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The title is The Force of Fundamental Interactions

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and as Pepe has just said, maybe it should have been The "Forces" of

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Fundamental Interactions. The reason why I chose "The Force" is because I want to believe

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that maybe what we now call fundamental interactions, and there are

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several of them, can actually converge towards one same force.

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This is just expeculation so far but I am going to try and explain

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the condition knowledge is in regarding this expeculation.

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The second thing that I want to clarify is what we consider as "fundamental".

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This is a word of considerable importance, so we should know its meaning.

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We use the word "fundamental" in this field to talk and refer to

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basic laws of the workings of the universe;

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we are talking about the deep nature of what governs the

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interaction among matter. "Fundamental" in the sense that we are going to see

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the fundamental elements of matter, that is to say, those elemental particles

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that govern matter. "Elemental" in the sense that they do not have internal components,

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which are the most essential elements, base to be used and from which

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the rest is constituted. The interacting forces are also "Fundamental",

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they make these particles interact,

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they are the basic forces of Nature.

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The Fundamental interactions that I am going to explain are the ones that have been

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experimentally studied: gravity, electromagnetism...which are

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interactions covering long distances, and that's why they are the ones we

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find in our daily lives; and also interactions that cover quite short distances,

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for instance in the inside of the nucleous, distances that are smaller than

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the common nuclear distance:  weak and strong nuclear interactions.

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I am going to tell you about the history of the evolution

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of knowledge concerning these three interactions, so first

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I want to show you the actors that will play a role in this meeting, which

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practically covers the history of the 20th century,

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from its beginning until nowadays. This lecture intends to clarify some elements

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in order to help you understand what Franco Elche is drawing in this blackboard.

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Excerpt from the conference held

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November 12th, 2015, at the Residencia de Estudiantes,

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during the sessions "Los límites de la Física Fundamental".

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Full video available at: www.eddaddeplata.org