Theory
in sentence
2204 examples of Theory in a sentence
In our era, a new approach to unify the laws of physics is being pursued by physicists such as myself, many others around the world, it's called superstring theory, as you were indicating.
And the wonderful thing is that superstring
theory
has nothing to do at first sight with this idea of extra dimensions, but when we study superstring theory, we find that it resurrects the idea in a sparkling, new form.
Well, it's a
theory
that tries to answer the question: what are the basic, fundamental, indivisible, uncuttable constituents making up everything in the world around us?
Here is the new idea of string
theory.
And that's what we mean by a unified
theory.
When you study the mathematics of string theory, you find that it doesn't work in a universe that just has three dimensions of space.
Now, does string
theory
offer an answer?
And string
theory
suggests that those 20 numbers have to do with the extra dimensions.
So when we talk about the extra dimensions in string theory, it's not one extra dimension, as in the older ideas of Kaluza and Klein.
This is what string
theory
says about the extra dimensions.
Now in string theory, all the numbers are reflections of the way strings can vibrate.
And now string
theory
comes along and says, yes, gravity, quantum mechanics, electromagnetism, all together in one package, but only if the universe has more dimensions than the ones that we see.
And this
theory
is quite spectacular, but it has an obvious problem which is that it's built on just a few and very specific examples.
So the question is whether the
theory
that introspection built up in human history only about 3,000 years ago can be examined in a quantitative and objective manner.
That's because of the applications: communication theory, information theory, game theory, compressed sensing, machine learning, graph analysis, harmonic analysis.
Humanity actually solved agricultural poverty a century ago, in
theory.
OK, so that sounds really nice in theory, but what about in practice?
Well, today, I want to challenge that
theory.
Now there's a
theory
called super-symmetry, which doubles the number of particles in the standard model, which, at first sight, doesn't sound like a simplification.
So a very compelling
theory
that's really mainstream physics.
And you see this incredible variety of different sorts of cells, even the cellular
theory
itself was quite new at this point.
All of a sudden, this isn't
theory
anymore.
Darwin would observe hundreds of chickens while finalizing his historic work introducing the
theory
of Evolution.
And the most popular
theory
for why that might be the case is that cultures begin to recognize a color only once they have the ability to make that color.
And she had a
theory
that small, uncivil actions can lead to much bigger problems like aggression and violence.
And when you have that, then evolutionary
theory
tells us that natural selection will favor the more exploitative, more predator-like organisms.
And so, the
theory
tells us that when diarrheal disease organisms are transported by water, we expect them to be more predator-like, more harmful.
And the very simple version is this: We care about "does the data support the theory?"
Does the data increase our belief that the
theory
is true?
But instead, we end up asking, "Is the data consistent with the theory?"
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