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originally posted by: PuppyloveAbsurdity. Having one's skull crushed into a pancake will kill a person 100 percent of the time. Physical reality exists. The only question is how. No amount of philosophy will make a bullet magically not wound you.
originally posted by: Puppylove
a reply to: schuyler
So are there things we still don't understand or have yet to figure out? Sure there are plenty, but none of that suddenly negates physical reality, nor does it bring it's existence into question in any way that's actually helpful or useful.
originally posted by: schuyler
I have heard this basic theme for fifty years now. "Reality is all in your head." "Time doesn't exist." And people go around talking as if they understand what those things mean. "There is no time." Really? "Science has shown mathematically that everything happens at the same time." Is that right? OK, then. How does this help me? What can I do to manipulate this information to my advantage?
originally posted by: Puppylove
a reply to: schuyler
The absurdity is saying physical reality doesn't exist. It clearly does, so can we try understanding it and not make absurd statements? We can both move forward with science and researching the unknown without having to pretend nothing is real.
originally posted by: neoholographic
3. Holographic Principle
Most Physicists are beginning to accept some form of the Holographic Universe. This has serious implications when it comes to the nature of reality. A holographic universe would show that 3D volume doesn't exist. Whar we call volume is a projection of information on a 2D surface area. Here's a video with Susskind and others.
originally posted by: Thecakeisalie
a reply to: neoholographic
We make our own reality sometimes.
Take time for example-it's a human construct-time is equated by velocity and distance, if your watch stopped during the night, does that mean the sun won't rise in the morning?
originally posted by: ColeYounger
This stuff always makes me think of Einstein's statement that "Reality may be an illusion, but it's a persistent illusion."
Time is NOT real: Physicists show EVERYTHING happens at the same time
That's just too heavy to wrap one's mind around.
The new theory embraces the strange concept that the universe is like a vast and complex hologram. In other words, 3D reality is an illusion, and that the apparently "solid" world around us - and the dimension of time - is projected from information stored on a flat 2D surface. Hawking and Hertog's variation of the holography theory overcomes the problem of combining eternal inflation with General Relativity.
Applied to inflation, the newly published theory suggests that time and "the beginning" of the universe arose holographically from an unknowable state outside the Big Bang.
(Submitted on 29 Jan 2019)
We study the phenomenology of a recent string construction with a quantum mechanically stable dark energy. A mild supersymmetry protects the vacuum energy but also allows O(10−100) TeV scale superpartner masses. The construction is holographic in the sense that the 4D spacetime is generated from "pixels" originating from five-branes wrapped over metastable five-cycles of the compactification. The cosmological constant scales as Λ∼1/N in the pixel number. An instability in the construction leads to cosmic expansion. This also causes more five-branes to wind up in the geometry, leading to a slowly decreasing cosmological constant which we interpret as an epoch of inflation followed by (pre-)heating when a rare event occurs in which the number of pixels increases by an order one fraction. The sudden appearance of radiation triggers an exponential increase in the number of pixels. Dark energy has a time varying equation of state with wa=−3Ωm,0(1+w0)/2, which is compatible with current bounds, and could be constrained further by future data releases. The pixelated nature of the Universe also implies a large-l cutoff on the angular power spectrum of cosmological observables with lmax∼O(N). We also use this pixel description to study the thermodynamics of de Sitter space, finding rough agreement with effective field theory considerations.
(Submitted on 13 Dec 2018 (v1), last revised 19 Dec 2018 (this version, v2))
In this paper, we present a model for the late-time evolution of the universe where a dark energy-dark matter interaction is invoked. Dark energy is modeled through an holographic Ricci dark energy component. The model is embedded within an induced gravity brane-world model. For suitable choices of the interaction coupling, the big rip and little rip induced by the holographic Ricci dark energy, in a relativistic model and in an induced gravity brane-world model, are removed. In this scenario, the holographic dark energy will have a phantom-like behaviour even though the brane is asymptotically de Sitter.
(Submitted on 29 Nov 2018)
We compute the holographic entanglement entropy contribution from planar two-dimensional defects in six-dimensional N=(2,0) superconformal field theory, holographically dual to probe M2- and M5-branes in AdS7×S4. In particular, we test the viability of the universal contribution of the defect to entanglement entropy as a candidate C-function. We find that this coefficient is not monotonic under defect renormalization group flows triggered by the vacuum expectation value of a marginal operator. Another candidate C-function, the on-shell action inside the entanglement wedge, monotonically decreases under the flows we study.