Abstract
If we live on the weak brane with zero effective cosmological constant in a warped 5D bulk spacetime, gravitational waves and brane fluctuations can be generated by a part of the 5D Weyl tensor and carries information of the gravitational field outside the brane. We consider on a cylindrical symmetric warped FLRW background a U(1) self-gravitating scalar field coupled to a gauge field without bulk matter. It turns out that brane fluctuations can be formed dynamically, due to the modified energy–momentum tensor components of the scalar-gauge field (“cosmic string”). As a result, we find that the late-time behavior could significantly deviate from the standard evolution of the universe. The effect is triggered by the time-dependent warpfactor with two branches of the form \(\frac{\pm 1}{\sqrt{\tau r}}\sqrt{(c_1e^{\sqrt{2\tau } t}+c_2e^{-\sqrt{2\tau } t})(c_3e^{\sqrt{2\tau } r}+c_4e^{-\sqrt{2\tau } r})}\) ( with \(\tau , c_i\) constants) and the modified brane equations comparable with a dark energy effect. This is a brane-world mechanism, not present in standard 4D FLRW, where the large disturbances are rapidly damped as the expansion proceed. Because gravity can propagate in the bulk, the cosmic string can build up a huge angle deficit (or mass per unit length) by the warpfactor and can induce massive KK-modes felt on the brane. Disturbances in the spatial components of the stress-energy tensor cause cylindrical symmetric waves, amplified due to the presence of the bulk space and warpfactor. They could survive the natural damping due to the expansion of the universe. It turns out that one of the metric components becomes singular at the moment the warp factor develops an extremum. This behavior could have influence on the possibility of a transition from acceleration to deceleration or vice versa.
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Slagter, R.J., Pan, S. A New Fate of a Warped 5D FLRW Model with a U(1) Scalar Gauge Field. Found Phys 46, 1075–1089 (2016). https://doi.org/10.1007/s10701-016-0002-2
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DOI: https://doi.org/10.1007/s10701-016-0002-2