Power system voltage security is improved by optimizing reactive power dispatch (ORPD). ORPD problem is a multi-constrained, multi-objective problem involving both continuous and discrete control variables. An efficient optimization technique is needed for handling such a challenging objective function. Generator bus voltages, transformer tap positions and shunt Var compensator settings are the...

We determine the inner product on Hilbert space of wavefunctions universe by imposing Hermiticity quantum Hamiltonian in context minisuperspace model. The corresponding probability density reproduces successfully classical distribution $\hbar \to 0$ limit, for closed universes filled with a perfect fluid index $w$. When $-1/3<w\le 1$, wavefunction is normalizable and becomes vanishingly small a...

We consider a cosmological scenario within the KKLT framework for moduli stabilization in string theory. The universal open string tachyon of decaying non-BPS D-brane configurations is proposed to drive eternal topological inflation. Flux-induced ‘warping’ can provide the small slow-roll parameters needed for successful inflation. Constraints on the parameter space leading to sufficient number ...

The AdS/CFT correspondence allows us to map a dynamical cosmology to a dual quantum field theory living on the boundary of spacetime. Specifically, we study a five-dimensional model cosmology in type IIB supergravity, where the dual theory is an unstable deformation of N = 4 supersymmetric SU(N) gauge theory on IR×S3. A one-loop computation shows that the coupling governing the instability is a...

A teoria do Big Bang corresponde ao modelo explicativo início Universo a partir de um ponto (singularidade) elevada densidade e temperatura que começa expandir- se, criando-se o espaço-tempo. Sendo seguido pelo período inflação cósmica, dominado pela radiação outro matéria (principalmente escura) até momento atual, por uma energia escura, permite explicar história nosso observável. O é bem test...