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Plus Advent Calendar Door #21: How many dimensions are there?
Could there be more than three?
Content about “ quantum uncertainty
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Plus Advent Calendar Door #20: Strings to the rescue?
A possible way of resolving the greatest problem of physics.
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Plus Advent Calendar Door #19: What's the problem with quantum gravity?
Explore the biggest problem in modern physics.
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Heisenberg's uncertainty principle
There are limits to how much you can simultaneously squeeze the quantum fuzziness of an electron's position and momentum
News story
Explaining weirdness with weirdness
A very strange way of explaining away the strangeness of quantum mechanics.
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Physics in a minute: What's the problem with quantum gravity?
At the heart of modern physics lurks a terrible puzzle: the two main theories that describe the world we live in just won't fit together.
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Schrödinger's equation — what does it mean?
In the first article of this series we introduced Schrödinger's equation and in the second we saw it in action using a simple example. But how should we interpret its solution, the wave function? What does it tell us about the physical world?
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Schrödinger's equation — what is it?
In the 1920s the Austrian physicist Erwin Schrödinger came up with what has become the central equation of quantum mechanics. It tells you all there is to know about a quantum physical system and it also predicts famous quantum weirdnesses such as superposition and quantum entanglement. In this, the first article of a three-part series, we introduce Schrödinger's equation and put it in its historical context.
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Freedom and physics
Most of us think that we have the capacity to act freely. Our sense of morality, our legal system, our whole culture is based on the idea that there is such a thing as free will. It's embarrassing then that classical physics seems to tell a different story. And what does quantum theory have to say about free will?
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String theory: From Newton to Einstein and beyond
String theory is a theory of everything in which everything's made of strings — but why strings? What do they do? Find out in our equation-free introduction for beginners.
News story
Before the Big Bang
A new mathematical model explores the time before the big bang
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Quantum geometry
One of the many strange ideas from quantum mechanics is that space isn't continuous but consists of tiny chunks. Ordinary geometry is useless when it comes to dealing with such a space, but algebra makes it possible to come up with a model of spacetime that might do the trick. And it can all be tested by a satellite. Shahn Majid met up with Plus to explain.