One-way Mirror for Sound Waves
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25 August 2009
A proposed structure blocks sound waves in one direction but lets them pass in the other direction by first doubling their frequency.  PRL (4 September 2009)
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A Quantum Arrow of Time
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17 August 2009
Real-world events always proceed in the direction of increasing entropy, even though the laws of physics don't require it. The reason we never see events that reduce entropy is that they cannot leave behind any evidence of having happened, according to a new theory. PRL (21 August 2009)
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Nuclei Cooperate to Produce Single Particle
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7 August 2009
Ultrahigh energy photons striking matter can transform into rho mesons through an interaction that involves many nuclei simultaneously, a phenomenon that may affect the detection signatures of high-energy particles from space. PRL (7 August 2009)
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Click on to see the research paper described in the story.
