Narlikar and Eric Lerner on introduction of dark matter

[alaric63]

This series is really just the best!

And ya know, if you want to understand the cosmos, I guess you should ask an astronomer. Preferably one who is as good as this fellow.

Amazing.

[sbergman27]

Lerner & Narlikar need to get their facts straight. Observed D, He3, and He4 prevalence agrees well with theory. Only Li7 is off. So our BBN model is good, but not perfect. And the only free parameter in BBN is the baryon-photon ratio. Dark Matter has nothing do with it. Contending that it does seriously compromises their credibility. Obviously, they don't understand BBN very well. But they are counting upon casual viewers not noticing that.

[hiddenblood]

@sbergman27 "Related to origin and expansion conditions alone, we now have the Hubble constant h (= expansion rate); the cosmological constant Λ (= pressure resisting gravity); the cosmic deceleration parameter q0 (= expansion deceleration); the density parameter Ω (= ratio of actual matter density to density needed for flat universe), subdivided into the density for ordinary matter and that for invisible dark matter; and the bias parameter b (= measures lumpiness of matter distribution).