Scott Dodelson
@ScottDodelson
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Opinions are mine, not my employer’s
Fermilab University of Chicago
Joined September 2024
New edition, new cover. h/t co-author Fabian Schmidt
shop.elsevier.com
Modern Cosmology, Third Edition provides a detailed introduction to the field of cosmology. Beginning with the smooth, homogeneous universe described
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Probably a very bad idea to debate MOND with someone who's been thinking about it for 30 years given that I have not thought about it in over a decade ... Advice welcome!
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It's easy to forget how amazing -- aesthetically, technologically, and of course scientifically -- this is.
Picture of SPT winterover Karia Dibert cleaning the snow off the cabin roof of the telescope, a few days after #equinox #sunset at the South Pole! #Antarctica @NSF
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Not yet willing to concede that I'm wrong, but getting there. Can't wait to see what the final #DES result is. Coming in the next few months!
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That is very surprising to me: I thought we have been working on the zeroth order studies for ~100 years and have those nailed, but we are just starting over the past 30 to study inhomogeneities precisely, so that's where the surprises would be.
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Taken at face value this means that the theory does great predicting inhomogeneities. The lingering tensions are the Hubble tension and the distance measurements by DESI and Supernova. Taken at face value that means the theory does worse explaining the zeroth order universe.
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Science means changing your mind. Last week, I wrote that the "S8 tension" (the apparent difference in the amount of clustering seen at early times vs. late times as predicted by the fiducial model) was exciting. Today this from the KiloDegreeSurvey (KiDS)
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Mother and child from ... my child [ok, she's 32 now, but still]
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1. My prior against w0wa is really high and sure the chi2 is better but there are more parameters [i know they try to account for that] and 2. the spread in SN might be taken as an overall systematic in the method instead of choosing the error bars of just one
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Have not read the DESI papers carefully enough ... but my initial reaction is this seems to be best argument against LCDM and I am not convinced for several reasons in the thread. My tension ranking: (i) Hubble, (ii) S8, (iii) BAO-SN-CMB with (ii) the most interesting
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The yellow points were from the Planck satellite. The curve was the best fit model to the Planck data. ACT's new (blue) points go right through this best fit model, reducing several possible tensions that people were excited about. Ie the fiducial model fits the data very well
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Exquisite polarization results from #ACT. The fidicual cosmological model is in amazing shape ;(
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Decent paper saying the universe could be flat and that armed with our knowledge of the Hubble rate, we can infer the density of matter. A bit weird that it only has 154 citations, but the first author had an h-index of only 37, so probably no one paid much attention to his work.
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Four papers culminating in https://t.co/LFDEZB3YD5. I was honored to be on the "IR" committee for the final paper. Kudos to the entire team, especially Dhayaa, Chihway, and Alex
arxiv.org
We present cosmological constraints from the Dark Energy Camera All Data Everywhere (DECADE) cosmic shear analysis. This work uses shape measurements for 107 million galaxies measured through Dark...
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The hottest (ok, maybe second hottest) tension in LambdaCDM is the S8 tension: the clustering at late times seems lower than is predicted by the model given what we know from the CMB. DECADE and Anbajagane et al weigh in. Amazing story on how competitive they are!
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They just published an upper limit but this method could one day lead to a discovery. Beams from accelerators are a great way to search for dark matter.
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How are neutrinos related to the Higgs boson or dark matter? #microboone is searching for sterile neutrinos. The beam used produces kaons, which could produce scalar particles that couple to the Higgs boson (and also to dark matter), which then decay into e+/e-...
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the one constant since 2013 when @waitbutwhy first appeared is that I am still interested in what Tim Urban has to say ...
I still cannot believe that I can: - look at a world map and tap anywhere to zoom in at street level - instantly access any song, book, movie, tv show, or podcast ever made - have any conceivable question and get an immediate answer or video explanation - take a photo or
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Tom Crawford is in a position potentially impacted by the confusion surrounding the rapid #DOGE rollouts. Tom himself is so outstanding and has so much support that I doubt he is at risk, but others might be, so I hope things get straightened out soon. Meantime, how nice of him!
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