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At present, neutron star radii from both observations and model predictionsremain very uncertain. Whereas different models can predict a wide range ofneutron star radii, it is not possible for most models to predict radii thatare smaller than about 10 km, thus if such small radii are established in thefuture they will be very difficult to reconcile with model estimates. Byinvoking a new term in the equation of state that enhances the energy density,but leaves the pressure unchanged we simulate the current uncertainty in theneutron star radii. This new term can be possibly due to the exchange of theweakly interacting light U-boson with appropriate in-medium parameters, whichdoes not compromise the success of the conventional nuclear models. Thevalidity of this new scheme will be tested eventually by more precisemeasurements of neutron star radii.

Small radii of neutron stars as an indication of novel in-medium effects