# Computational tools for Breakthrough Propulsion Physics: State of the art and future prospects

## Related Articles

- Cosmic no-hair conjecture in scalar--tensor theories. Singh, T.; Chaubey, R. // Pramana: Journal of Physics;Dec2006, Vol. 67 Issue 6, p1037
We have shown that, within the context of scalar-tensor theories, the anisotropic Bianchi-type cosmological models evolve towards de Sitter Universe. A similar result holds in the case of cosmology in Lyra manifold. Thus the analogue of cosmic no-hair theorem of Wald [1] hold in both the cases....

- One Loop Superstring Effective Actions and d = 4 Supergravity. Moura, Filipe // AIP Conference Proceedings;7/1/2008, Vol. 1023 Issue 1, p192
We review our recent work on the existence of a new independent R4 term, at one loop, in the type IIA and heterotic effective actions, after reduction to four dimensions, besides the usual square of the Bel-Robinson tensor. We discuss its supersymmetrization.

- Debever-Penrose Principal Directions in Terms of Null Canonical Vectors. Hamdan, N.; García-Olivo, R.; López-Bonilla, J. // Electronic Journal of Theoretical Physics;Jul2007, Vol. 4 Issue 15, p101
We show explicit expressions to construct the Debever-Penrose vectors from a given null canonical tetrad.

- The holes are defined by the string. Witten, Edward // Nature;9/19/1996, Vol. 383 Issue 6597, p215
Discusses the potential for string theory to combine the seemingly incompatible theories of quantum mechanics and general relativity. The specific problem of black holes; The theories of Albert Einstein; The work of Stephen Hawking; The second superstring revolution; The states of D-branes.

- The foliation operator in history quantum field theory. Isham, C. J.; Savvidou, K. // Journal of Mathematical Physics;Nov2002, Vol. 43 Issue 11, p5493
As a preliminary to discussing the quantization of the foliation in a history form of general relativity, we show how the discussion in an earlier work [J. Math. Phys. 43, 3053 (2002)] of a history version of free, scalar quantum field theory can be augmented in such a way as to include the...

- The century of the incomplete revolution: Searching for general relativistic quantum field theory. Rovelli, Carlo // Journal of Mathematical Physics;Jun2000, Vol. 41 Issue 6
In fundamental physics, this has been the century of quantum mechanics and general relativity. It has also been the century of the long search for a conceptual framework capable of embracing the astonishing features of the world that have been revealed by these two "first pieces of a conceptual...

- Solutions of the Einsteinâ€“Cartanâ€“Dirac equations with vanishing energy-momentum tensor. Dimakis, A.; Müller–Hoissen, F. // Journal of Mathematical Physics;May85, Vol. 26 Issue 5, p1040
It is shown that a frame can always be chosen with respect to which a Dirac spinor Ïˆ has a particular simple form. This result is used to investigate the existence of solutions of the Einsteinâ€“Cartanâ€“Dirac equations with vanishing energy-momentum tensor, but nonvanishing current...

- The averaged null energy condition for general quantum field theories in two dimensions. Verch, Rainer // Journal of Mathematical Physics;Jan2000, Vol. 41 Issue 1
It is shown that in any local quantum field theory in two-dimensional Minkowski space-time possessing a mass gap and an energy-momentum tensor, the averaged null energy condition is fulfilled for the set of those vector states which correspond to energetically strongly damped, local excitations...

- On the Extension of Stringlike Localised Sectors in 2+1 Dimensions. Naaijkens, Pieter // Communications in Mathematical Physics;Apr2011, Vol. 303 Issue 2, p385
In the framework of algebraic quantum field theory, we study the category $${\Delta_{{\rm BF}}^{\mathfrak{A}}}$$ of stringlike localised representations of a net of observables $${\mathcal{O} \mapsto \mathfrak{A}(\mathcal{O})}$$ in three dimensions. It is shown that compactly localised (DHR)...