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Observation of negative-frequency waves in a water tank: a classical analogue to the Hawking effect?

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Title: Observation of negative-frequency waves in a water tank: a classical analogue to the Hawking effect?
Authors: Rousseaux, Germain1,2, Mathis, Christian2, Maïssa, Philippe2, Philbin, Thomas G.3,4, Leonhardt, Ulf3 ulf@st-andrews.ac.uk
Source: New Journal of Physics. May2008, Vol. 10 Issue 5, p1-12. 12p.
Subjects: Blackbody radiation, Supermassive black holes, Gravitational collapse, Thermodynamics, Electric radiation, Quantum field theory, Physics
Abstract: The conversion of positive-frequency waves into negative-frequency waves at the event horizon is the mechanism at the heart of the Hawking radiation of black holes. In black-hole analogues, horizons are formed for waves propagating in a medium against the current when and where the flow exceeds the wave velocity. We report on the first direct observation of negative-frequency waves converted from positive-frequency waves in a moving medium. The measured degree of mode conversion is significantly higher than that expected from the theory. [ABSTRACT FROM AUTHOR]
Copyright of New Journal of Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 42323819
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  Data: <searchLink fieldCode="AR" term="%22Rousseaux%2C+Germain%22">Rousseaux, Germain</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mathis%2C+Christian%22">Mathis, Christian</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Maïssa%2C+Philippe%22">Maïssa, Philippe</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Philbin%2C+Thomas+G%2E%22">Philbin, Thomas G.</searchLink><relatesTo>3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Leonhardt%2C+Ulf%22">Leonhardt, Ulf</searchLink><relatesTo>3</relatesTo><i> ulf@st-andrews.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22New+Journal+of+Physics%22">New Journal of Physics</searchLink>. May2008, Vol. 10 Issue 5, p1-12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Blackbody+radiation%22">Blackbody radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Supermassive+black+holes%22">Supermassive black holes</searchLink><br /><searchLink fieldCode="DE" term="%22Gravitational+collapse%22">Gravitational collapse</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+radiation%22">Electric radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+field+theory%22">Quantum field theory</searchLink><br /><searchLink fieldCode="DE" term="%22Physics%22">Physics</searchLink>
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  Data: The conversion of positive-frequency waves into negative-frequency waves at the event horizon is the mechanism at the heart of the Hawking radiation of black holes. In black-hole analogues, horizons are formed for waves propagating in a medium against the current when and where the flow exceeds the wave velocity. We report on the first direct observation of negative-frequency waves converted from positive-frequency waves in a moving medium. The measured degree of mode conversion is significantly higher than that expected from the theory. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of New Journal of Physics is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1367-2630/10/5/053015
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Supermassive black holes
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      – SubjectFull: Gravitational collapse
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      – SubjectFull: Thermodynamics
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      – SubjectFull: Electric radiation
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      – SubjectFull: Quantum field theory
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      – SubjectFull: Physics
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              Text: May2008
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