96 citations · 341 across the 16 of their papers we have counts for
16 papers
Nonlinear hydrodynamics in spinning neutron stars: Theoretical universal relations and equilibrium solutions
Hang Yu, Giorgio Nicolini, Shu Yan Lau +6
We study tides during the inspiral of a binary neutron star system, including nonlinear hydrodynamical interactions. Using an affine approximation that treats the perturbed neutron…
ESO Expanding Horizon White Paper: Revealing the properties of matter at supranuclear densities with gravitational waves
Tim Dietrich, Tanja Hinderer, Micaela Oertel +40
Understanding dense matter under extreme conditions is one of the most fundamental puzzles in modern physics. Complex interactions give rise to emergent, collective phenomena. Whil…
Axion condensates in neutron stars and radial oscillation modes
Antonio Gómez-Bañón, Pantelis Pnigouras, José A. Pons
Light QCD axions, introduced to solve the strong CP problem, may form condensates inside neutron stars, giving rise to a novel ground state of dense matter. We investigate how such…
Dynamical neutron-star tides: The signature of a mode resonance
P. Pnigouras, N. Andersson, F. Gittins +1
Motivated by future opportunities in gravitational-wave astronomy and the ongoing effort to constrain physics under extreme conditions, we consider the signature of individual mode…
Nonlinear coupling between magnetar QPOs
Pantelis Pnigouras, Samuel K. Lander
The quasi-periodic oscillations (QPOs) observed in the tails of magnetar giant -ray flares have long been interpreted as normal oscillation modes of these stars. However, most s…
Neutron star g-modes in the relativistic Cowling approximation
Rhys Counsell, Fabian Gittins, Nils Andersson +1
Mature neutron stars are expected to exhibit gravity g-modes due to stratification caused by a varying matter composition in the high-density core. By employing the BSk equation of…
Rotating Love: The dynamical tides of spinning Newtonian stars
Pantelis Pnigouras, Fabian Gittins, Amlan Nanda +2
We carefully develop the framework required to model the dynamical tidal response of a spinning neutron star in an inspiralling binary system, in the context of Newtonian gravity,…
Dynamical tides in superfluid neutron stars
Andrea Passamonti, Nils Andersson, Pantelis Pnigouras
We study the tidal response of a superfluid neutron star in a binary system, focussing on Newtonian models with superfluid neutrons present throughout the star's core and the inner…
Dynamical tides in neutron stars: The impact of the crust
Andrea Passamonti, Nils Andersson, Pantelis Pnigouras
We consider the dynamical tidal response of a neutron star in an inspiralling binary, focussing on the impact of the star's elastic crust. Within the context of Newtonian gravity,…
Gravitational-wave-driven tidal secular instability in neutron star binaries
Pantelis Pnigouras
We report the existence of a gravitational-wave-driven secular instability in neutron star binaries, acting on the equilibrium tide. The instability is similar to the classic Chand…
The phenomenology of dynamical neutron star tides
N. Andersson, P. Pnigouras
We introduce a phenomenological, physically motivated, model for the effective tidal deformability of a neutron star, adding the frequency dependence (associated with the star's fu…
Dark stars: gravitational and electromagnetic observables
Andrea Maselli, Pantelis Pnigouras, Niklas Gønlund Nielsen +2
Theoretical models of self-interacting dark matter represent a promising answer to a series of open problems within the so-called collisionless cold dark matter (CCDM) paradigm. In…
Saturation of the f-mode instability in neutron stars: II. Applications and results
Pantelis Pnigouras, Kostas D. Kokkotas
We present the first results on the saturation of the f-mode instability in neutron stars, due to nonlinear mode coupling. Emission of gravitational waves drives the f-mode (fundam…
The stochastic background of gravitational waves due to the f-mode instability in neutron stars
Marco Surace, Kostas D. Kokkotas, Pantelis Pnigouras
This paper presents an estimate for the spectral properties of the stochastic background of gravitational waves emitted by a population of hot, young, rapidly rotating neutron star…
A gravitational wave afterglow in binary neutron star mergers
Daniela D. Doneva, Kostas D. Kokkotas, Pantelis Pnigouras
We study in detail the f-mode secular instability for rapidly rotating neutron stars, putting emphasis on supermassive models which do not have a stable nonrotating counterpart. Su…
Saturation of the f-mode instability in neutron stars: I. Theoretical framework
Pantelis Pnigouras, Kostas D. Kokkotas
The basic formulation describing quadratic mode coupling in rotating Newtonian stars is presented, focusing on polar modes. Due to the Chandrasekhar-Friedman-Schutz mechanism, the…