[Mesa-users] Question about GR corrections for SMS

[Rob Farmer]

Hi,

>Is there anything along the lines of the TOV approximation? Was
use_gr_factors intended for SMS?

No only the changes to s% grav are implemented.

> which is why I wonder if the new version has this.

It is still there in 12778. But lots of other things will have changed
between versions, which may be stopping the star from getting to 10^6msun
(which is what i interpret your saying is the problem?). Or maybe you've
stumbled on a bug, it would be helpful if you could make a small test case
that shows this problem.

Rob



On Fri, 15 May 2020 at 18:59, Nicholas Herrington via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Hi,
>
> I am evolving some supermassive primordial stars (SMS) with accretion
> rates up to 1 Msun/yr. In the newest version of MESA is there general
> relativistic correction to G for SMS. I have found the control
> use_gr_factors with corrections to cgrav along the lines of
> (1-2GM/rc^2)^-0.5. Is there anything along the lines of the TOV
> approximation? Was use_gr_factors intended for SMS?
>
> I was running a SMS with version r11701 and with use_gr_factors off I get
> results exceeding 10^6 Msun which is expected, but with version r12778 and
> the same inlist (use_gr_factors = .false.), the star reaches 10^5. This is
> close to the final mass of the same star from other stellar evolution codes
> with post-newtonian corrections to G, which is why I wonder if the new
> version has this.
>
> Thanks
> Nick
>
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