H.Velten: Newtonian View of General Relativistic Stars

[Maxim Khlopov]

VIA lecture by Prof. Hermano Velten "Newtonian View of General Relativistic Stars" took place on 31.10.2014 Its record is in the library:
http://viavca.in2p3.fr/hermano_velten.html
The following questions and comments were made in the Discussion:
Shantanu: maybe you will discuss this later, but I presume in Newtonian cosmology pressure does not appear anywhere unlike in GR?
Shantanu: In (1) is this put in by hand, or can this be derived using only Newtonian gravity?
In other words: replace rho by rho + 3 *P?
Nauenberg: I don't understand your units.
Nauenberg: rho is the mass density, not the energy density.
Nauenberg: sorry this distinction has nothing to do with setting c=1.
Nauenberg: are you combining mass and pressure?
Nauenberg: the dash line is the case where c is infinite, not 1
Shantanu: Let me ask one (although not directly related to teh subject matter of your talk). AS you showed earlier Lane-Emden's equtions used in Newtonian gravity demonstrate that pressure opposes gravity, whereas one reason you have black holes is because pressure gravitates (as indicated by TOV equation). My question is at what point the switch happens? Is there any literature on this? In other words: at what densities does pressure gravitate ?
Nauenberg: I have written a paper in 1972 that anwers this question
Shantanu: Ok, thanks, Mike. Could you point to the reference?
Shantanu: But isn't the TOV curve correct and agrees with what is in textbooks?
Nauenberg: the book I mentioned is
"Black holes, white dwarfs, and neutron stars : the physics of compact objects" Stuart L. Shapiro, Saul A. Teukolsky.
New York Wiley, 1983
I recall that it devotes nearly a chapter to a discussion of our work, but I don't
have a copy to check the pages

The reference to the paper by Chapline and Nauenburg is
Astrophysical Journal, Vol. 179, pp. 277-288 (1973)
Its text is attached to this post