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Electrical waves circulating around an obstacle in cardiac tissue are subject to a generic oscillatory instability. In a one-dimensional ring geometry this instability can produce both quasiperiodic and spatiotemporally chaotic oscillations while in a two-dimensional sheet of cardiac tissue it can lead to spiral wave breakup. We present a control scheme to prevent this instability in these two ...

Abstract The functional renormalization group treatment of the conform reduced Einstein–Hilbert gravity is extended by following evolution time and space derivatives separately, in order to consider Lorentz symmetry during evolution. We found Reuter fixed point ultraviolet region. It shown that starting from Gaussian breaks down vicinity point. Similarly, broken phase it also infrared region cl...