Compact stars in $f(T)$ extended theory of gravity

We consider static spherically symmetric self-gravitating configurations of the perfect fluid within the framework of the torsion-based extended theory of gravity. In particular, we use the covariant formulation of $f(T)$ gravity with $f(T)=T+\frac{\alpha }{2}{T}^2$, and for the fluid, we assume the polytropic equation of state with the adiabatic exponent $\mathrm{\Gamma }=2$. The constructed solutions have a sharply defined radius [as in General Relativity (GR)] and can be considered as models of nonrotating compact stars. The particle number–to–stellar radius curves reveal that with positive (negative) values of $\alpha$ a smaller (greater) number of particles can be supported against gravity then in GR. For the interpretation of the energy density and the pressure within the star, we adopt the GR picture where the effects due to nonlinearity of $f(T)$ are seen as a $f(T)$ fluid, which together with the polytropic fluid contributes to the effective energy momentum. We find that sufficiently large positive $\alpha$ gives rise to an abrupt sign change (phase transition) in the energy density and in the principal pressures of the $f(T)$ fluid, taking place within the interior of the star. The corresponding radial profile of the effective energy density is approximately constant over the central region of the star, mimicking an incompressible core. This interesting phenomenon is not found in configurations with negative $\alpha$.

Figure 1

Particle number–to–stellar radius curves for polytropes with adiabatic exponent $\mathrm{\Gamma }=2$ computed within GR ($a=0$, dashed line) and within the nonlinear $f(T)$-gravity theory ($a=\pm 0.1$, $\pm 1$, $\pm 10$, solid lines).

Figure 2

The $\mathrm{\Gamma }=2$ polytrope (EoS $\rho =\kappa p^{1/2}+p$) with maximal ${\sigma }_0$ in $f(T)=T+\frac{\alpha }{2}{T}^2$-gravity theory, $a=\alpha {\kappa }^2=1$. Upper plot: energy density $\rho$ of the polytropic fluid (dashed line), energy density $\tilde{\rho }$ of the $f(T)$ fluid in the GR picture (solid line), and effective energy density $\rho +\tilde{\rho }$ (dotted line). Lower plot: isotropic pressure $p$ of the polytropic fluid (dashed line), radial pressure $\tilde{p}$ (solid black line), and transverse pressure $\tilde{q}$ (solid grey line) of the $f(T)$ fluid.

Figure 3

The $\mathrm{\Gamma }=2$ polytrope with maximal ${\sigma }_0$ in $f(T)=T+\frac{\alpha }{2}{T}^2$-gravity theory, $a=\alpha {\kappa }^2=-1$. Energy density $\rho$ of the polytropic fluid (dashed line), energy density $\tilde{\rho }$ of the $f(T)$ fluid in the GR picture (solid line), and effective energy density $\rho +\tilde{\rho }$ (dotted line).