Applying a simple harmonic map method to the cylindrically symmetric Einstein-Maxwell system, we obtain exact solutions representing strong nonlinear interaction between gravitational waves and electromagnetic in case without any background field. As an interesting fact, can show that with adjusted parameters solution represents occurrences of large conversion phenomena intense region fields ne...

Statistical methods are powerful for analyzing frequent events, but weak for analyzing uncommon events such as regime shifts. The rarity of regime shifts poses deep problems for both understanding and prediction. For any given regime shift, many different models are equally appropriate. There are straightforward statistical methods for sorting among rival models, but these depend on observing m...