Detecting Rotational Superradiance in Fluid Laboratories
Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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Detecting Rotational Superradiance in Fluid Laboratories. / Cardoso, Vitor; Coutant, Antonin; Richartz, Mauricio; Weinfurtner, Silke.
I: Physical Review Letters, Bind 117, Nr. 27, 271101, 29.12.2016.Publikation: Bidrag til tidsskrift › Letter › Forskning › fagfællebedømt
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TY - JOUR
T1 - Detecting Rotational Superradiance in Fluid Laboratories
AU - Cardoso, Vitor
AU - Coutant, Antonin
AU - Richartz, Mauricio
AU - Weinfurtner, Silke
PY - 2016/12/29
Y1 - 2016/12/29
N2 - Rotational superradiance was predicted theoretically decades ago, and is chiefly responsible for a number of important effects and phenomenology in black-hole physics. However, rotational superradiance has never been observed experimentally. Here, with the aim of probing superradiance in the lab, we investigate the behavior of sound and surface waves in fluids resting in a circular basin at the center of which a rotating cylinder is placed. We show that with a suitable choice for the material of the cylinder, surface and sound waves are amplified. Two types of instabilities are studied: one sets in whenever superradiant modes are confined near the rotating cylinder and the other, which does not rely on confinement, corresponds to a local excitation of the cylinder. Our findings are experimentally testable in existing fluid laboratories and, hence, offer experimental exploration and comparison of dynamical instabilities arising from rapidly rotating boundary layers in astrophysical as well as in fluid dynamical systems.
AB - Rotational superradiance was predicted theoretically decades ago, and is chiefly responsible for a number of important effects and phenomenology in black-hole physics. However, rotational superradiance has never been observed experimentally. Here, with the aim of probing superradiance in the lab, we investigate the behavior of sound and surface waves in fluids resting in a circular basin at the center of which a rotating cylinder is placed. We show that with a suitable choice for the material of the cylinder, surface and sound waves are amplified. Two types of instabilities are studied: one sets in whenever superradiant modes are confined near the rotating cylinder and the other, which does not rely on confinement, corresponds to a local excitation of the cylinder. Our findings are experimentally testable in existing fluid laboratories and, hence, offer experimental exploration and comparison of dynamical instabilities arising from rapidly rotating boundary layers in astrophysical as well as in fluid dynamical systems.
KW - GRAVITY-WAVES
KW - BLACK-HOLE
KW - AMPLIFICATION
KW - REFLECTION
KW - STABILITY
U2 - 10.1103/PhysRevLett.117.271101
DO - 10.1103/PhysRevLett.117.271101
M3 - Letter
VL - 117
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 27
M1 - 271101
ER -
ID: 299819236