On the right, an artificial atom generates sound waves consisting of ripples on the surface of a solid. The sound, known as a surface acoustic wave (SAW) is picked up on the left by a “microphone” composed of interlaced metal fingers. According to theory, the sound consists of a stream of quantum particles, the weakest whisper physically possible. The illustration is not to scale. (Credit: Philip Krantz, Krantz NanoArt)
via chalmers
Close-ups of an experiment conducted by John Bush and his student Daniel Harris, in which a bouncing droplet of fluid was propelled across a fluid bath by waves it generated. (Credit: Dan Harris)
via phys
The Smoluchowsi trapdoor is a simple test for any proposed exorcism of Maxwell’s demon. It is immediately obvious that an information based exorcism is of no use. The are no sensors in this simple device that collect information; and there are memory devices that would need erasure if the demon is to return to its original state. (Credit: Hemmo, M.; Shenker)
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Gravity Probe B (GP-B) has measured spacetime curvature near Earth to test related models in application of Einstein’s general theory of relativity. (Credit: S. Hossenfelder, Wiki Commons)
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The research group resolved the challenging issue attributed to solid crystals, namely widely spread emission wavelengths, and succeeded in fabricating many single-photon sources that emit photons with nearly identical emission wavelengths. (Credit: National Institute for Materials Science (NIMS))
via innovations-report
C H Figure 1: Acausality: Penrose diagram of a black hole with signature c hange at high curvature (hashed region). In contrast to traditional non-sing ular models, there is an event horizon (dashed line H , the boundary of the region that is determined by backward evolution from future infinity) and a Chauchy horizon (dash-dotte d line C , the boundary of the region obtained by forward evolution of the high-curvature re gion) (Credit: Martin Bojowald)
via arXiv
Giant alien planets known as “hot Jupiters” can induce wobbles in their parent stars that may lead to the wild, close orbits seen by astronomers. This diagram shows the relationship between wobbling stars and the orbital tilt of hot Jupiter planets. (Credit: Cornell University/N.Storch, K.Anderson, D.Lai)
via space
