Timeline for Is there a standard distance/z data set for cosmology given new measurements?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 29, 2020 at 15:05 | vote | accept | MikeHelland | ||
| Nov 23, 2020 at 16:16 | comment | added | Buzz | Let us continue this discussion in chat. | |
| Nov 23, 2020 at 15:32 | comment | added | Buzz | Hi @Layla . I understood what you are saying is that (1) a ΛCDM model is used to calculate Ho from CMB data, and (2) that another ΛCDM model is used to calculate Ho from astronomical data involving the behavior of supernovae. If I misunderstood your comment I apologize. From another source I thought regarding (1) that no ΛCDM model is used. | |
| Nov 23, 2020 at 7:53 | comment | added | seVenVo1d | @Buzz I did not understand your question.. | |
| Nov 23, 2020 at 1:22 | comment | added | Buzz | Hi @Layla . "We cannot directly measure H0 from CMB." I did not understand that CMB data led to any ΛCDM type model. I thought is was more like a local perturbation type of statistical model. | |
| Nov 22, 2020 at 21:13 | comment | added | seVenVo1d | We cannot directly measure $H_0$ from CMB. We have to decide on a model and then make calculations under that model to obtain $H_0$. So, obtaining $H_0$ from CMB is different than the local measurements. In local measurements we are not using any cosmological model, but purely observational data. | |
| Nov 22, 2020 at 21:12 | comment | added | seVenVo1d | @Buzz People are searching for it but it seems that the problem is not due to a systematic error, but due to our cosmological model (i.e., $\Lambda$CDM is wrong/incomplete etc.). Over the years there have been done many observations to obtain $H_0$ locally and most of them give higher $H_0$ (Only TRGB gives lower $H_0$ values which is interesting). | |
| Nov 22, 2020 at 19:52 | comment | added | Buzz | Hi @Layla . You obviously know a great deal more about this subject than I do. Consequently what I have deduced from my reading is likely to be wrong. I would much appreciate your insight about the following. The $H_0$ tension seems to be based on two different data sets used to fit a "best" model. (1) astronomical data using the standard candle based on super novae. (2) variations in the CMB pattern. Either or both may have flaws not yet investigated. | |
| Nov 22, 2020 at 19:13 | history | answered | seVenVo1d | CC BY-SA 4.0 |