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https://www.nature.com/articles/nature25792 https://www.nature.com/articles/nature25792 is the more interesting article, I think, as it describes the experiment
by cozzyd 9y ago
https://www.nature.com/articles/nature25792 https://www.nature.com/articles/nature25792 is the more interesting article, I think, as it describes the experimental measurement that forms the basis for the claim about early-universe gas temperature.
Being the skeptic I am, I suspect that it's more likely that there is some systematic error that is being underestimated or overlooked rather than new physics. Fortunately the experiment is simple enough that it can be reproduced elsewhere relatively easily.
Interestingly, the region around 75 MHz is between two ITU broadcasting allocations. They claim to rule out the FM band as the source of the higher spectral edge through several possible channels, but I wouldn't be surprised if there was some way to get excess power in those bands in some way they hadn't considered (although I guess any strange propagation mechanisms would probably be time-dependent).
- SiempreViernes 9y agoLast I heard, reionization was not understood in detail so I find it surprising the author here is confident they found a dark matter signature. Not being able to read more than the abstrac I can’t say for sure, but it also looks like this is not an experimental paper but a theoritician trying to put put a quick paper: no mention of the instrument in the abstract nor comparison to existing exclusion limits on the dm today.
- anon24476 9y ago> Not being able to read more than the abstrac https://sci-hub.tw/10.1038/nature25792 https://sci-hub.tw/10.1038/nature25792
- Tepix 9y agoThat paper is online at https://astronomy.fas.harvard.edu/files/astronomy/files/bowman_et_al.pdf https://astronomy.fas.harvard.edu/files/astronomy/files/bowm...
- cozzyd 9y agoThere are two simultaneous papers in Nature (which I linked to), one describing the experimental result from the EDGES, the other an explanation for the result.