Zobrazeno 1 - 10
of 193
pro vyhledávání: '"Stelle, K. S."'
Autor:
Lehners, Jean-Luc, Stelle, K. S.
General relativity allows for inhomogeneous and anisotropic universes with finite action. By contrast, in quadratic gravity such solutions obtain infinite action and are thus eliminated. What remains are homogeneous and isotropic solutions undergoing
Externí odkaz:
http://arxiv.org/abs/2312.14048
Autor:
Leung, Rahim, Stelle, K. S.
Deriving an effective massless field theory for fluctuations about a braneworld spacetime requires analysis of the transverse-space-wavefunction's second-order differential equation. There can be two strikingly different types of effective theory. Fo
Externí odkaz:
http://arxiv.org/abs/2311.04209
String compactifications typically require fluxes, for example in order to stabilise moduli. Such fluxes, when they thread internal dimensions, are topological in nature and take on quantised values. This poses the puzzle as to how they could arise i
Externí odkaz:
http://arxiv.org/abs/2209.08960
Autor:
Leung, Rahim, Stelle, K. S.
Supergravity brane solutions allow for a generalised type of Kaluza-Klein reduction onto brane worldvolumes. The known replacement of a flat worldvolume metric by a Ricci-flat metric constitutes a consistent Kaluza-Klein truncation of the starting hi
Externí odkaz:
http://arxiv.org/abs/2205.13551
Reduction in effective spacetime dimensionality can occur in field-theory models more general than the widely studied dimensional reductions based on technically consistent truncations. Situations where wavefunction factors depend nontrivially on coo
Externí odkaz:
http://arxiv.org/abs/2202.00017
Generating an effective theory of lower-dimensional gravity on a submanifold within an original higher-dimensional theory can be achieved even if the reduction space is non-compact. Localisation of gravity on such a lower-dimensional worldvolume can
Externí odkaz:
http://arxiv.org/abs/2110.10688
Autor:
Duff, M. J., Stelle, K. S.
Publikováno v:
Biogr. Mems Fell. R. Soc. 70, 225-244 (2021)
Professor Tom Kibble was an internationally-renowned theoretical physicist whose contributions to theoretical physics range from the theory of elementary particles to modern early-universe cosmology. The unifying theme behind all his work is the theo
Externí odkaz:
http://arxiv.org/abs/2011.13257
Reduction from a higher-dimensional to a lower-dimensional field theory can display special features when the zero-level ground state has nontrivial dependence on the reduction coordinates. In particular, a delayed `covert' form of spontaneous symmet
Externí odkaz:
http://arxiv.org/abs/2007.12192
Autor:
Stelle, K. S.
Remembering the foundational contributions of Peter Freund to supergravity, and especially to the problems of dimensional compactification, reduction is considered with a non-compact space transverse to the lower dimensional theory. The known problem
Externí odkaz:
http://arxiv.org/abs/2004.00965
Autor:
Lehners, Jean-Luc, Stelle, K. S.
Publikováno v:
Phys. Rev. D 100, 083540 (2019)
When general relativity is augmented by quadratic gravity terms, it becomes a renormalisable theory of gravity. This theory may admit a non-Gaussian fixed point as envisaged in the asymptotic safety program, rendering the theory trustworthy to energi
Externí odkaz:
http://arxiv.org/abs/1909.01169