# Archivo de la categoría: Ciencia

Mis pensamientos sobre ciencias no de física — como la biología evolutiva, la neurociencia cognitiva, etc.

# Interpretation of Special Relativity

When we looked at Quantum Mechanics, we talked about its various interpretations. The reason we have such interpretations, I said, is that QM deals with a reality that we have no access to, through our sensory and perceptual apparatuses. Por otra parte, Special Relativity is about macro objects in motion, and we have no problem imagining such things. So why would we need to have an interpretation? The answer is a subtle one.
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# Speed of Light

The speed of light being a constant sounds like a simple statement. But there is more to it, quite a bit more. Let’s look at what this constancy really means. A primera vista, it says that if you are standing somewhere, and there is a ray of light going from your right to left, it has a speed c. And another ray of light going from left to right also has a speed c. So far, so good. Now let’s say you are in a rocket ship, como se muestra en la siguiente figura, moving from right to left.

# Teoría especial de la relatividad

Cuando oímos hablar de Einstein y la relatividad especial (o la teoría especial de la relatividad, utilizar el nombre real), pensamos en la famosa $E = mc^2$ ecuación, y las cosas extrañas como la paradoja de los gemelos. Mientras que esas cosas son ciertas e importantes, el problema SR trata de resolver es un ser completamente diferente. Es un intento de defender un principio básico de la física.
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# Quantum Mechanics – Interpretations

Whenever we talk about Quantum Mechanics, one of the first questions would be, “What about the cat?” This question, realmente, is about the interpretations of Quantum Mechanics. The standard interpretation, the so-called Copenhagen interpretation, leads to the famous Schrodinger’s cat.
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# Quantum Field Theory

In this post on Quantum Mechanics (QM), we will go a bit beyond it and touch upon Quantum Field Theory – the way it is used in particle physics. In the last couple of posts, I outlined a philosophical introduction to QM, as well as its historical origin – how it came about as an ad-hoc explanation of the blackbody radiation, and a brilliant description of the photoelectric effect.
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# Historical Origin of Quantum Mechanics

En esta sección, we will try to look at the historical origin of Quantum Mechanics, which is usually presented succinctly using scary looking mathematical formulas. The role of mathematics in physics, as Richard Feynman explains (in his lectures on QED given in Auckland, New Zealand in 1979, available on YouTube, but as poor quality recordings) is purely utilitarian.
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# Mecánica Cuántica

Mecánica Cuántica (QM) is the physics of small things. How do they behave and how do they interact with each other? Conspicuously absent from this framework of QM is why. Why small things do what they do is a question QM leaves alone. Y, if you are to make any headway into this subject, your best bet is to curb your urge to ask why. Nature is what she is. Our job is to understand the rules by which she plays the game of reality, and do our best to make use of those rules to our advantage in experiments and technologies. Ours is not to reason why. Realmente.

# Classical Physics

The main difficulty in describing particle physics to general public is the fact that it is built on modern physics. Even if you are physics aficionado and did extremely well in your high school physics, what you have learned and loved is classical physics. The difference between classical physics and modern physics is not just more physics, but a completely new way of looking at the reality around us.
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# reduccionismo

En todos nuestros esfuerzos científicos, utilizamos técnicas de alto nivel similares a comprender y estudiar las cosas. La técnica más común es reduccionismo. Se basa en la creencia de que el comportamiento, propiedades y la estructura de los objetos grandes y complejos pueden ser entendidos en términos de sus componentes más simples. En otras palabras, tratamos de comprender la totalidad (el universo, por ejemplo) en términos de menor, constituyentes reducidos (tales como partículas).

# Partículas e Interacciones

Recientemente, Di una charla sobre las partículas e interacciones a los compañeros de clase de mi hija que estaban planeando en un viaje a DESY, Alemania y quería tener una idea de lo que todo estaba a punto. Como mi primera charla de este tipo, Yo estaba un poco nervioso porque no sabía qué nivel, y el fondo, Debería fijar el discurso en. Yo no quiero que sea demasiado básico, por lo que pensé que sería una pérdida de tiempo. Tampoco quiero que sea demasiado técnico, que también haría inútil de una manera diferente.