7 ms·
Any chance you know of a list of such anomalies?
by beaner 7y ago
Any chance you know of a list of such anomalies?
- est31 7y agoMaybe this? https://en.wikipedia.org/wiki/Category:Hypothetical_elementary_particles https://en.wikipedia.org/wiki/Category:Hypothetical_elementa...
- MrEldritch 7y agoI do not, but I can think of a few off the top of my head - the muon g-2 anomaly, the Antarctic upward-moving particle anomaly, the Hubble constant tension, the proton radius puzzle was one until quite recently (but is now largely resolved), the (not statistically significant yet, but they've been in the data since 2013 and they keep not going away) hints of lepton universality violation at the LHC...
- knzhou 7y agoLet's also add the PVLAS anomaly, the white dwarf cooling hint, the 'too big to fail' problem, the cusp/core problem, missing satellites, the DAMA/LIBRA anomaly, the MiniBooNE excess, the Valentine's day monopole, the reactor neutrino anomaly, the Hooperon, the AMS positron excess...
- dodobirdlord 7y agoPerhaps these two lists will be of interest? https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_physics https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_p... https://en.wikipedia.org/wiki/Physics_beyond_the_Standard_Model#Phenomena_not_explained https://en.wikipedia.org/wiki/Physics_beyond_the_Standard_Mo...
- knzhou 7y agoYou can go straight to review articles, which are generally available for free on the arXiv. Or if you want the firehose, you can scan for papers whose abstracts contain words like 'hint', 'anomaly', 'excess', 'discrepancy', and so on [0]. No individual has made a global list across all fields, because this would be a thankless and kind of pointless task; nobody has the time to be interested in every anomaly. 0: https://arxiv.org/search/advanced?advanced=&terms-0-operator=AND&terms-0-term=anomaly+OR+excess+OR+hint+OR+discrepancy&terms-0-field=all&classification-physics=y&classification-physics_archives=all&classification-include_cross_list=include&date-filter_by=all_dates&date-year=&date-from_date=&date-to_date=&date-date_type=submitted_date&abstracts=show&size=50&order=-announced_date_first https://arxiv.org/search/advanced?advanced=&terms-0-operator...
- PhantomGremlin 7y agoOne of my favorite "anomalies" is dark matter. Not much explanation for it so far. One of my favorite quips on HN put it thusly: GR only matches observation because you added in 20x more stuff that is undetectable other than as a deviation from the predictions of GR. https://news.ycombinator.com/item?id=19537192 https://news.ycombinator.com/item?id=19537192
- knzhou 7y agoThat's a witty quip, but it's witty because it's unfair. We don't grade theories based on what fraction of the stuff is obviously visible. If that were true, even electromagnetism would be a terrible theory because the vast majority of the spectrum we consider is invisible to human eyes. What always matters is how well the theory predicts given how simple its assumptions are, and dark matter is great at that.
- ryacko 7y agoDark matter is a fudge factor.
- knzhou 7y agoYou can call anything a fudge factor. One person's fudge factor is another's elegant explanation.
- jacquesm 7y agoFudge factors are natures Magic Constants. There's a #define in there somewhere.
- dogma1138 7y agoIsn’t the cosmological constant the OG fudge factor in GR? AFAIK we need dark matter to explain any theory of gravity, the observations don’t match what we would expect form classical mechanics either which is still the go to theory for things like galaxies. MOND was introduced initially to fix the observations mostly in regards to how we understand Newtonian mechanics, the relativistic versions of MOND can be used as an alternative to GR but these have been more or less debunked with the observations of gravitational waves since afaik all the versions of MOND have “instant gravity” just like Newtonian mechanics.
- CabbageRice 7y agohttps://en.wikipedia.org/wiki/Axis_of_evil_(cosmology) https://en.wikipedia.org/wiki/Axis_of_evil_(cosmology)