Pseudospectrum of horizonless compact objects: A bootstrap instability mechanism
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Pseudospectrum of horizonless compact objects : A bootstrap instability mechanism. / Boyanov, Valentin; Destounis, Kyriakos; Macedo, Rodrigo Panosso; Cardoso, Vitor; Jaramillo, Jose Luis.
I: Physical Review D, Bind 107, Nr. 6, 064012, 15.03.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Pseudospectrum of horizonless compact objects
T2 - A bootstrap instability mechanism
AU - Boyanov, Valentin
AU - Destounis, Kyriakos
AU - Macedo, Rodrigo Panosso
AU - Cardoso, Vitor
AU - Jaramillo, Jose Luis
PY - 2023/3/15
Y1 - 2023/3/15
N2 - Recent investigations of the pseudospectrum in black hole spacetimes have shown that quasinormal mode frequencies suffer from spectral instabilities. This phenomenon may severely affect gravitationalwave spectroscopy and limit precision tests of general relativity. We extend the pseudospectrum analysis to horizonless exotic compact objects that possess a reflective surface arbitrarily close to the Schwarzschild radius and find that their quasinormal modes also suffer from an overall spectral instability. Even though all the modes themselves decay monotonically, the pseudospectrum contours of equal resonance magnitude around the fundamental mode and the lowest overtones can cross the real axis into the unstable regime of the complex plane, unveiling the existence of nonmodal pseudoresonances. A pseudospectrum analysis further predicts that fluctuations to the system may destabilize the object when next to leading-order effects are considered, as the triggering of pseudoresonant growth can break the order expansion of black hole perturbation theory.
AB - Recent investigations of the pseudospectrum in black hole spacetimes have shown that quasinormal mode frequencies suffer from spectral instabilities. This phenomenon may severely affect gravitationalwave spectroscopy and limit precision tests of general relativity. We extend the pseudospectrum analysis to horizonless exotic compact objects that possess a reflective surface arbitrarily close to the Schwarzschild radius and find that their quasinormal modes also suffer from an overall spectral instability. Even though all the modes themselves decay monotonically, the pseudospectrum contours of equal resonance magnitude around the fundamental mode and the lowest overtones can cross the real axis into the unstable regime of the complex plane, unveiling the existence of nonmodal pseudoresonances. A pseudospectrum analysis further predicts that fluctuations to the system may destabilize the object when next to leading-order effects are considered, as the triggering of pseudoresonant growth can break the order expansion of black hole perturbation theory.
KW - BLACK-HOLES
KW - STABILITY
KW - COLLAPSE
KW - MODES
U2 - 10.1103/PhysRevD.107.064012
DO - 10.1103/PhysRevD.107.064012
M3 - Journal article
VL - 107
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 6
M1 - 064012
ER -
ID: 344253943