Bubbly without gravity

Parallel LBM to Simulate Gravity Driven Bubbly and Slug Flows

Multi phase and multi component flows are ubiquitous in nature as well as in many man-made processes. Multi-phase flows typically manifest a wide variety of geometrical patterns (or flow regimes) of associated phases depending on several system conditions. These patterns include, but are not limited to, bubbly, slug, churn or annular flows. In the case of boiling this may lead to Departure from...

Turbulent bubbly flow in pipe under gravity and microgravity conditions

Quantum Gravity Without Ghosts

An outline is given of a recently discovered technique for building a quantum e ective action that is completely independent of gaugexing choices and ghost determinants. One makes maximum use of the geometry and brebundle structure of the space of eld histories and introduces a set of nonlocal composite elds: the geodesic normal elds based on Vilkovisky's connection on the space of histories. T...

Quantum Gravity without General Relativity

The quantum field theory of gravitation is constructed in terms of Lagrangian density of Dirac fields which couple to the electromagnetic field Aμ as well as the gravitational field G. The gravity appears in the mass term as m(1+gG)ψ̄ψ with the coupling constant of g. In addition to the gravitational force between fermions, the electromagnetic field Aμ interacts with the gravity as the fourth or...

Quantum gravity without Lorentz invariance

There has been a significant surge of interest in Horava’s model for 3+1 dimensional quantum gravity, this model being based on anisotropic scaling at a z = 3 Lifshitz point. Horava’s model, and its variants, show dramatically improved ultra-violet behaviour at the cost of exhibiting violation of Lorentz invariance at ultra-high momenta. Following up on our earlier note, arXiv:0904.4464 [hep-th...