Radiation force

These notes were inspired by discussions at the 2024 Physical Acoustics Summer School.

1. Radiation force of pendulum
• By the virial theorem
• By adiabatic invariance
2. Radiation force of a string
• As a consequence of linear equations of motion
• As a consequence of nonlinear equations of motion
3. Radiation force of light (under construction)
4. Radiation force of sound
• Energy densities
• Acoustic Poynting theorem (energy conservation)
• Acoustic radiation stress tensor
• Mean excess pressure
• Acoustic radiation force
• Due to traveling waves
• Due to standing waves (under construction)
• Is radiation force a linear or nonlinear effect?
• Arguments as to why radiation force is a nonlinear effect
• Arguments as to why radiation force is a linear effect
5. Useful identities
6. References

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