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Quantum Mechanics II: Decoherence & States

Strictly speaking, most of the other rules about QM are already implicit in what I've already said.  But a few implications of this setup are worth pointing out. First note that, in QM, the "state"...

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Quantum Mechanics III: Wavefunctions

Previously I talked about interference, the chief weird thing about QM that makes it different from Classical Mechanics.  You have to think about complex-valued "amplitudes", from which you derive...

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Open and Closed

A reader asks: This seems to be as good a place as any to ask a question about closed universes. See, in a lot of popular science books, they teach you that an "open" universe is one where space is...

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On the importance of units

In my recent talk about fine tuning, I mentioned that the numerical value of a physical quantities with units (such as meters, joules, etc.) is just an arbitrary human convention.  So if you don't...

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Interpreting the Quantum World I: Measurement & Non-Locality

In previous posts Aron introduced us to the strange, yet compelling world of quantum mechanics and its radical departures from our everyday experience. We saw that the classical world we grew up with,...

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Interpreting the Quantum World II: What Does It Mean?

In the first installment of this series, we immersed ourselves in the quantum realm that lies beneath our everyday experience and discovered a universe that bears little resemblance to it. Instead of...

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Prizes

I've recently won a pretty big prize in theoretical physics, called the New Horizons Prize.  This is a smaller version of the Breakthrough Prize which is awarded to more junior researchers. My prize is...

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Breakthrough Panel Discussion on Time Travel

Everyone seemed to love the panel discussion on "Is time travel possible?", featuring Veritasium's Derek Muller as host; and Nima Arkani-Hamed, Daniel Harlow, Daniel Jafferis, and myself as panelists....

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Curvature I: Space

My own suspicion is that the Universe is not only queerer than we suppose, but queerer than we can suppose. – J.B.S. Haldane (Possible Worlds and Other Papers, 1927) I was born hopelessly curious and...

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Curvature II: Spacetime

By Scott Church – Guest Blogger In the first installment of this series, we explored the nature of curved spaces and introduced ourselves to some of the mathematical tools needed to describe how...

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