We consider branes N in a Schwarzschild-AdS(n+2) bulk, where the stress energy tensor is dominated by the energy density of a scalar fields map φ : N → S with potential V , where S is a semiRiemannian moduli space. By transforming the field equation appropriately, we get an equivalent field equation that is smooth across the singularity r = 0, and which has smooth and uniquely determined soluti...

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...

In this paper it is investigated whether torsion, which arises naturally in most theories of quantum gravity, has observable implications for the Big Bang nucleosynthesis. Torsion can lead to spin flips amongst neutrinos thus turning them into sterile neutrinos. In the early Universe they can alter the helium abundance which is tightly constrained by observations. Here I calculate to what exten...

A fractional order PID (FOPID) control technique for automatic generation (AGC) in a multi-area power system is presented this study. To create reliable controller, variety of strategies were used. The load frequency (LFC) problem implementing different transactions, such as bilateral and Poolco are investigated here. Because any scheme’s performance only good its parameters, the parameters des...