeared instantaneously?