Spectral signatures of ultra-rapidly varying objects in spectroscopic surveys

Spectral Signatures of Photon - Particle Oscillations from Celestial Objects

We give detailed predictions for the spectral signatures arising from photon-particle oscillations in astrophysical objects. The calculations include quantum electrodynamic effects as well as those due to active relativistic plasma. We show that, by studying the spectra of compact sources, it may be possible to directly detect (pseudo)scalar particles, such as the axion, with much greater sensi...

Rapidly-Varying Speed of Sound, Scale Invariance and Non-Gaussian Signatures

We show that curvature perturbations acquire a scale invariant spectrum for any constant equation of state, provided the fluid has a suitably time-dependent sound speed. In order for modes to exit the physical horizon, and in order to solve the usual problems of standard big bang cosmology, we argue that the only allowed possibilities are inflationary (albeit not necessarily slow-roll) expansio...

Spectroscopic method rapidly identifies proteins

In the last four decades, human fertility has declined across the globe, a trend that policy experts predict will continue. As a result, international migration will increasingly affect the demographic future of many nations. Joel Cohen et al. devised a generalized linear model to predict the yearly number of regional and international migrants. The model includes projected demographic variable...

Quasistellar Objects: Surveys

Diffusion on Rapidly Varying Surfaces

Lateral diffusion of particles along interfaces is a frequently occurring phenomenon in cellular biology. The mobility of membrane proteins has far-reaching implications for many cellular processes, in particular protein transport, signalling and morphology, thus there has been considerable interest in measuring how the mobility of these proteins is affected by the membrane and its surrounding ...