# Would DCBH form supermassive stars first before BH formation

In reading some literature it seems ambiguous (intentionally?) as to the path that Direct Collapse Black Holes (DCBH) take. Some papers do talk about pristine Halos collapsing to form supermassive stars (SMS) ($$10^{3}$$) that then undergo direct collapse. However most that I've seen do not.

So my question is, do all DCBH models assume a short lived SMS phase or can there be a runaway collapse/accretion in the core of a H cloud that collapses into a intermediate mass black hole or larger? Are there multiple routes for DCBH? This is all assuming $$z>15$$ and $$\Lambda$$CDM.

• Is that supposed to be $10^3M_\odot$ ? Collapsing gas clouds get hot, and its not easy to shed that heat, especially if the gas has low metallicity. What are you proposing that would prevent fusion from occuring? – PM 2Ring Jul 20 '20 at 20:24