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Area of Science:

  • Astrophysics
  • Experimental Physics
  • Acoustics

Background:

  • Astrophysical black holes are open systems radiating quasinormal modes (QNMs) to infinity.
  • Laboratory analogs of black holes are finite-sized, posing challenges for experimental QNM excitation.

Purpose of the Study:

  • To investigate how enclosing a toy black hole model with a partially reflecting wall influences its QNM spectrum.
  • To establish a connection between the QNM spectra of open and finite-sized systems.
  • To explore the excitation of QNMs in laboratory settings with unavoidable noise and finite-size effects.

Main Methods:

  • A toy-model black hole system was simulated.
  • The effect of a partially reflecting wall with adjustable reflectivity on the QNM spectrum was analyzed.
  • The excitation of QNMs by incoherent background noise was demonstrated.

Main Results:

  • A continuous connection was found between the QNM spectra of open and finite-sized systems.
  • QNMs in the enclosed system were shown to be easily excited by background noise.
  • The study provides a framework for understanding QNMs in realistic laboratory conditions.

Conclusions:

  • Enclosing a system with a partially reflecting wall allows for the study of QNMs in finite-sized analogs.
  • Incoherent background noise can effectively excite QNMs, suggesting experimental feasibility.
  • This work paves the way for laboratory studies of black hole quasinormal modes and compact objects.