Tag: cosmology
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Cosmic variance
Or, everyone in the world is French M. Luc Arnaud farmed a small plot somewhere in the south of France. Exactly when and exactly where M. Arnaud’s farm was is now no longer remembered, but we can be sure that he had a few cows, a few pigs, a few chickens and one rather moth-eaten…
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Measuring line-of-sight shear with Einstein rings
Today I released a paper written in collaboration with Pierre Fleury, Julien Larena and Matteo Martinelli on how we can measure line-of-sight shear from Einstein rings. But what is line-of-sight shear, and why are we interested in measuring it in the first place? To answer these questions, let’s review the phenomenon of strong gravitational lensing.…
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Why I have a website (and why you should too)
Academics can often be rather squeamish about self-promotion. I myself am not a fan of writing endless cover letters and research statements where I have to act as the sole and assiduously devoted marketer and salesperson for the brand that is Natalie B. Hogg: CosmologistTM. But the squeamishness, and the attendant procrastination that can turn…
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The howling Universe
Before I moved from IFT to IPhT, I filmed a video all about what standard sirens are and why they’re useful for cosmology. The video is now on Youtube, in English with Spanish subtitles. Take a look!
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Implicit none
The first programming language I ever learned was Fortran. And before you ask, no, I’m not seventy years old. It just so happened that during my undergraduate degree, I took two courses on numerical methods for physics which were taught in Fortran, and for good reason: Fortran is still one of the best languages to…
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My first N months as a postdoc (where 0 < N < 12)
How long have I been a postdoc? It’s a little difficult to quantify. I finished my PhD thesis in December 2020, and submitted it in January 2021. I passed my viva in February 2021. I spent a few months climbing the walls waiting for my Spanish visa, and trying to do research at the same…
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The road (back) to Madrid
On Friday last week I signed my contract and started my job as a postdoctoral researcher at the IFT in Madrid. It feels extremely good to type that. I have also been waiting a very long time to write this post. I was offered this job on the 12th of April 2020 — when the…
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Running, paper revisions, talk writing
I started this morning in unusually energetic fashion, by going for a run before starting work. It was a bit chilly but the sky was clear blue and the sun was shining. The birds were singing and the blackthorn blossom has topped the newly green trees and hedges with a creamy white glaze. The daffodils…
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Philosophy and cosmology
I’ve decided it’s time to improve the consistency of my writing and practice makes perfect, as they say. So, starting from today, I’m going to a write a blog post every day for thirty days (excluding weekends and holidays). By my calculation, this means the last post in the thirty day sequence will come on…