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Kinetic Turbulence in Astrophysical Plasmas: Waves and/or Structures?
Chen, Christopher H. K.; Grošelj, Daniel; Mallet, Alfred +3 more
The question of the relative importance of coherent structures and waves has for a long time attracted a great deal of interest in astrophysical plasma turbulence research, with a more recent focus on kinetic scale dynamics. Here we utilize high-resolution observational and simulation data to investigate the nature of waves and structures emerging…
Gravitational-Wave Cosmology across 29 Decades in Frequency
Shannon, Ryan M.; Mingarelli, Chiara M. F.; Kerr, Matthew +24 more
Quantum fluctuations of the gravitational field in the early Universe, amplified by inflation, produce a primordial gravitational-wave background across a broad frequency band. We derive constraints on the spectrum of this gravitational radiation, and hence on theories of the early Universe, by combining experiments that cover 29 orders of magnitu…