https://doi.org/10.1140/epja/i2015-15119-7
Regular Article - Theoretical Physics
Small radii of neutron stars as an indication of novel in-medium effects
1
Department of Physics, Southeast University, 211189, Nanjing, China
2
Department of Physics and Astronomy, Texas A&M University-Commerce, 75429, Commerce, TX, USA
3
Center for Exploration of Energy and Matter, Indiana University, 47408, Bloomington, IN, USA
* e-mail: wzjiang@seu.edu.cn
Received:
31
May
2015
Revised:
13
August
2015
Accepted:
6
September
2015
Published online:
28
September
2015
At present, neutron star radii from both observations and model predictions remain very uncertain. Whereas different models can predict a wide range of neutron star radii, it is not possible for most models to predict radii that are smaller than about 10km, thus if such small radii are established in the future they will be very difficult to reconcile with model estimates. By invoking a new term in the equation of state that enhances the energy density, but leaves the pressure unchanged we simulate the current uncertainty in the neutron star radii. This new term can be possibly due to the exchange of the weakly interacting light U-boson with appropriate in-medium parameters, which does not compromise the success of the conventional nuclear models. The validity of this new scheme will be tested eventually by more precise measurements of neutron star radii.
© SIF, Springer-Verlag Berlin Heidelberg, 2015
