A Model for Quantum Stochastic Absorption in Absorbing Disordered Media

Wave propagation in coherently absorbing disordered media is generally modeled by adding a complex part to the real part of the potential. In such a case, it is already understood that the complex potential plays a duel role; it acts as an absorber as well as a reflector due to the mismatch of the phase of the real and complex parts of the potential. Although this model gives expected results for weakly absorbing disordered media, it gives unphysical results for the strong absorption regime where it causes the system to behave like a perfect reflector. To overcome this issue, we develop a model here using stochastic absorption for the modeling of absorption by "fake", or "side", channels obviating the need for a complex potential. This model of stochastic absorption eliminates the reflection that is coupled with the absorption in the complex potential model and absorption is proportional to the magnitude of the absorbing parameter. Solving the statistics of the reflection coefficient and its phase for both the models, we argue that stochastic absorption is a potentially better way of modeling absorbing disordered media.Comment: 5 pages, 4 figure

South Sudan: Peace and Security Challenges

Since its independence in 2011, the South Sudanese President Salva Kiir Mayardit (Salva Kiir) has been striving for reconciliation with various ethnic, tribal, armed groups and communities in the country. As part of his efforts for the country's political stability, he has pardoned several leaders who even led rebellions against the Sudan People's Liberation Movement (SPLM) – the political organisation that brought independence for the country. In the process, the factional leaders also got incorporated into the Kiir government or his armed forces. Unfortunately, these rebel leaders brought their own armed forces with them in the political and military compositions of the country, which in turn, posed a great challenge to the government in the form of downsizing, reforming and “right-sizing” the increasingly bloated political and defense sector. In 2013, President Kiir made major changes in his government to downsize and address governance concerns because of perceived threat to his government and pressure from International donors to crack down corruption. He replaced two state governors and dismissed two senior cabinet ministers on corruption charges and conducted a major cabinet reshuffle, with removal of Vice President Riek Machar and his entire group of ministers. The President also dismissed the ruling party secretary-general Pagan Amum, who had been publicly critical of the dismissals and Rebecca Garang, the widow of the late SPLA (Sudan People's Liberation Army) leader, John Garang. DOI: 10.5281/zenodo.336698