Zobrazeno 1 - 10
of 725
pro vyhledávání: '"Brien C"'
Publikováno v:
In Soil Biology and Biochemistry December 2024 199
Autor:
Nolan, Brien C.
Publikováno v:
Phys. Rev. D 104, 064041 (2021)
We consider the motion of a gyroscope on a closed timelike curve (CTC). A gyroscope is identified with a unit-length spacelike vector - a spin-vector - orthogonal to the tangent to the CTC, and satisfying the equations of Fermi-Walker transport along
Externí odkaz:
http://arxiv.org/abs/2106.12469
Autor:
Nolan, Brien C.
We revisit the issue of causality violations in G\"{o}del's universe, restricting to geodesic motions. It is well-known that while there are closed timelike curves in this spacetime, there are no closed causal geodesics. We show further that no obser
Externí odkaz:
http://arxiv.org/abs/1911.08602
Publikováno v:
Phys. Rev. D 100, 104037 (2019)
The retarded Green function for linear field perturbations of black hole spacetimes is notoriously difficult to calculate. One of the difficulties is due to a Dirac-$\delta$ divergence that the Green function possesses when the two spacetime points a
Externí odkaz:
http://arxiv.org/abs/1910.02567
In this work we study the problem of first order perturbations of a general hypersurface, i.e. with arbitrary causal character at each point. We extend the framework by Mars (Class. Quantum Grav. 22 3325 (2005)) where this problem was studied to seco
Externí odkaz:
http://arxiv.org/abs/1812.11603
Autor:
Nolan, Brien C.
McVittie spacetimes embed the vacuum Schwarzschild(-(anti) de Sitter) spacetime in an isotropic FLRW background universe. We study the global structure of McVittie spacetimes with spatially non-flat FLRW backgrounds. This requires the extension of th
Externí odkaz:
http://arxiv.org/abs/1707.07612
Publikováno v:
In Gynécologie Obstétrique Fertilité & Sénologie June 2021 49(6):517-521
Autor:
Casals, Marc, Nolan, Brien C.
Publikováno v:
Phys. Rev. D 92, 104030 (2015)
The Schwarzschild exterior space-time is conformally related to a direct product space-time, $\mathcal{M}_2 \times S_2$, where $\mathcal{M}_2$ is a two-dimensional space-time. This direct product structure arises naturally when considering the wave e
Externí odkaz:
http://arxiv.org/abs/1509.03911
Autor:
Nolan, Brien C., Winstanley, Elizabeth
We investigate the stability of four-dimensional dyonic soliton and black hole solutions of ${\mathfrak {su}}(2)$ Einstein-Yang-Mills theory in anti-de Sitter space. We prove that, in a neighbourhood of the embedded trivial (Schwarzschild-)anti-de Si
Externí odkaz:
http://arxiv.org/abs/1507.08915
Autor:
Nolan, Brien C.
McVittie spacetimes represent an embedding of the Schwarzschild field in isotropic cosmological backgrounds. Depending on the scale factor of the background, the resulting spacetime may contain black and white hole horizons, as well as other interest
Externí odkaz:
http://arxiv.org/abs/1408.0044