Quanta: Any Single Galaxy Reveals the Composition of an Entire Universe

[notFritzArgelander]

Well to a neural network that looks at simulated galaxies. Translation to physical objects in our cosmos awaits further studies.

https://www.quantamagazine.org/with-one ... d21d14a9ea

[ThinkerX]

uhh...are there not at least some atypical galaxies out there. Ones devoid or almost devoid of dark matter, or with dominant populations of low metallicity stars? Seems to me that those galaxies might not fit well with this...

[notFritzArgelander]

uhh...are there not at least some atypical galaxies out there. Ones devoid or almost devoid of dark matter, or with dominant populations of low metallicity stars? Seems to me that those galaxies might not fit well with this...

Sure. But.... One thing that all galaxies would share is the primordial lithium abundance in the least metallic stars. It turns out that that parameter alone will give the dark to normal matter ratio at the Big Bang. If this work is applicable to the physical universe and not some dull tautology of circular reasoning in the neural nets then they may be backing themselves into rediscovering the importance of primordial lithium. It's the only parameter I can think of that is independent of galaxy type and history and a unique indicator of cosmological conditions.