Tag Archives: Physics

Is entanglement decoherence from the outside, and decoherence entanglement from the inside?

A recent tweet by Sean Carroll has me thinking. Measurement is only if the interaction generates entanglement. Many times they do not! — Sean Carroll (@seanmcarroll) December 9, 2019 Quantum decoherence is said to occur when a particular quantum system … Continue reading

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The problems with post-empirical science

Jim Baggott has a pretty good piece at Aeon on the problems with post-empirical science.  I’ve highlighted Baggott’s views before.  Along with others like Sabine Hossenfelder and Peter Woit, he calls attention to a serious issue in physics, the rising … Continue reading

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Sean Carroll’s Something Deeply Hidden

I’m just about finished reading Sean Carroll’s Something Deeply Hidden.  I was going to wait to post this until I’d completely finished, but all I’ve got left is the appendix, I perceive that I’ve gotten through the main points, and … Continue reading

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Why you can’t use quantum entanglement for faster than light communication

Albert Einstein, with his theory of special relativity, established that the speed of light is the absolute speed limit of the universe.  A rocket ship attempting to accelerate to the speed of light encounters some well known effects: time dilation, … Continue reading

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Recommendation: What Is Real?

Last week I started listening to a Sean Carroll podcast episode, an interview of Adam Becker on his book, What Is Real?: The Unfinished Quest for the Meaning of Quantum Physics.  Before even finishing the episode, I downloaded Becker’s book … Continue reading

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Is cosmology in crisis?

In past posts, when I’ve written about the expansion of the universe, I’ve generally referred to the rate of that expansion, the Hubble constant, as being around 70 km/s/megaparsec, that is, for every megaparsec a galaxy is distant from us, … Continue reading

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Is cosmic inflation settled science?

Ethan Siegel at Starts With a Bang has a post up arguing that the multiverse must exist.  His reasoning has to do with cosmic inflation.  Inflation is the theory that the universe expanded at an exponential rate in the first … Continue reading

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What’s at the edge of the universe?

Gizmodo has an interesting article that someone asked my thoughts on.  Part of their “Giz asks” series, it asks various physicists what’s at the edge of the universe?  The physicists polled include Sean Carroll, Jo Dunkley, Jessie Shelton, Michael Troxel, … Continue reading

Posted in Space | Tagged , , , , , | 29 Comments

Why faster than light travel is inevitably also time travel

I’ve always loved space opera, but when I was growing up, as I learned more about science, I discovered that a lot of the tropes in space opera are problematic.  Space operas, to tell adventure stories among the stars, often … Continue reading

Posted in Science Fiction, Space | Tagged , , , , , , | 172 Comments

Dark energy and repulsive gravity

Over the weekend, Sean Carroll put up a blog post to address common misconceptions about cosmology.  I understood most of his points, but was confused when I saw this one: Dark energy is not a new force; it’s a new substance. … Continue reading

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