The Chaos Theory

meteorology - chaos theory

 

.... In the early 60's many scientists motivated by the climate changes and the increase of CO2 in the atmosphere, got involved with climate modelling. One of them was the Meteorologist Edward Lorenz, a scientist of MIT, who in 1963 used the differential equations of " Navier - Stokes " in order of modelling the evolution of the state of the atmosphere:

navier stokes

Article: "Deterministic nonperiodic flow", in the
"Journal of Atmospheric Sciences" 20 : 69 ( 1976 )

Where:
x = . Ratio of the system rotation
y = . Gradient of temperature
z =. Deviation of temperature
d =. Number of Prandtl: [ viscosity ] / [ thermal conductivity ]
r =. Temperature difference between the base and the top of the system
b =. Ratio between the length and the height of the system.

The big vortexes have got small vortexes
which are nourished through its speed
And the small vortexes have got smaller vortexes
And so to the viscosity.

Lewis F Richardson

Starting from certain initial condition (Xo, Yo, Zo) the system of differential equations can be used connected to draw the corresponding trajectory in the space of phase 3D, obtaining the following figure known as " Lorenz Attractor ":

butterfly effect
Note: the Lorenz Attractor is a geometrical figure similar to a butterfly
wich in order to be contained, it needs more than two dimensions and less than
three (2.06), therefore it is a fractal. (the inverse of the Exponent of Hurst is equal
to the fractal dimension of a series of time).

The numeric method of resolution demmands to use the data XYZ in t = n-1 to get the same data in t = n. Fortunately to Lorenz, the data numerically obtained were the same ones to the ones expected for several days, until one morning he decided that he had to save paper and time (we are talking about a "Royal McBee" computer of the 60's), so he used three decimals in the input data instead of using six ... and that was the time when the chaos appeared: The trajectory in the Space of Phase started to follow a different route, very different from the original tendency, which was really new. A small margin of error in the input data take us to diagnose show in summer, and as matter of fact, it could happen in the rel word. Up to that time, the Physicist were used to see that a slight difference in the input data had to cause a slight difference in the output data. For example, to obtain the maximum reach of a projectile it is necessary that the angle can be equals to 45.000... º but nobody cares about the next ten decimals and it does not seem logical to ask for such accuracy. However there are sensitive systems to the initial conditions, like the atmospheric weather, where two points infinitesimally close in Space of Phase can follow totally contradictory trajectories. The technologic margin of precision is always going to be larger than the maths concept of "differential", it can be concluded that it's impossible to make a reliable meteorological prediction in a long term. In spite of this the trajectories have the tendency to be concentrated in certain zones ("attractors"), as a matter of fact it is possible to forecast the global behaviour of the system (example: hot in summer and cold in winter, the two lobes of the Lorenz Attractor). We can also observe that an infinitesimal difference in the initial conditions can be illustrated with a system A of control v/s the same system A with a butterfly fluttering its wings. As we know now that the trajectories in the space of phase can be totally different, we can state that "A butterfly fluttering its wings in Hong Kong can even provoke a tornado in Kansas" (Butterfly Effect).

The Holographic Universe and the Golden Connection
According to the old mechanist paradigm (XVII C) the whole is simply the suming up or joining of the parts, in a similar way to a clock mechanism. As Isaac Newton's quoted: "The Universe is simply a gigantic machine". On the other side, the relatively new paradigm of the Theory of Systems (XX C) recognizes the sinergy among the parts. Then, the whole is greater than the addition of its parts: when the parts join together, new connections among them appear, what generates the appearing of new properties:
i) The human being is not equals to the simple joining up of his organs. The physical confort depends on a harmonic equilibrium among all the organs of the human body and not of what happens to every single organ. When we take an aspirin, this gets dissolved in the blood, affecting by this way the whole body.
ii) If a toxic gas (chlorine) joins a metal (sodium) they generate a substance that gives a "good taste" to the meat: the salt. The properties of the salt have not got any relation with the ones of the toxic gas neither with the ones in a metal.

..... Latest research (ex. the study of hadrons in Physics of Particles) take the systemic hypothesis to more complex levels: the one of the part containing the whole ("Holons"). For example, in the case of the regular fractals, we have that they get their properties (and even their visual effect) in front of the changes in scale.

Sierpinski triangle
regular fractal

..... The hypothesis of "The Holographic Universe" tells us that the information of the whole universe is contained in any sub-set of it. So it should be possible to rebuild the whole universe from a simple microbe. In other words: the parts are reproductions on scale of the whole. Or also: the whole is contained in every single part, the same as a hologram. If we chop in many parts the plaque of a hologram, it happens that every section will have the faculty to reproduce by itsellf the original image. One similar idea is outlined in the Sutra Avatamsaka (~ V Century BC):

In the sky of Indra there is a web of pearls ordered in such a way that if you look through one, you will see all the other reflected in it. In the same way, every object of the world is not just itself, but it includes any other single object and it is, in fact, every other [ ... and inside Indra's Tower... ] there are also hundreds of thousands towers [or Universes], every one so exquisitely ornamented like the Main Tower and so spacious like Heaven. And all these towers beyond a number could be calculated, don't absolutely disturb each other; every one preserves its individual existence in perfect harmony with all the rest; there is nothing here that could impede one tower being fusioned with all the rest individually and collectively; there's a state of perfect mixture and, however, of perfect order. Sudhana, the young pilgrim, sees himself in all the towers and in every one of them, where the whole is contained in every one and every one is contained in the whole.

.... The hypothesis that tells that the part contains the whole can be expressed mathematically:

holons

We want that the part be a reproduction to scale of everything, it means:

phi

The equation to solve is: x2 - x - 1 = 0
As x >0:

This number is named "Phi" in honour to the greek architect Phidias and during the Renaissance it was known as the "Golden Number" or "Divine", because the grees deduce it from demands that joined philosophy, religion and mathematics.

According to the Greeks, the perfect rectangle is the golden: phi

The Holographic Principle
i) Black Holes
- According to Shannon, the information can be measured through the "informatic entropy", a magnitude directly proportional to the amount of bits and to the "thermodynamics entropy".
- The thermodynamics entropy in a black hole is equals to:

black hole and information
(Jacob Bekenstein)

- Let's see that the entropy in a black hole is proportional to its surface. Also, the black holes are the objects with the greatest possible entropy. Inference: the information stored by a black hole is proportional to its surface.
- It's important here to mention that four areas of Planck are needed (~ 2.61*10-66 cm2) to describe a bit over the surface of events of a black hole.

ii)Holographic Paradox
The information contained in a microchips is directly proportional to the amount of microchips. This lead us to show that in normal conditions the information is directly proportional to the volume. Inference: the information is an extensive amount (like the weight). However, if we increase the density of the matter, that amount of microchips could become a black hole, achieving the paradox that the information could be coded in the surface of events (and not in the volume of the microchips). That's why in this extreme case, the information stops being an extensive amount: All the 3D information could be coded as 2D. Ergo...

holographic principle
What can assure that our perception of being
living in a 3D space is nothing else that an illusion?

Holographic Principle
A complete description of what happens inside a 3D room can be obtained, with just describing what happens to the 2d walls.






* Fibonacci's Series
Leonardo de Pisa, aka Fibonacci (XIII Century), traveled around Asia Minor and got contacts with the greates mathematics of the time. Thanks to them he realizad that many natural phenomena could be modelled up with the following series:

Fibonacci

The series outputs the following calues: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, etc.

Examples

i) Pine nut

Fibonacci

ii) Nautilus's Shell

Fibonacci

iii) Spiral Galaxy

Fibonacci

iv) Biological Example
A microbe lasts one hour to maturate and one hour to reproduce itself through mitosis. Then, amount of microbesin function of time will be:

t
n
0
0 (the experiment starts)
1
1(A microbe "A" is set)
2
1 (Microbe A mature)
3
2 (Microbe A + its descendency)
4
3
5
5
6
8, etc

Let's diagram now Q = x(t) / x(t-1) with t >= 2:

Fibonacci
What's the number that the series has tendency to?

Fortuity?
If the Universe wants to tell us something, what would be the language it would use?
Galileo's answer: "The Universe is written in Maths language".
According to the Astronomer James Jeans: "More than a great machine, the Universe seems to be a great thought".


CHARACTERIZATION OF THE CHAOS
... The Theory of Chaos allows us to deduce the subjacent order that the apparently random phenomena hide. It is well known that the totally determinist equations (like the Lorenz's set) show the following characteristics that define the chaos:
i) They are redetrminist, it means:
- There is a "law" that rules the behaviour of the system (what's the opposite to "determinist"? "Random"? or "with free will"? Is there free will to the hard sciences or is it just an illusion?)
- The phenomenon could be expressed by the "understanding" instead of doing it through "extension".
- There is a simulation of lower amount (Kb) than the original system that allows to generate the same data observed.
... It is important to quote that according to Chaitin (1994) a system is random when the algorythm that its own series generates uses more Kb than the original system (likewise, the more efficient is to express the system by "extension" and not through an algorythm)
ii) They are very sensitive to the initial conditions.
An infinitesimal deviation in the starting point causes an exponential divergency in the trajectory of the Space of Phase, what can be quantified with the "Lyapunov Exponent".
- The extreme sensibility to the initial conditions makes that the system behaviour could be indetermined from the "Predictibility Horizon", as the technological uncertainty is associated to the input data it's always going to be greater to the concept of "mathematics infinitesimal".
- In spite of the unpredectibilty of a particular trajectory of the Space of Phase, "Attractors" can be found or zones of the Space of Phase that tend to be "visited" with more frequency than others.
NOTE: Normally the trajectory of the Space of Phase of a chaotic system generates a fractal curve (of fractionary dimension)
iii) They seem aleatory or disordered, but finally they aren't:
- They follow determinist equations
- They show attractors
.... An example of determinist but chaotic equations is:
fractals
... The butterfly effect can be illustred comaring the diagrams that are got when the following initial conditions are used:
System A: Xo = 0.399999
System A + a butterfly: Xo = 0.400000 (just a millionth of difference)

butterfly effect

... Some Mathematic tools that allow us to study the chaos are:
i) Hurst's Exponent (H)
A number that indicates the influence degree from the present over the future (degree of similitude of the phenomenon with the "Brownian Movement" or "Aleatory Walker".
Possibilities:
- H > 0.5: Persistent system (positive correlation). Example: If H = 0.7, then there is a 70% possibility that the following member in the series shows the same trend that the actual member.
- H = 0.5: Aleatory system (null correlation or "blank noise")
- H < 0.5: Antiperistent system (negative correlation)
ii) Relative Complexity of Lempel Ziv (LZ)
It is a valuation of the algorythmic complexity degree that it should present a simulation capable to represent faithfully and accurately the phenomenon. It is calculated through the Kaspar and Schuster algorythm.
Possibilities:
LZ = 1.0 = Maximum complexity (aleatory series)
LZ = 0.0 = Perfectly predictable series.

"[That the trajectories of the Space of Phase have] sensitive dependency of the initial conditions means that they have tendency to separate themselves
from the closer trajectories."

James Gleick

iii) Greater Exponent of Lyapunov (L)
It is a valuation of the maximun divergency ratio between two trajectories of the Space of Phase of which initial conditions difere infinitesimally. The units are bits per unit of time (in 2 base) and they are calculated with the algorythm of wolf.
Possibilities:
- L < = 0: periodic series
- L > 0: chaotic series
- L ---> oO : aleatory series
iv) Informatic Entropy
It is an indication of the degree of disorder of the data an it is calculated adding up the positive exponents of Lyapunov in e base (algorythm of Grassberger and Procaccia).

End of the series

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