A homogeneous model of spinfoam cosmology

Supersymmetric homogeneous Quantum Cosmology

Canonical N = 1, D = 4 quantum supergravity is studied in a modeamplitude basis, where its supersymmetry generators are found to be represented by deformed exterior derivatives on configuration space. Cosmological models in supergravity are shown to be governed by the covariant version of the Witten model of supersymmetric quantum mechanics. Properties of the latter are investigated and the res...

Homogeneous Loop Quantum Cosmology

Loop quantum cosmological methods are extended to homogeneous models in diagonalized form. It is shown that the diagonalization leads to a simplification of the volume operator such that its spectrum can be determined explicitly. This allows the calculation of composite operators, most importantly the Hamiltonian constraint. As an application the dynamics of the Bianchi I model is studied and i...

investigating the feasibility of a proposed model for geometric design of deployable arch structures

deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...

Hamiltonian spinfoam gravity

Oscillatory Behaviour in Homogeneous String Cosmology Models

Some spatially homogeneous Bianchi type I cosmological models filled with homogeneous “electric” p-form fields are shown to mimic the never-ending oscillatory behaviour of generic string cosmologies established recently. The validity of the “Kasner-free-flights plus collisions-on-potential-walls” picture is also illustrated in the case of known, non-chaotic, superstring solutions.