scholarly journals Sound modes and stability of momentum dissipated black branes in holography

2019 ◽  
Vol 99 (10) ◽  
Author(s):  
Wenhe Cai ◽  
Xian-Hui Ge ◽  
QingBing Wang
Keyword(s):  
Sound Modes

scholarly journals Non-equilibrium effective field theory and second sound

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Michael J. Landry
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Sound Wave ◽  
Effective Field ◽  
Second Sound ◽  
Gauge Symmetries ◽  
Sound Modes ◽  
State Of Matter ◽  
The Difference ◽  
Non Equilibrium

Abstract We investigate the phenomenon of second sound in various states of matter from the perspective of non-equilibrium effective field theory (EFT). In particular, for each state of matter considered, we find that at least two (though sometimes multiple) qualitatively different EFTs exist at finite temperature such that there is always at least one EFT with a propagating second-sound wave and at least one with no such second-sound wave. To aid in the construction of these EFTs, we use the method of cosets developed for non-equilibrium systems. It turns out that the difference between the EFTs with and without second-sound modes can be understood as arising from different choices of a new kind of inverse Higgs constraint. Finally, we demonstrate that it is possible to bypass the need for new inverse Higgs constraints by formulating EFTs on a new kind of manifold that is like the usual fluid worldvolume, but with reduced gauge symmetries.

scholarly journals Damping Off Terahertz Sound Modes of a Liquid upon Immersion of Nanoparticles

ACS Nano ◽  
2018 ◽  
Vol 12 (9) ◽  
pp. 8867-8874 ◽  
Author(s):  
Alessio De Francesco ◽  
Luisa Scaccia ◽  
Marco Maccarini ◽  
Ferdinando Formisano ◽  
Yugang Zhang ◽  
...  
Keyword(s):  
Damping Off ◽  
Sound Modes

Three Sound Modes in a Bose–Fermi Superfluid Mixture at Finite Temperatures

2019 ◽  
Vol 88 (3) ◽  
pp. 034003
Author(s):  
Yosuke Ono ◽  
Rei Hatsuda ◽  
Kenta Shiina ◽  
Hiroyuki Mori ◽  
Emiko Arahata
Keyword(s):  
Fermi Superfluid ◽  
Sound Modes

NOVEL SOUND PHENOMENA IN IMPURE SUPERFLUIDS

2006 ◽  
Vol 20 (03) ◽  
pp. 355-380
Author(s):  
PETER BRUSOV ◽  
PAVEL BRUSOV
Keyword(s):  
Superfluid Helium ◽  
Acoustic Features ◽  
New Techniques ◽  
New Class ◽  
First Sound ◽  
Sound Modes ◽  
Temperature Waves ◽  
Temperature And Pressure ◽  
First Time ◽  
Cerenkov Emission

In the last decade, new techniques for producing impure superfluids with unique properties have been developed. This new class of systems includes superfluid helium confined to aerogel, HeII with different impurities, superfluids in Vycor glasses, and watergel. These systems exhibit very unusual properties including unexpected acoustic features. We discuss the sound properties of these systems and show that sound phenomena in impure superfluids are modified from those in pure superfluids. We calculate the coupling between temperature and pressure oscillations for impure superfluids and show that this coupling increases significantly. This leads to the existence in impure superfluids of such unusual sound phenomena as slow "pressure" waves and fast "temperature" waves. This also decreases the threshold values for nonlinear processes as compared to pure superfluids. Sound conversion, which has been observed in pure superfluids only by high intensity waves should be observed at moderate sound amplitude in impure superfluids. Cerenkov emission of second sound by first sound (which has never been observed in superfluids) could be observed in impure superfluids. Even the nature of the sound modes in impure superfluids turns out to be changed. We have also derived for the first time the nonlinear hydrodynamic equations for superfluid helium in aerogel.

Heavily damped sound modes in dense krypton gas studied by neutron Brillouin scattering

1997 ◽  
Vol 234-236 ◽  
pp. 311-312 ◽  
Author(s):  
U. Bafile ◽  
C. Benmore ◽  
P.A. Egelstaff ◽  
B. Mos ◽  
J.-B. Suck ◽  
...  
Keyword(s):  
Brillouin Scattering ◽  
Sound Modes

Short-Wavelength Sound Modes in Liquid Argon

1983 ◽  
Vol 50 (13) ◽  
pp. 974-977 ◽  
Author(s):  
I. M. de Schepper ◽  
P. Verkerk ◽  
A. A. van Well ◽  
L. A. de Graaf
Keyword(s):  
Short Wavelength ◽  
Liquid Argon ◽  
Sound Modes
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