199 citations · 777 across the 15 of their papers we have counts for
15 papers
Probing Dark Star Parameters Through -Mode Gravitational Wave Signals
Mariachiara Celato, Christian J. Krüger, Kostas D. Kokkotas
Theoretical models of self-interacting dark matter offer a promising solution to several unresolved issues within the collisionless cold dark matter framework. For asymmetric dark…
Impact of the relativistic Cowling approximation on shear and interface modes of neutron stars
C. J. Krüger, H. Sotani
We investigate shear and interface modes excited in neutron stars with an elastic crust in the full general relativistic framework and compare them to the results obtained within t…
Rapidly rotating neutron stars: Universal relations and EOS inference
Christian J. Krüger, Sebastian H. Völkel
We provide accurate universal relations that allow to estimate the moment of inertia and the ratio of kinetic to gravitational binding energy of uniformly rotating neutro…
Constraining the Nuclear Equation of State from Rotating Neutron Stars
Sebastian H. Völkel, Christian J. Krüger
We demonstrate how observables of slowly rotating neutron stars can be used to constrain the nuclear equation of state. By building a Bayesian framework we demonstrate how combinin…
Fast Rotating Neutron Stars: Oscillations and Instabilities
Christian J. Krüger, Kostas D. Kokkotas, Praveen Manoharan +1
In this review article, we present the main results from our most recent research concerning the oscillations of fast rotating neutron stars. We derive a set of time evolution equa…
Universal Relations for Binary Neutron Star Mergers with Long-lived Remnants
Praveen Manoharan, Christian J. Krüger, Kostas D. Kokkotas
We present a novel universal relation for binary neutron star mergers with long-lived neutron star remnants: inspired by recent work based on numerical relativity simulations, we p…
Bayesian Inverse Problem of Rotating Neutron Stars
Sebastian H. Völkel, Christian J. Krüger, Kostas D. Kokkotas
In this work we provide a framework that connects the co-rotating and counter rotating -mode frequencies of rotating neutron stars with their stellar structure. The accurate com…
Oscillation dynamics of scalarized neutron stars
Christian J. Krüger, Daniela D. Doneva
Scalar-tensor theories are well studied extensions of general relativity that offer deviations which are yet within observational boundaries. We present the time evolution equation…
Dynamics of Fast Rotating Neutron Stars: An Approach in the Hilbert Gauge
C. J. Krüger, K. D. Kokkotas
We describe a set of time evolution equations and its numerical implementation for the investigation of non-axisymmetric oscillations of rapidly rotating compact objects in full Ge…
Spin-induced scalarization of Kerr black holes with a massive scalar field
Daniela D. Doneva, Lucas G. Collodel, Christian J. Krüger +1
In the present paper we study the onset of the spin-induced scalarization of a Kerr black hole in scalar-Gauss-Bonnet gravity with a massive scalar field. Our approach is based on…
Black hole scalarization induced by the spin -- 2+1 time evolution
Daniela D. Doneva, Lucas G. Collodel, Christian J. Krüger +1
The scalarization is a very interesting phenomena allowing to endow a compact object with scalar hair while leaving all the predictions in the weak field limit unaltered. In Gauss-…
Estimates for Disk and Ejecta Masses Produced in Compact Binary Mergers
C. J. Krüger, F. Foucart
There is irresistible observational evidence that binary systems of compact objects with at least one neutron star are progenitors of short gamma-ray bursts, as well as a productio…
Fast Rotating Relativistic Stars: Spectra and Stability without Approximation
C. J. Krüger, K. D. Kokkotas
We study oscillations and instabilities of relativistic stars using perturbation theory in general relativity and take into account the contribution of a dynamic spacetime. We pres…
Seismology of adolescent neutron stars: Accounting for thermal effects and crust elasticity
C. J. Krüger, W. C. G. Ho, N. Andersson
We study the oscillations of relativistic stars, incorporating key physics associated with internal composition, thermal gradients and crust elasticity. Our aim is to develop a for…
Gravitational wave asteroseismology of fast rotating neutron stars with realistic equations of state
Daniela D. Doneva, Erich Gaertig, Kostas D. Kokkotas +1
In the present paper we study the oscillations of fast rotating neutron stars with realistic equations of state (EoS) within the Cowling approximation. We derive improved empirical…