Saturation of the f-mode Instability in Neutron Stars

Pantelis Pnigouras (Autor)

Buch | Softcover

XXIII, 220 Seiten

2019
Springer International Publishing (Verlag)
978-3-030-07474-6 (ISBN)

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This book presents a study of the saturation of unstable f-modes (fundamental modes) due to low-order nonlinear mode coupling. Since their theoretical prediction in 1934, neutron stars have remained among the most challenging objects in the Universe. Gravitational waves emitted by unstable neutron star oscillations can be used to obtain information about their inner structure, that is, the equation of state of dense nuclear matter. After its initial growth phase, the instability is expected to saturate due to nonlinear effects. The saturation amplitude of the unstable mode determines the detectability of the generated gravitational-wave signal, but also affects the evolution of the neutron star. The study shows that the unstable (parent) mode resonantly couples to pairs of stable (daughter) modes, which drain the parent's energy and make it saturate via a mechanism called parametric resonance instability. Further, it calculates the saturation amplitude of the most unstable f-mode multipoles throughout their so-called instability windows.

Introduction.- The Oscillation Modes: Linear Perturbation Scheme.- The f-mode Instability.- Mode Coupling: Quadratic Perturbation Scheme.- Results.- Final Remarks.

Erscheinungsdatum	04.02.2019
Reihe/Serie	Springer Theses
Zusatzinfo	XXIII, 220 p. 31 illus., 21 illus. in color.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Gewicht	379 g
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Astronomie / Astrophysik
Schlagworte	Asteroseismology • CFS Instability • f-Mode • gravitational waves • Neutron Star Oscillations • Nonlinear Coupling • Parametric resonance • Saturation of Modes • Theoretical Astrophysics
ISBN-10	3-030-07474-9 / 3030074749
ISBN-13	978-3-030-07474-6 / 9783030074746
Zustand	Neuware