Einstein’s unfinished revolution

Lee Smolin gave a lecture at the Perimeter Institute this week. Here’s the blurb: “On April 17, in a special webcast talk based on his latest book, Einstein’s Unfinished Revolution, Perimeter’s Lee Smolin will argue that the problems that have bedeviled quantum physics since its inception are unsolved and unsolvable for the simple reason that the theory is incomplete. There is more to quantum physics waiting to be discovered”. This sounds interesting. It's definitely my kind of thing. Let’s take a look. 00:49 Greg Dick starts…

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Mysteries of physics summary

Here’s my summary of my feedback to the 18 biggest unsolved mysteries in physics by Natalie Wolchover and Jesse Emspak: Mysteries of physics part1 What is dark energy? Think of the universe expanding because space has an innate pressure, like a squeezed-down stress ball. Then think of a bubble-gum balloon in vacuum. As it expands the skin gets thinner and weaker, and less able to resist the further expansion. So it expands further, so the skin gets even thinner and weaker, and so on. So the…

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Mysteries of physics part4

This is the fourth and final section of mysteries of physics. I’m working through the 18 biggest unsolved mysteries in physics by Natalie Wolchover and Jesse Emspak. In doing so I’m forming an opinion that some mysteries are nothing of the kind. I’m also forming an opinion that some physicists and institutions peddle mystery in order to promote themselves, because they aren’t doing useful science. More on that another day. Meanwhile, on with the show: When sound waves make light Though particle-physics questions account for many…

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Mysteries of physics part3

Again carrying on from last week, I’m working through the 18 biggest unsolved mysteries in physics by Natalie Wolchover and Jesse Emspak. I’ve done the first nine. The next topic concerns grand unified theories, the sort of thing Alan Guth was thinking of when he came up with inflation. A grand unified theory or GUT is said to be a step toward a theory of everything or TOE. Do the universe's forces merge into one? The universe experiences four fundamental forces: electromagnetism, the strong nuclear force, the…

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Mysteries of physics part2

Carrying on from last week, I’m working through the 18 biggest unsolved mysteries in physics by Natalie Wolchover and Jesse Emspak. Of course, not everybody would come up with the same list, so if there’s anything you’d like me to talk about, please drop me a line using the contact form. OK, where were we? We’ve had dark energy, dark matter, the arrow of time, parallel universes, and the mystery of the missing antimatter. Next is the fate of the universe: What is the fate of…

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Mysteries of physics part1

When I google on mysteries of physics, a whole pile of websites comes up. Top of the list is the 18 biggest unsolved mysteries in physics. It’s a Livescience article written by Natalie Wolchover and Jesse Emspak. It makes for interesting reading, especially for me. That’s because I’m the physics detective. I solve mysteries. Some people don’t. Instead some people peddle mystery. Because mystery sells, just like quantum sells. That’s why CERN peddle the myth that antimatter might fall up, even though everybody who knows about…

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The double slit experiment

There’s a nice little physicsworld article dating back to 2002. It was written by then-editor Peter Rodgers, and it started by asking “What is the most beautiful experiment in physics?” The answer was, of course, the double slit experiment: Double slit experiment image from the curiosity makes you smarter article by Ashley Hamer People refer to the double slit experiment as an example of the weirdness of quantum physics. Or to promote weird ideas such as the multiverse. See for example Tim Radford’s 2010 Guardian article…

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Quantum computing and the quantum quacks

I have a computer science degree. I work in IT, and have done so for many years. In that period "classical" computers have advanced by leaps and bounds. I remember teletypes and paper tape, and punched cards too. I also remember when a top-notch disk drive was the size of a washing machine and the cost of a car. It provided a miserly 10 megabytes of storage. My disk drive today is the size of my wallet and cost £46.99. It provides a terabyte of storage.…

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Quantum gravity is a castle in the air

When you spend some time digging into the history of physics, you find yourself uncovering the foundations of physics, and then you come to appreciate a few things. You come to appreciate how gravity works, and why an electron falls down. It isn’t because gravitons are flying back and forth: Graviton image by Julie Peasley, see http://www.particlezoo.net/ You also come to appreciate that light interacts with light to form electrons and positrons in gamma-gamma pair production. You come to appreciate that the electron is not a…

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What energy is

If you ask what is energy? some people will tell you that energy is an abstract thing. This was how Richard Feynman described it in the Feynman lectures, volume I chapter 4. He used the analogy of children’s blocks. He said these blocks were absolutely indestructible and could not be divided. But then he said there are no blocks. Only then he contradicted himself by saying energy has a number of different forms, such as gravitational energy, kinetic energy, and heat energy: Image from Assignment point…

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