Science
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Front Page Probability
In a bid to combine numeracy with sports coverage, The Observer presents the Poisson distribution as a headline on its front page today. Supposedly, it has something to do with predicting the number of goals a team will score in the World Cup. The Poisson distribution is P(n) = λn e-λ/n! This gives the probability,…
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Spending pounds and bending light (two ways)
I spent the early part of the week in Sheffield at the first meeting of the Institute of Physics Astroparticle Physics Group. There were talks on the search for the Dark Matter, gravitational waves, neutrino astrophysics, gamma-ray astrophsyics, and, of course, cosmology. All of this sometimes goes by the name “non-accelerator particle physics”: trying to…
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Inspiration
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The Oakland Tribune has an article about Marc Davis, a professor at Berkeley. When I was doing research there, I was lucky to have Marc in the office next door: a brilliant astrophysicist who has done as much as anyone of his generation to understand the large-scale structure of the Universe, he is more recently…
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What We Talk About When We Talk About Probability
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In his most recent post, Cosmic Variance’s Mark Trodden talks about one of the presentations we both saw at last week’s meeting in Ishcia, where he explains one of the hot new techniques for analyzing cosmological data, the (so-called) Bayesian Evidence. Let’s unpack this term. First, “Bayesian”, named after the Reverend Thomas Bayes. The question…
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Cosmology in the Mediterranean
Like fellow-blogger Mark Trodden , I’ve just spent the week at scientific meetings in Ischia, an island off the coast of Naples. The first half of the week was for the yearly consortium meeting of the Planck Surveyor satellite. Although still endangered by further delays, we expect the satellite to be launched in early or…
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Blake and Newton
Polymath author Peter Ackroyd was interviewed on BBC Radio 4’s “Start the Week”, discussing his new biography of Isaac Newton. Ackroyd contrasted Newton to one of his previous biographical subjects, William Blake, who detested Newton and all that he did: I must Create a System, or be enslav’d by another Mans I will not Reason…
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SALT
The New York Times, recently redesigned (discussed ad nauseum, notably by Slate’s Jack Shafer), has an article about SALT, the South African Large Telescope, now the Southern hemisphere’s largest telescope. This is just one of a series of scientific and technological investements being made in South Africa (by combinations of the South African and “western”…
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Minos observes neutrino mass
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More evidence for neutrino mass has been seen by the MINOS Experiment in the Soudan mine in Minnesota. More precisely, the experiment extends and corroborates evidence for neutrino mass that has been gathering over the past 40 years, speeding up mightily in the last decade. The first evidence was the deficit of neutrinos from the…
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Eclipse sick day
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Sorry I’ve been so quiet lately! The term is over, and our version of Spring Break has begun — more time for blog posts. Without any pressing teaching engagements, I’m home sick from work today. Instead of doing what I ought (getting rest, or at least reading my students’ excellent PhD theses), I spent a…
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WMAP
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As promised, the team behind the WMAP (Wilkinson Microwave Anisotropy Probe) satellite have released their lovely new results. WMAP measures fluctuations in the CMB (which I’ve already written about a lot), and in 2003 they released high-resolution, high-sensitivity maps of the CMB over the whole sky. Today, they updated those maps, and also released new…
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