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The AB interface in superfluid He-3 as a simulated cosmological brane.

Bradley, Ian and Fisher, Shaun N. and Guénault, A.M. and Haley, Richard P. and Kopu, J. and Martin, Hazel and Pickett, George R. and Roberts, John Edward and Tsepelin, Viktor (2007) The AB interface in superfluid He-3 as a simulated cosmological brane. Journal of Low Temperature Physics, 148 (5-6). pp. 465-473. ISSN 0022-2291

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Abstract

We present measurements of the transport of superfluid He-3 quasiparticle excitations in the ballistic limit at temperatures well below T-c , and an interpretation of unexpected results as an experimental simulation of cosmological processes. Using a variable magnetic field profile we stabilize a layer of A phase across a cylinder of B phase, creating both an AB and a BA interface. These highly ordered interfaces may provide an ideal laboratory analogy for the branes and anti-branes of current cosmology. It has been suggested that brane interaction and annihilation are involved in inflation in the early Universe and leave behind topological defects such as cosmic strings. In our experiments we have annihilated our AB/BA branes by ramping down the magnetic field to remove the A phase layer. We then find that the quasiparticles face an extra impedance owing to defects left behind in the B phase texture. This is the first definitive observation of such a phenomenon.

Item Type: Article
Journal or Publication Title: Journal of Low Temperature Physics
Uncontrolled Keywords: BALLISTIC QUASI-PARTICLES ; LOW-TEMPERATURE LIMIT ; B PHASE INTERFACE ; MAGNETIC-FIELD ; TRANSITION
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23472
Deposited By: Dr Richard P. Haley
Deposited On: 23 Jan 2009 14:25
Refereed?: Yes
Published?: Published
Last Modified: 17 Jul 2013 10:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23472

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