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Wave-generated 'white hole' boosts hawking radiation theory, physicists find

Date:
January 20, 2011
Source:
University of British Columbia
Summary:
A team of physicists and engineers has designed a experiment featuring a trough of flowing water to help bolster a 35-year-old theory proposed by eminent physicist Stephen Hawking.

A team of UBC physicists and engineers has designed an experiment featuring a trough of flowing water to help bolster a 35-year-old theory proposed by eminent physicist Stephen Hawking.

In 1974, Hawking predicted that black holes--often thought of having gravitational pulls so strong that nothing escapes from them--emit a very weak level of radiation. According to the theory, pairs of photons are torn apart by a black hole's gravitational field--one photon falls into the black hole, but the other escapes as a form of radiation.

In results outlined in the latest issue of Physical Review Letters, a team of UBC researchers led by international postdoctoral researcher Silke Weinfurtner put the test to Hawking's theory by creating a 'white hole' in a six-metre-long flume of flowing water.

Placing an airplane wing-shaped obstacle in the path of the flowing water created a region of high-velocity flow which blocked surface waves, generated downstream, from traveling upstream. The obstruction simulated a white hole, the temporal reverse of a black hole.

The shallow surface waves divided into pairs of deep-water waves, analogous to the photon pairs featured in Hawking's theory. Like in black holes, they showed that the analog would also emit a thermal spectrum of radiation.

"While this creative simulation obviously doesn't prove Hawking's theory, it does show that his ideas apply broadly," says UBC theoretical physicist William Unruh, part of the team which included European Union Marie Curie Fellow Weinfurtner, undergraduate student Matthew Penrice, Civil Engineering post doctoral fellow Edmund Tedford, and Canada Research Chair in Environmental Fluid Mechanics Gregory Lawrence.

"This experiment also exemplifies all of the strengths of UBC's research enterprise--the involvement of students, our international outreach and connections, and a very open, collaborative way of looking at scientific questions," says Unruh.


Story Source:

The above story is based on materials provided by University of British Columbia. Note: Materials may be edited for content and length.


Journal Reference:

  1. Silke Weinfurtner, Edmund Tedford, Matthew Penrice, William Unruh, Gregory Lawrence. Measurement of Stimulated Hawking Emission in an Analogue System. Physical Review Letters, 2011; 106 (2) DOI: 10.1103/PhysRevLett.106.021302

Cite This Page:

University of British Columbia. "Wave-generated 'white hole' boosts hawking radiation theory, physicists find." ScienceDaily. ScienceDaily, 20 January 2011. <www.sciencedaily.com/releases/2011/01/110118101519.htm>.
University of British Columbia. (2011, January 20). Wave-generated 'white hole' boosts hawking radiation theory, physicists find. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2011/01/110118101519.htm
University of British Columbia. "Wave-generated 'white hole' boosts hawking radiation theory, physicists find." ScienceDaily. www.sciencedaily.com/releases/2011/01/110118101519.htm (accessed April 18, 2014).

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