We consider the problem of a scalar field, non-minimally coupled to gravity through a −ξφ 2 R term, in the presence of a Brane. Exact solutions, for a wide range of values of the coupling parameter ξ, for both φ-dependent and φ-independent Brane tension, are derived and their behaviour is studied. In the case of a Randall-Sundrum geometry, a class of the resulting scalar field solutions exhibits a folded-kink profile. We go beyond the Randall-Sundrum geometry studying general warp factor solutions in the presence of a kink scalar. Analytic and numerical results are provided for the case of a Brane or for smooth geometries, where the scalar field acts as a thick Brane. It is shown that finite geometries with warp factors that asymptotically decrease exponentially are realizable for a wide range of parameter values. We also study graviton localization in our setup and find that the localizing potential for gravitons with the characteristic volcano-like profile develops a local maximum located at the origin for high values of the coupling ξ.
We consider the possibility of getting accelerated expansion and w = −1 crossing in the context of a braneworld cosmological setup, endowed with a bulk energy-momentum tensor. For a given ansatz of the bulk content, we demonstrate that the bulk pressures dominate the dynamics at late times and can lead to accelerated expansion. We also analyze the constraints under which we can get a realistic profile for the effective equation of state and conclude that matter in the bulk has the effect of dark energy on the brane. Furthermore, we show that it is possible to simulate the behavior of a Chaplygin gas using non-exotic bulk matter.
We consider the cosmological evolution of a brane in the presence of a bulk scalar field coupled to the Ricci scalar through a term f (φ)R. We derive the generalized Friedmann equation on the brane in the presence of arbitrary brane and bulk-matter, as well as the scalar field equation, allowing for a general scalar potential V (φ). We focus on a quadratic form of the above non-minimal coupling −ξφ 2 R and obtain a class of late-time solutions for the scale factor and the scalar field on the brane that exhibit accelerated expansion for a range of the non-minimal coupling parameter ξ.
BACKGROUND AND PURPOSE:EPFs sustained during VCFs degrade the disk's ability to develop IDP under load. This inability to develop pressure in combination with residual kyphotic deformity increases the risk for adjacent vertebral fractures. We tested the hypothesis that StaXx FX reduces kyphosis and endplate deformity following vertebral compression fracture, restoring disk mechanics.
We consider 5D braneworld models of quasi-localized gravity in which 4D gravity is reproduced at intermediate scales while the extra dimension opens up at both the very short and the very long distances, where the geometry is flat. Our main interest is the interplay between the zero mode of these models, whenever a normalizable zero mode exists, and the effects of zero energy graviton resonant modes coming from the contributions of massive KK modes. We first consider a compactified version of the GRS model and find that quasi-localized gravity is characterized by a scale for which both the resonance and the zero mode have significant contribution to 4D gravity. Above this scale, gravity is primarily mediated by the zero mode, while the resonance gives only minor corrections. Next, we consider an asymmetric version of the standard non-compact GRS model, characterized by different cosmological constants on each AdS side. We show that a resonance is present but the asymmetry, through the form of the localizing potential, can weaken it, resulting in a shorter lifetime and, thus, in a shorter distance scale for 4D gravity. As a third model exhibiting quasi-localization, we consider a version of the GRS model in which the central positive tension brane has been replaced by a configuration of a scalar field propagating in the bulk.
intravenous heparin drip. Two of the postprocedural non-neurological complications required postprocedural ICU intervention, with both patients sustaining pulmonary edema remaining intubated until dialysis was performed. The remainder of these complications required only routine medical management. The retroperitoneal hematomas, both which were small and discovered due to complaints of right flank pain, did not result in hemodynamic instability or blood transfusion. Conclusion: The results of this study demonstrate low technical and clinical complication rates from elective endovascular treatment of unruptured intracranial aneurysms. In this study, all patients necessitating postprocedural ICU care were identified in the periprocedural or immediate postprocedural recovery period. These findings support the concept that uncomplicated elective endovascular unruptured intracranial aneurysm treatments do not routinely need postprocedural ICU care and can be safely managed in a stepdown unit.
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