Looking inside neutron stars: Microscopic calculations confront observations

Microscopic Equations of States for neutron star interiors

This page contains supplemental material for arXiv:1006.4062 by Aleksi Kurkela, Paul Romatschke, Aleksi Vuorinen and Bin Wu

Tabulated Equations of state:
The file alleos_18_6_2010.zip contains the set of EoSs used, generated using Mathematica files available here.
The EoSs are composed of:

Low density EoS for densities less than 0.08/fm^3 from Nucl.Phys.A207:298-320,1973 and Astrophys.J.170:299-317,1971.
Nucleonic EoS from nucl-th/9804027
3-loop perturbative EoS including effects of strange mass from 0912.1856

The file names contain information on the parameter values used. The names are generated as follows:

EoS_H0L#X#ms#D#M#mix#.dat

where the

# after L is: the scale parameter LambdaMsbar (in GeV) in MSbar scheme.
# after X is: the renormalization scale Lambdabar/(mu_B/3).
# after ms is: the MSbar strange quark mass (in GeV) at scale 2GeV.
# after D is: the value of the gap parameter Delta (in GeV).
# after M is: the baryon number chemical potential mu_B (in GeV) where the matching occured (point where the pressures of the pure phases are equal).
# after mix is: 0 for no mixing (Maxwell construction), 1 for mixing (Glendenning construction).

The format of the files is:

Baryon number chemical potential[GeV], Pressure[GeV/fm^3], Energy Dens.[GeV/fm^3], Baryon Dens.[1/fm^3]

In addition, in the case of mixed equations of state, the onset and the offset chemical potentials for the complex first order transition are indicated in the last line by muStart and muEnd, respectively.

The EoSs appearing in the Table III are:

#	EoS file	Comments
1	EoS_H0L0.378X3.5ms0.0922D0.1M0.955379mix0.dat	Global best fit
2	EoS_H0L0.346X4.ms0.0922D0.M0.9595mix0.dat	Best w/o CSC (D=0)
3	EoS_H0L0.346X4.00ms0.0922D0.1M1.43mix1.dat	Best mixed
4	EoS_H0L0.346X3.00ms0.0922D0.M1.617mix1.dat	Best mixed w/o CSC
5	EoS_H0L0.378X4.ms0.0922D0.1M1.22168mix0.dat	Worst with CSC and w/o mixing
6	EoS_H0L0.346X4.00ms0.0922D0.M1.49226mix0.dat	Worst w/o CSC or mix
7	EoS_H0L0.346X4.00ms0.0922D0.M1.49226mix1.dat	Worst w/o CSC
8	EoS_H0L0.346X4.00ms0.0922D0.1M1.257mix1.dat	Global worst fit

The chi^2 values for the equations of states with respect to the observational data are given here.

For questions & comments please contact A. Kurkela via email: "kurkela AT phys.ethz.ch"
Last update: 22.06.2010