Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
There was an article published on Monday over a survey on whether the holographic principle could survive in either flat or curved space. They ran the survey twice and the spirit of the lamp augered, yes. And it kind of fits into digitalist physics, philosophy, plumbing. -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Tue, Apr 28, 2015 9:08 pm Subject: Re: Could the Holographic principle apply to our ever so slightly positively curved universe? On 29 April 2015 at 11:05, spudboy100 via Everything List everything-list@googlegroups.com wrote: You could like include this work by the U of Vienna, to Steinhart's Promotion theory of information transfer. The nice thing is that curved or flat or square, the digitalism still works no matter what the shape of space is. Also holographic theory seems to suggest an underpinning of computation, from 2D to 3D. Which work? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
Fermilab is constructing a device called a Holometer and if we're lucky it may be able to tell us if spacetime is quantized and show us if the Planck Length and the Planck Time really do mean something in physics. https://www.youtube.com/watch?v=8HqEaPKZ7fs John K Clark -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
On 29 April 2015 at 13:27, meekerdb meeke...@verizon.net wrote: On 4/28/2015 3:02 PM, LizR wrote: Thanks. I'd be interested to know if this continues to pan out for other phenomena apart from the entropy of entanglement. I believe the original version (with anti-deSitter space) allows quite a lot of phenomena that are intractable in one formulation to be worked out in the complementary one, so I hope this result will eventually lead to the solution of problems that are currently intractable in flat spacetime, preferably solutions to questions posed by quantum gravity about black holes etc. And a related paper: *Universality of Gravity from Entanglement* *Brian Swingle, Mark Van Raamsdonk* *(Submitted on 12 May 2014)* *The entanglement first law in conformal field theories relates the entanglement entropy for a ball-shaped region to an integral over the same region involving the expectation value of the CFT stress-energy tensor, for infinitesimal perturbations to the CFT vacuum state. In recent work, this was exploited at leading order in N in the context of large N holographic CFTs to show that any geometry dual to a perturbed CFT state must satisfy Einstein's equations linearized about pure AdS. In this note, we investigate the implications of the leading 1/N correction to the exact CFT result. We show that these corrections give rise to the source term for the gravitational equations: for semiclassical bulk states, the expectation value of the bulk stress-energy tensor appears as a source in the linearized equations. In particular, the CFT first law leads to Newton's Law of gravitation and the fact that all sources of stress-energy source the gravitational field. In our derivation, this universality of gravity comes directly from the universality of entanglement (the fact that all degrees of freedom in a subsystem contribute to entanglement entropy). * As a bear of little brain, I may have to wait for the popular science book. (Unless someone can summarise the result for dummies?) -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
Do you have a link? On 30 April 2015 at 00:20, spudboy100 via Everything List everything-list@googlegroups.com wrote: There was an article published on Monday over a survey on whether the holographic principle could survive in either flat or curved space. They ran the survey twice and the spirit of the lamp augered, yes. And it kind of fits into digitalist physics, philosophy, plumbing. -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Tue, Apr 28, 2015 9:08 pm Subject: Re: Could the Holographic principle apply to our ever so slightly positively curved universe? On 29 April 2015 at 11:05, spudboy100 via Everything List everything-list@googlegroups.com wrote: You could like include this work by the U of Vienna, to Steinhart's Promotion theory of information transfer. The nice thing is that curved or flat or square, the digitalism still works no matter what the shape of space is. Also holographic theory seems to suggest an underpinning of computation, from 2D to 3D. Which work? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
On 30 April 2015 at 04:52, John Clark johnkcl...@gmail.com wrote: Fermilab is constructing a device called a Holometer and if we're lucky it may be able to tell us if spacetime is quantized and show us if the Planck Length and the Planck Time really do mean something in physics. https://www.youtube.com/watch?v=8HqEaPKZ7fs I can't watch that right now but it sounds interesting. Is this an attempt to measure the granularity of space-time, or something similar? If I understand correctly, the holographic principle implies that the resulting hologram should have a pixel size (which I imagine may depend on the distance to the boundary ... which may mean everything slowly fuzzes out as the universe expands???) -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
You could like include this work by the U of Vienna, to Steinhart's Promotion theory of information transfer. The nice thing is that curved or flat or square, the digitalism still works no matter what the shape of space is. Also holographic theory seems to suggest an underpinning of computation, from 2D to 3D. -Original Message- From: LizR lizj...@gmail.com To: everything-list everything-list@googlegroups.com Sent: Tue, Apr 28, 2015 6:02 pm Subject: Re: Could the Holographic principle apply to our ever so slightly positively curved universe? Thanks. I'd be interested to know if this continues to pan out for other phenomena apart from the entropy of entanglement. I believe the original version (with anti-deSitter space) allows quite a lot of phenomena that are intractable in one formulation to be worked out in the complementary one, so I hope this result will eventually lead to the solution of problems that are currently intractable in flat spacetime, preferably solutions to questions posed by quantum gravity about black holes etc. PS The take home result is that my bottom only LOOKS big, but is actually flat :-) -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
On 29 April 2015 at 11:05, spudboy100 via Everything List everything-list@googlegroups.com wrote: You could like include this work by the U of Vienna, to Steinhart's Promotion theory of information transfer. The nice thing is that curved or flat or square, the digitalism still works no matter what the shape of space is. Also holographic theory seems to suggest an underpinning of computation, from 2D to 3D. Which work? -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
On 4/28/2015 3:02 PM, LizR wrote: Thanks. I'd be interested to know if this continues to pan out for other phenomena apart from the entropy of entanglement. I believe the original version (with anti-deSitter space) allows quite a lot of phenomena that are intractable in one formulation to be worked out in the complementary one, so I hope this result will eventually lead to the solution of problems that are currently intractable in flat spacetime, preferably solutions to questions posed by quantum gravity about black holes etc. And a related paper: /Universality of Gravity from Entanglement// //Brian Swingle, Mark Van Raamsdonk// //(Submitted on 12 May 2014)// // //The entanglement first law in conformal field theories relates the entanglement entropy for a ball-shaped region to an integral over the same region involving the expectation value of the CFT stress-energy tensor, for infinitesimal perturbations to the CFT vacuum state. In recent work, this was exploited at leading order in N in the context of large N holographic CFTs to show that any geometry dual to a perturbed CFT state must satisfy Einstein's equations linearized about pure AdS. In this note, we investigate the implications of the leading 1/N correction to the exact CFT result. We show that these corrections give rise to the source term for the gravitational equations: for semiclassical bulk states, the expectation value of the bulk stress-energy tensor appears as a source in the linearized equations. In particular, the CFT first law leads to Newton's Law of gravitation and the fact that all sources of stress-energy source the gravitational field. In our derivation, this universality of gravity comes directly from the universality of entanglement (the fact that all degrees of freedom in a subsystem contribute to entanglement entropy). // // // arXiv:1405.2933v1 [hep-th] / Brent -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
Re: Could the Holographic principle apply to our ever so slightly positively curved universe?
Thanks. I'd be interested to know if this continues to pan out for other phenomena apart from the entropy of entanglement. I believe the original version (with anti-deSitter space) allows quite a lot of phenomena that are intractable in one formulation to be worked out in the complementary one, so I hope this result will eventually lead to the solution of problems that are currently intractable in flat spacetime, preferably solutions to questions posed by quantum gravity about black holes etc. PS The take home result is that my bottom only LOOKS big, but is actually flat :-) -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
RE: Could the Holographic principle apply to our ever so slightly positively curved universe?
The 'holographic principle,' the idea that a universe with gravity can be described by a quantum field theory in fewer dimensions, has been used for years as a mathematical tool in strange curved spaces. New results suggest that the holographic principle also holds in flat spaces. Our own universe could in fact be two dimensional and only appear three dimensional -- just like a hologram. The holographic universe hypothesis has been around for a while (since Juan Maldacena proposed it in 1997); what is interesting in this news, is that it has been shown to be possible for a universe with flat or positive spacetime curvatures, as opposed to just the exotic negative spacetime curvature (anti-de-sitter-space) http://www.sciencedaily.com/releases/2015/04/150427101633.htm However, Grumiller has suspected for quite some time that a correspondence principle could also hold true for our real universe. To test this hypothesis, gravitational theories have to be constructed, which do not require exotic anti-de-sitter spaces, but live in a flat space. For three years, he and his team at TU Wien (Vienna) have been working on that, in cooperation with the University of Edinburgh, Harvard, IISER Pune, the MIT and the University of Kyoto. Now Grumiller and colleagues from India and Japan have published an article in the journal Physical Review Letters, confirming the validity of the correspondence principle in a flat universe. -- You received this message because you are subscribed to the Google Groups Everything List group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
