slides - Physics and Astronomy - University of Mississippi

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Outline Sound waves in the early universe Nature of sound in a hot plasma Acoustic imprint in the microwave background Connections to dark energy and matter Acoustics and slip-stick friction A table top model fault zone The role of transient elastic waves Connections to earthquake triggering Acoustic Metamaterials Generalized wave phenomenon Coherent scattering effects: negative index of refraction, band gaps Applications: acoustic lenses, filters, cloaking THE UNIVERSITY OF MISSISSIPPI The University of Mississippi Institute for Advanced Education in Geospatial Science J.R. Gladden
Sound waves in the early universe After Inflation phase (0 – 380k yrs) Baryonic (n,p) matter was fully ionized Acoustic waves driven by radiation pressure Momentum transfer between photons and free electrons Source: small, early (quantum?) fluctuations in photon density ⇉ radiation pressure gradients ⇉ propagating sound waves. Courtesy of NASA/WMAP Science Team THE UNIVERSITY OF MISSISSIPPI The University of Mississippi Reference: Eisenstein and Bennett, Physics Today, p. 44-50,April 2008 Institute for Advanced Education in Geospatial Science J.R. Gladden
Page 1: Hot Topics in Physical Acoustics J.
Page 5 and 6: The end of the acoustic era At Rec
Page 7 and 8: Wilkinson Microwave Anisotropy Prob
Page 9 and 10: Outline Sound waves in the early u
Page 11 and 12: San Andreas Fault courtesy of USGS
Page 13 and 14: Behavior without vibration Stress
Page 15 and 16: Outline Sound waves in the early u
Page 17 and 18: Negative index of refraction Paral
Page 19 and 20: Conclusions Physical acoustics con

slides - Physics and Astronomy - University of Mississippi

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