| 1 | Theoretically multi-wave exploration is certainly superior to pure P-wave exploration. | |
| 2 | And the phase velocity of fast wave will decrease exponentially with frequency. | |
| 3 | Mechanical disturbance that propagates as a longitudinal wave through a solid, liquid, or gas. A sound wave is generated by a vibrating object. | |
| 4 | Sound: Mechanical disturbance that propagates as a longitudinal wave through a solid, liquid, or gas. A sound wave is generated by a vibrating object. | |
| 5 | The dispersion relations of superluminal waves for the longitudinal collective modes in unmagnetized, collisionless and homogeneous relativistic electron-positron plasmas are derived. |
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