The information tag has no wiki summary.
2
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0answers
45 views
Estimating the Kolmogorov Complexity of the Standard Model
The Kolmogorov complexity of a hypothesis / theory / model is the shortest computer program that simulates it, regardless of how inefficient executing that program may be in terms of memory and time. ...
5
votes
2answers
115 views
Why isn't data lost when sent over large distances?
I was thinking about how information is sent, for example through the atmosphere. There are plenty of obstacles, as well diffraction, etc.
Still, no information is lost. How is information sent to ...
4
votes
1answer
144 views
Maximum theoretical bandwidth of fibre-optics
Ignoring hardware at either end and their technological limitations, what is the maximum theoretical bandwidth of fibre optic cables currently in use / being deployed in a FTTH type situations? I ...
6
votes
2answers
93 views
What is the real-world significance of the Bekenstein bound?
The Bekenstein bound sets the maximum amount of information that can be contained in a region of space/energy, and is usually referred to in the same way as computer storage density:
For example, ...
3
votes
2answers
540 views
About Susskind's claim “information is indestructible”
I really can't understand what Leonard Susskind means when he says that information is indestructible.
Is that information really recoverable?
He himself said that entropy is hidden information. ...
1
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0answers
27 views
Information-theoretic limits in observational astronomy
It seems to me that with ever larger and better telescopes and powerful statistical methods, humans are gleaning surprising amounts of information from observations of distant stars. I am especially ...
2
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1answer
94 views
Reconstruction of the initial state from Hawking radiation?
I hear that unitary evolution and information conservation must imply that information about information content that defines the initial state of matter used to create a black hole can be inferred ...
3
votes
2answers
190 views
Quantum Teleportation Fidelity
I understand that quantum teleportation fidelity is the overlap of the initial quantum state with the teleported quantum state. If the teleportation is perfect, then the fidelity would equal 1 or 100% ...
22
votes
4answers
948 views
What is information?
We're all familiar with basic tenants such as "information cannot be transmitted faster than light" and ideas such as information conservation in scenarios like Hawking radiation (and in general, ...
0
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0answers
44 views
0
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0answers
16 views
OAM states in communications [duplicate]
Possible Duplicate:
OAM states for wireless communications
Can someone give me an overview of how OAM states are used in communications?
Using Orbital Angular Momentum States seems like a ...
1
vote
1answer
116 views
What is the information content of a human being?
How much memory would we need to represent a human? How would each atom be stored as? Bytes? Something more complex?
1
vote
1answer
109 views
Information loss
First time poster!
I just burnt a piece of paper containing a 5 digit number I made up randomly and as far as I am concerned no one else will ever be able to retrieve the information contained on ...
6
votes
2answers
761 views
How many bytes can the observable universe store?
Is the number of states in the Universe countable?
What framework could be used to answer the question in the title?
3
votes
3answers
131 views
The role of context in information theory
Consider Hofstaedter’s jukebox analogy: A jukebox that contains only one record, but many different record players, each of which interprets that one record in a different way to produce an entirely ...
3
votes
1answer
184 views
Do laws of thermodynamics have a place in Theory of Everything? [closed]
I am having a difficulty understanding why second law of thermodynamics is still a valid universally accepted concept. I understand it works on paper for describing isolated heat systems. However, I ...
1
vote
0answers
115 views
An explanation for the Landauer's principle
Has anyone understood the Landauer's principle? What is the current status?
In specific, is there a theoretical derivation of the Landauer's Principle?(not the heuristic one based on Salizard's ...
19
votes
3answers
126 views
Does entropy measure extractable work?
Entropy has two definitions, which come from two different branches of science: thermodynamics and information theory. Yet, they both are thought to agree. Is it true?
Entropy, as seen from ...
4
votes
4answers
358 views
Uncertainty Principle for Information?
I'm not familiar (yet) on how Information theory can be emerged/used in QM/QFT but I was thinking about this question:
While we have Heisenberg uncertainty principle on measuring coupled observables, ...
10
votes
4answers
586 views
Ignorance in statistical mechanics
Consider this penny on my desc. It is a particular piece of metal,
well described by statistical mechanics, which assigns to it a state,
namely the density matrix $\rho_0=\frac{1}{Z}e^{-\beta H}$ ...
1
vote
1answer
110 views
OAM states for wireless communications
Can someone give me an overview of how OAM states are used in communications?
Using Orbital Angular Momentum States seems like a hot topic for communications. I read a few articles about the basic ...
0
votes
1answer
171 views
Is omniscience impossible?
I remember reading a brief note in Scientific American years ago about a mathematician/physicist who had published a paper that formally stated that no entity could both participate in a given system ...
5
votes
2answers
161 views
Information Loss in annihilation
The concept of information loss is usually discussed with respect to a black hole. My understanding is that whatever matter you put into the black hole, it has only 3 "hairs" and so one doesn't know, ...
0
votes
1answer
99 views
How is there a connection between energy and information?
http://physicsworld.com/cws/article/news/2010/nov/19/information-converted-to-energy
In the last part of the third paragraph of the above article it says:
"In fact, Szilárd formulated an equivalence ...
0
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0answers
138 views
Best physics toys/models for learning [closed]
I'm trying to gather as many different physical or generally thought-provoking toys as possible.
I need to know what physics toys are out there, and where to get them.
I remember coming across an ...
14
votes
2answers
2k views
Maximum theoretical data density
Our ability to store data on or in physical media continues to grow, with the maximum amount a data you can store in a given volume increasing exponentially from year to year. Storage devices continue ...
6
votes
1answer
257 views
What is the information geometry of 1D Ising model for a complex magnetic field?
Consider the one-dimensional Ising model with constant magnetic field and node-dependent interaction on a finite lattice, given by
$$H(\sigma) = -\sum_{i = 1}^N J_i\sigma_i\sigma_{i + 1} - h\sum_{i = ...
4
votes
2answers
167 views
What is the mechanism for fast scrambling of information by black holes?
Sekino and Susskind have argued that black holes scramble information faster than any quantum field theory in this paper. What is the mechanism for such scrambling?
3
votes
2answers
191 views
Entropy: two explanations for the same quantity?
I studied thermodynamics and I saw the following definition for entropy:
$$
\Delta S = \int_1^2 \frac{\text{d}Q}{T}
$$
that we use to calculate $\Delta S$ for different types of transformations.
In ...
0
votes
3answers
165 views
If a star were to suddenly dissapear, would it still have gravity?
I am wondering whether or not literally anything can travel faster than the speed of light. For example, if gravity from a star immediately ceases to have an effect if it suddenly and magically ...
4
votes
1answer
321 views
Is there really time reversibility in physics?
First, how i got to the question.
I was randomly looking at this page:
http://en.wikipedia.org/wiki/Langton%27s_ant
describing some sort of cellular automaton.
Here is the path of this automaton ...
0
votes
2answers
120 views
From what we know about QM and Elements could we simulate the Universe in a Computer?
From what we know now about Quantum Mechanics and Elements, could we simulate life the Universe at a Quantum to Element level?
If we can't assume enough to create a sim, what fundamentals are we ...
4
votes
1answer
715 views
What is the relationship between Energy, Entropy, and Information?
What is the relationship between Energy, Entropy, and Information?
I read this - What Is Energy? Where did it come from? - and the top answer says that 'energy' is an abstract number that is a ...
5
votes
3answers
255 views
Information loss in a black hole
How does the Holographic Principle help to establish the fact that all the information is not lost in a black hole?
2
votes
2answers
208 views
Number of bits needed to express physical laws?
What is the minimum number of bits that would be needed to express a given physical law, like the law of universal gravitation? How many bits are needed to express each of the four fundamental forces? ...
3
votes
1answer
222 views
Wasn't the Hawking Paradox solved by Einstein?
I just watched a BBC Horizon episode where they talked about the Hawking Paradox. They mentioned a controversy about information being lost but I couldn't get my head around this.
Black hole ...
5
votes
3answers
296 views
Confusion regarding entropy, reference papers request
1.a In paragraph at Wikipedia/Entropy it is stated:
This is because energy supplied at a high temperature (i.e. with low entropy)
tends to be more useful than the same amount of energy
...
5
votes
2answers
217 views
What reflective media do laser shows use?
I am having a hard time in finding out what exact light media laser shows use. I am trying to build a laser show myself. I know that the laser light is reflected off these particles in such a way that ...
2
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1answer
116 views
Thermodynamics and cross entropy
I am facing with the concept of cross entropy. I would like to know the thermodynamic and statistical meaning of cross entropy (if exists)?
2
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1answer
104 views
Reference paper to support information — energy relation ($kT \ln2 \rm\frac{J}{bit}$)
In answer to Maxwell's Demon Constant (Information-Energy equivalence) there is stated that one bit of information allows to perform $kT \cdot \ln2$ Joules of work. Which paper supports the ...
0
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2answers
105 views
sending information over a wire--mechanically [duplicate]
Possible Duplicate:
Is it possible for information to be transmitted faster than light?
I've thought about this since I was a little kid. I know it isn't exactly feasible, but it still ...
6
votes
3answers
917 views
Maxwell's Demon Constant (Information-Energy equivalence)
New Scientist article: Summon a 'demon' to turn information into energy
The speed of light c converts between space and time and also appears in e=mc^2.
Maxwell's Demon can turn information supplied ...
1
vote
1answer
326 views
How is information related to energy in physics?
I recently attended a talk by Dr. Ravi Gomatam on 'quantum reality', where the speaker suggested, that conservation of energy is not a fundamental law, and is conditional, but the conservation of ...
1
vote
2answers
461 views
Are information conservation and energy conservation related?
as evident from the title, are both, conservation of energy and conservation of information two sides of the same coin??
Is there something more to the hypothesis of hawking's radiation other than ...
2
votes
1answer
295 views
Physics of the Internet? [closed]
Is there a way to describe the Internet in terms of a physics theory, like how the atom is described by quantum mechanic? If there is, how is it described by this theory.
1
vote
1answer
180 views
Maxwell's Demon bug, trapdoor space and time
What about the size of the door (space) and how long has it to be opened (time)?
I think Maxwell's demon would have a problem with space, if the door is too wide (more than one particle size), then ...
6
votes
5answers
699 views
How is thermodynamic entropy defined? What is its relationship to information entropy?
I read that thermodynamic entropy is a measure of the number of microenergy states. What is the derivation for $S=k\log N$, where $k$ is Boltzmann constant, $N$ number of microenergy states.
How is ...
1
vote
2answers
334 views
Restrictions on defining microstates (Entropy)
If we have an isolated system $Sb$ with thermodynamic entropy $Eb=X$
(and growing by the 2nd law of thermodynamics),
we could define an abstract system $Sa$ (containing the system $Sb$) but define ...
8
votes
1answer
302 views
How is information defined from a thermodynamics point of view?
How is information defined from a thermodynamics point of view ? I came across some definitions using the concept of free energy of a system. If I have information stored in a finite volume of space ...
3
votes
1answer
298 views
Microsecond trading with neutrinos
The Spread Networks corporation recently laid down 825 miles of fiberoptic cable between New York and Chicago, stretching across Pennsylvania, for the sole purpose of reducing the latency of ...
