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Archive for กรกฎาคม 2007

Good Theoretical Physicists . . .

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Written by suppiya

กรกฎาคม 11, 2007 at 2:00 am

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On Symmetries . . .

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M. C. Escher’s Angel and Demon


“…although the symmetries are hidden from us, we can sense that they are latent in nature, governing everything about us. That’s the most exciting idea I know: that nature is much simpler than it looks. Nothing makes me more hopeful that our generation of human beings may actually hold the key to the universe in our hands — that perhaps in our lifetime we may be able to tell why all of what we see in immense universe of galaxies and particles is logically inevitable.”

Steven Weinberg


References:


Written by suppiya

กรกฎาคม 9, 2007 at 10:07 am

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On Science . . .

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Big Science vs. Little Science


“The scientist does not study nature because it is useful;
he studies it because he delights in it,
and he delights in it because it is beautiful.
If nature were not beautiful, it would not be worth knowing,
and if nature were not worth knowing,
life would not be worth living.”

Jules Henri Poincaré


Written by suppiya

กรกฎาคม 9, 2007 at 9:34 am

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On God . . .

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Does God Play Dice?


bj เคยกล่าวไว้ว่า


“คนที่เชื่อในแนวคิดของพระเจ้าแบบมีเหตุผลเช่น พระเจ้าแบบสปิโนซ่า คือพวกมักง่ายทางความคิด หาคำอธิบายที่ดีกว่าไม่ได้ก็ใช้พระผู้สร้างเป็นคำตอบ ส่วนพวกที่เชื่อในพระเจ้าว่าเป็นทุกสิ่ง กำหนดทุกอย่างโดยไม่ได้เชื่อในกระบวนการใช้เหตุผลทางวิทยาศาสตร์เลยนั้นเป็นคนงมงายและเขลา”


Richard P. Feynman once said,


God was invented to explain mystery. God is always invented to explain those things that you do not understand. Now, when you finally discover how something works, you get some laws which you’re taking away from God; you don’t need him anymore. But you need him for the other mysteries. So therefore you leave him to create the universe because we haven’t figured that out yet; you need him for understanding those things which you don’t believe the laws will explain, such as consciousness, or why you only live to a certain length of time — life and death — stuff like that. God is always associated with those things that you do not understand. Therefore I don’t think that the laws can be considered to be like God because they have been figured out.”

Quoted by P.C.W. Davies and J.R. Brown in
Superstrings: A Theory of Everything,
p.208 (1988).


Paul A. M. Dirac once said,

God used beautiful mathematics in creating the world.

Paul Dirac did not believe in God. But here he used `God’ as a metaphor for nature. 🙂

I cannot understand why we idle discussing religion. If we are honest — and as scientists honesty is our precise duty — we cannot help but admit that any religion is a pack of false statements, deprived of any real foundation. The very idea of God is a product of human imagination. […] I do not recognize any religious myth, at least because they contradict one another. […]

Wolfgang Pauli jokingly said:

“Well, I’d say that also our friend Dirac has got a religion and the first commandment of this religion is: God does not exist and Paul Dirac is his prophet.” 😀


God does not play dice [with the universe].

Albert Einstein


Not only does God play dice, but
he sometimes throws them where they cannot be seen.

Stephen Hawking


Nature and nature’s laws lay hid in night;
God said, `Let Newton be!’ and all was light.

Alexander Pope


It did not last: the devil, howling `Ho.
Let Einstein be!’ restored the status quo.

Sir John Collings Squire


God rolled his dice, to Einstein’s great dismay:
Let Feynman be!’ and all was clear as day.

Jagdish Mehra


In the face of darkness, God said

\textrm{` } {-}\square{}A^{\nu}=\mu_{0}J^{\nu}\textrm{ '}

and there was Light.

เปี้ยว วิชาการ.คอม


It did not last; the devil howling

\textrm{` } {-}\square{}A^{\nu}=\mu_{0}\left[g^{\nu\alpha}+\dfrac{\partial^{\nu}\partial^{\alpha}}{\nabla^{2}}-g^{\nu{}i}\dfrac{\partial_{i}\partial^{\alpha}}{\nabla^{2}}-g^{\alpha{}i}\dfrac{\partial_{i}\partial^{\nu}}{\nabla^{2}}\right]J_{\alpha}\textrm{ '}

restored the status quo.

อู๋หมิง วิชาการ.คอม



…a universe with no edge in space, no beginning
or end in time, and nothing for a Creator to do.

Carl Sagan (foreword to A Brief History of Time)

Power + Religion = Holy Shit


References:


Written by suppiya

กรกฎาคม 2, 2007 at 10:16 am

เขียนใน Misc.

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On Theoretical Physics . . .

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Does God Play Poker?


“…the axiomatic basis of theoretical physics cannot be extracted from experience but must be freely invented.”

Albert Einstein


“Physics constitutes a logical system of thought which is in a state of evolution, whose basis (principles) cannot be distilled, as it were, from experience by an inductive method, but can only be arrived at by free invention. The justification (truth content) of the system rests in the verification of the derived propositions (a priori/logical truths) by sense experiences (a posteriori/empirical truths).  …Evolution is proceeding in the direction of increasing simplicity of the logical basis (principles).  …We must always be ready to change these notions — that is to say, the axiomatic basis of physics — in order to do justice to perceived facts in the most perfect way logically.”

(Albert Einstein, Physics and Reality, 1936)


“The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.”

(Albert Einstein, 1918)


“It is the grand object of all theory to make these irreducible elements (axioms/assumptions) as simple and as few in number as possible, without having to renounce the adequate representation of any empirical content whatever.”

(Albert Einstein, 1954)


“The development during the present century is characterized by two theoretical systems essentially independent of each other: the theory of relativity and the quantum theory. The two systems do not directly contradict each other; but they seem little adapted to fusion into one unified theory. For the time being we have to admit that we do not possess any general theoretical basis for physics which can be regarded as its logical foundation.”

(Albert Einstein, 1940)


“If, then, it is true that the axiomatic basis of theoretical physics cannot be extracted from experience but must be freely invented, can we ever hope to find the right way? I answer without hesitation that there is, in my opinion, a right way, and that we are capable of finding it. I hold it true that pure thought can grasp reality, as the ancients dreamed.”

(Albert Einstein, 1954)


“Physical laws should have mathematical beauty.”

Paul A. M. Dirac


“It is wrong to think that the task of physics is to find out how nature is.
Physics concerns what we can say about nature.”

Niels Bohr


“The main goal of physics is to describe a maximum of phenomena
with minimum of variables.”

CERN Courier


Open-Site Owl

Written by suppiya

กรกฎาคม 2, 2007 at 9:04 am

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Physics Jokes . . .

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Heisenberg Uncertainty Principle


Heisenberg is out for a drive when he’s stopped by a traffic cop. The cop says “Do you know how fast you were going?” Heisenberg says “No, but I know where I am.”


References:


Written by suppiya

กรกฎาคม 1, 2007 at 12:20 pm

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ใส่ไว้กันลืม . . .

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Hawking's NutShell


  1. Motion Mountain — The Adventure of Physics by Christoph Schiller
    [http://www.motionmountain.net/]
  2. Light and Matter: educational materials for physics and astronomy by Benjamin Crowell
    [http://www.lightandmatter.com/]

Written by suppiya

กรกฎาคม 1, 2007 at 1:00 am

เขียนใน Misc.