Growing doubt that gravitational waves were actually detected

Nature has an article up describing the problems with the BICEP2 results that are now being identified by various scientists.  It's actually the second one I've seen them publish on this. The astronomers who this spring announced that they had evidence of primordial gravitational waves jumped the gun because they did not take into proper … Continue reading Growing doubt that gravitational waves were actually detected

Max Tegmark posts his chapter on cosmic inflation online

If you enjoyed my write up on Tegmark's Level II multiverse, you might enjoy this guest post that he makes on Sean Carroll's blog, which includes a link to the chapter on inflation from his book, including those visual aids I referenced! Since the BICEP2 breakthrough is generating such huge interest in inflation, I’ve decided … Continue reading Max Tegmark posts his chapter on cosmic inflation online

Does anyone have a link to a detailed description of the cosmological horizon problem?

So, I'm trying to understand cosmic inflation a bit better, and I've concluded that I don't understand one of the chief itches that it scratches.  I know the standard explanation about regions of space being too far apart to have ever interacted, but I don't get why they couldn't have interacted when the universe was … Continue reading Does anyone have a link to a detailed description of the cosmological horizon problem?

PHD Comics: Cosmic Inflation Explained

So, even though I already linked to two sources about cosmic inflation this week, this is good enough that I'm also going to throw it in.  It's fascinating to me that the large scale structure of our universe is ultimately caused by quantum fluctuations in the earliest moments of the big bang. Click through for … Continue reading PHD Comics: Cosmic Inflation Explained

Are Parallel Universes Unscientific Nonsense?

If you’re a multiverse skeptic, you should know that there are many potential weaknesses in the case for parallel universes, and I hope you’ll find my cataloging of these weaknesses below useful. To identify these weaknesses in the pro-multiverse arguments, we first need to review what the arguments are. via Are Parallel Universes Unscientific Nonsense? … Continue reading Are Parallel Universes Unscientific Nonsense?