Holography is a technique which enables a wavefront to be recorded and later re-constructed. Holography is best known as a method of generating three-dimensional images but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave.
A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium. When only the second wavefront illuminates the interference pattern, it is diffracted to recreate the original wavefront. Holograms can also be computer-generated by modelling the two wavefronts and adding them together digitally. The resulting digital image is then printed onto a suitable mask or film and illuminated by a suitable source to reconstruct the wavefront of interest.
this paper
arXiv:2310.02958 [pdf, other]
What if Quantum Gravity is "just'' Quantum Information Theory?
Aron C. Wall
Comments: 6 pages, 2 figures. Additional references added to arxiv version
Journal-ref: Proc. 28th Solvay Conf. Phys., ed. D. Gross, A. Sevrin, P. Zoller, World...
Good morning,
I am developing an experiment on how to study the kinetics of etching/erasure of holographic lattices in a photorefractive material and I have some doubts about the procedure to follow. I have a single-mode He-Ne laser with monochromatic light of wavelength 632.8 nm and the...
Many of us have heard of "twistors", arguably Roger Penrose's biggest contribution to theoretical physics. Twistor space is a space which maps nonlocally onto physical space-time; in particular, lightlike structures in space-time, like null lines and light cones, become much more "local" in...
I'm trying to understand how optical holography works. I made a hologram using LitiHolo C_RT20 instant develop hologram film and am now trying to understand how this actually works. It almost makes sense to me. What I'm having trouble understanding, however, is this:
Reference wave + object wave...
This should maybe go in the Beyond The Standard Model forum but since it's a paper about quantum cosmology I'll put it here. Feel free to move it if it's too speculative but that's exactly my question. That is: if it is...
Perusing
"The Area of a Rough Black Hole"
- -...
Hi PF!
I am interested to know whether there are applications of holography in telecommunications, and if there is research on this topic. If there is some literature on this topic (provided holography is used in computer networking) where I can read and learn more in-depth about this topic, I...
What part of double slit mystery remains considering single slit can produce interference pattern as well? Does holography not fully explain those patterns behind any number of slits as a sort of "encoded image" of the slit(s)?
Does the word "focus" have any meaning in these kinds of experiments?
How do you understand the world "holographic"?
Is it not it is about every part is included in other part and vice versa. If you take a piece of image of holography, the part of the entire thing is within any other part.
How best to phrase the above?
There is another definition that...
In a recent study (https://phys.org/news/2018-08-flaw-emergent-gravity.html) it has been discovered an important flaw in Emergent/Entropic Gravity because it has been discovered that holographic screens cannot behave according to thermodynamics...
But then, doesn't this also invalidate...
Hi! Sorry for my bad English!
I don't know much of physics, I know some experiments that show that relativity is real, quantum entanglement, particle and wave duality and so on...
So, the only theory that explain all of it mathematically is M theory and the strings, but we can never test it to...
Dear all,
I'm a bit confused about non-relativistic applications of holography, like e.g. in
https://arxiv.org/pdf/0812.0530v1.pdf
and
https://arxiv.org/abs/1306.0638
In these papers people try to connect holographically non-relativistic condensed matter systems, like the Quantum Hall...
I have the following optical setup, in which the goal is to record the diffraction pattern of a sample on an image detector some distance away. In this particular case, the sample is sitting on a standard microscope glass slide.
Now, after recording the diffraction pattern, I numerically...
What are prerequisite courses/topics to better understand holography as applied to strongly correlated condensed matter systems? Any references/textbooks would be appreciated. I'm doing research on this topic and would like my understanding to improve.
Thanks very much
To make a hologram a film is exposed to an incident plane wave and wave from the object to record the interference pattern on the film. The principle is commonly explained in a way like that in p.1212 of "University Physics" (...
http://arxiv.org/abs/1507.00591
AdS/CFT without holography: A hidden dimension on the CFT side and implications for black-hole entropy
H. Nikolic
(Submitted on 2 Jul 2015)
We propose a new non-holographic formulation of AdS/CFT correspondence, according to which quantum gravity on AdS and its...
I am very curious about holograms and if there is a possible way to project 3D , mid-air images and videos on air with no holographic screen (The Princess Leia hologram in Star Wars). If it is not possible, how long till they actually start arriving to the world and how will they work/operate?
The title above give my name. I am a pure maths PhD with an interest in physics and geometry. I am currently studying physics for fun and I am very interested in current progress.
I am especially interested in quantisation of space time, holographic theories and dualities.
Regards
John
Hi everybody,
first time post/question, hope you're kind with me :)
I got a somewhat detailed question about holography:
Obviously the very point of holography is to recreate the wavefronts correctly towards the viewer, as in this picture
(thanks to Wikipedia)
My question is, are the...
I studied string theory for 2 years officially and much more on my own, chance made it that I spent the last year reading "serious" algebraic topology books and differential geometry specific for mathematicians. After gaining this insight I am very skeptical about string theory and the...
Hi all,
Next period I'll be taking a course which focuses on holography this year (it's a different course every year pertaining to some (very/reasonably) active field in theoretical physics).
We have gotten some links to course materials we'll be dealing with
(1) The gauge/gravity...
This was just posted on arxiv. It seems to be of general interest so here's a thread in case anyone wants to discuss it.
http://arxiv.org/abs/1308.1977
Holography without strings?
Donald Marolf
(Submitted on 8 Aug 2013)
A defining feature of holographic dualities is that, along with the bulk...
Part of my basic understanding of the holographic principal is that the amount information in a given area of space is less than the surface area that surrounds that region (measured in Planck units squared). The exception being that in the case of a black hole the information stored within an...
Having trouble wrapping my head around holography after watching/reading a ton of stuff on the topic. What I think I have found to be true is that real holograms are 3D images captured onto film that are able to be viewed at any angle through the naked eye.
So the concept of a 3d image or...
I hear the statement that global symmetries in the boundary field theory corresponds to gauge symmetries in the bulk.
1) Is this a generic statement that is expected to hold for all holography pairs? (Maldacena states this towards the end of his first lecture at PiTP2010, which was supposed to...
Hi, I'm an aspiring SF writer, and had a question about holography. Do you think holography can advance to the point where it can accurately reproduce the colors, hues, and brushstrokes of oil paintings? For instance, if the Mona Lisa is scanned, frame and all, it could appear to hang on the...
I'm really having trouble understanding how holograms work in a good enough way to explain it. I know it captures an interefernce pattern of two incoming waves in the form of a complicated diffraction grating. When the reference beam shines on to the plate the original object is created. But...
Holography separates the space of non-gravity (gauge) and gravity (string) theories into boundary and bulk. As I see it, CY compactifications do no such separations. So, aren't they fundamentally inconsistent with each other?
I also see more and more string theorists starting to believe in the...
Given the recent discussion about a possible formulation of holographic principle, and also what geometric notions suchs distance and area may mean without prior metric I thought I'd throw in this suggestive comparasion out for discussion. I feel the discussion is still too much tied to...
Please explain the difference between holography and holograms. I have to do an assignment on holography, but should I research holograms aswell.
Thanks
I didn't notice this paper, until it was featured today on TR:
http://www.technologyreview.com/blog/arxiv/25214/?ref=rss
http://arxiv.org/abs/1005.3537
MONDian Dark Matter
Chiu Man Ho, Djordje Minic, Y. Jack Ng
(Submitted on 19 May 2010)
We provide a holographic dual description...
Light-Front Holography
Will this approach generate any interest?
http://arxiv.org/abs/0804.0452
Light-Front Dynamics and AdS/QCD Correspondence: Gravitational Form Factors of Composite Hadrons
Authors: Stanley J. Brodsky, Guy F. de Teramond
(Submitted on 3 Apr 2008)
The people that are interested in Holography and dark energy probably know better than me on how to search for papers on Holographic dark energy.
The following papper discusses ALL dark energy models EXCEPT Holography Dark Energy.
This thread is related to We are in a Schwarzschild black...
Holography in LQG--new result by Gambini and Pullin
http://arxiv.org/abs/0708.0250
Holography in spherically symmetric loop quantum gravity
Rodolfo Gambini, Jorge Pullin
5 pages
(Submitted on 2 Aug 2007)
"We show that holography arises naturally in the context of spherically symmetric loop...
I would just like to know three mistakes students might make in recording and processing their holograms that would result in a poor or nonexistent hologram and please explain why? Thank you very much to those who reply in advanced!
after applying Fourier transform on the interference picture i get from the object ray and the reference ray (which i captured with a high definition CCD), i can see the object again... but it doesn't look like a hologram to me... its pretty 2d dimensional looking... my guess is that my...
Would someone, PLEEEEAAAASSSEEE, explain here how holography actually works.
...I mean - I know (I've already read about it times and times again) - I know it has to do with interference patterns (interaction between two components of light (object and reference light)), I see it has to do...
Can anyone suggest a good place to look for upcoming conferences and/or workshops pertaining to aspects of black hole thermodynamics and the holographic principle?
In fact, what are some good "central repositories" for conference postings? LANL used to have one, but it frequently got out of...