Axisymmetric equilibrium models for magnetised neutron stars in Scalar-Tensor Theories

Understand

Among the possible extensions of General Relativity that have been put forward in order to address some long standing issues in our understanding of the Universe, Scalar-Tensor Theories have received a lot of attention for their simplicity.

• Interestingly, some of these predict a potentially observable non-linear phenomenon, known as \textit{spontaneous scalarisation}, in the presence of highly compact matter distributions, like the case of neutron stars.
• Neutron stars are ideal laboratories to investigate the properties of matter under extreme conditions, and in particular they are known to harbour the strongest magnetic fields in the Universe.
• Here, for the first time, we present a detailed study of magnetised neutron stars in Scalar-Tensor Theories.