Search Publications
Acceleration of solar wind ions to 1 MeV by electromagnetic structures upstream of the Earth's bow shock
Yamauchi, M.; Stasiewicz, K.; Markidis, S. +2 more
We present measurements from the ESA/NASA Cluster mission that show in situ acceleration of ions to energies of 1 MeV outside the bow shock. The observed heating can be associated with the presence of electromagnetic structures with strong spatial gradients of the electric field that lead to ion gyro-phase breaking and to the onset of chaos in ion…
Implications of the Planck bispectrum constraints for the primordial trispectrum
Byrnes, Christian T.; Nurmi, Sami; Tasinato, Gianmassimo +1 more
The new Planck constraints on the local bispectrum parameter f_NL are about 105 times tighter than the current constraints on the trispectrum parameter g_NL , which means that the allowed numerical values of the second-and third-order terms in the perturbative expansion of the curvature perturbation are comparable. We show that a conseq…