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Rapidly rotating neutron stars with a massive scalar field - structure and universal relations
Daniela D. Doneva, Stoytcho S. Yazadjiev
We construct rapidly rotating neutron star models in scalar-tensor theories with a massive scalar field. The fact that the scalar field has nonzero mass leads to very interesting r…
Accretion disks around neutron and strange stars in gravity
Kalin V. Staykov, Daniela D. Doneva, Stoytcho S. Yazadjiev
We study the electromagnetic spectrum of accretion disks around neutron and strange stars in gravity. Both static and rapidly rotating models are investigated. The…
Slowly rotating neutron stars in scalar-tensor theories with a massive scalar field
Stoytcho S. Yazadjiev, Daniela D. Doneva, Dimitar Popchev
In the scalar-tensor theories with a massive scalar field the coupling constants, and the coupling functions in general, which are observationally allowed, can differ significantly…
Moment of inertia -- compactness universal relations in scalar-tensor theories and gravity
Kalin V. Staykov, Daniela D. Doneva, Stoytcho S. Yazadjiev
We are investigating universal relations between different normalisations of the moment of inertia and the compactness of neutron and strange stars. Slowly rotating as well as rapi…