Tag Archives: Physics

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 , , , , , , | 81 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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Sean Carroll on the Many Worlds Interpretation of quantum mechanics

Related to the post last week on quantum mechanics, here is a talk that got mentioned in the discussion thread.  Warning: Carroll is a passionate advocate for the Many Worlds Interpretation, so don’t expect a fair and balanced discussion.  The … Continue reading

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Do all quantum trails inevitably lead to Everett?

I’ve been thinking lately about quantum physics, a topic that seems to attract all sorts of crazy speculation and intense controversy, which seems inevitable.  Quantum mechanics challenges our deepest held most cherished beliefs about how reality works.  If you study … Continue reading

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Consciousness is composed of non-consciousness

The components of a thing are not individually the thing. For example, the components of the chair I type most of my blog posts from are not the chair itself, but the wood of the frame, the springs for the … Continue reading

Posted in Mind and AI, Philosophy, Science | Tagged , , , , , , | 63 Comments

In case you haven’t heard yet, gravitational waves have been detected

I won’t attempt to describe the implications.  For that, your best bet is to read it from one of the experts, Ethan Siegel: The First Detection Of Gravitational Waves Validates Einstein In A Whole New Way! Let’s hope those implications aren’t … Continue reading

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SMBC: What if the universe is made of math?

I loved this SMBC.  It echoes something I’ve observed before, that some physicists have disdain for philosophy, while often engaging in it themselves. Hovertext: “Philosophy is dumb, unless it comes out of the mouth of a physicist.” Click through for full … Continue reading

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