We study disk galaxies in the framework of general relativity to focus on possibility that, even low energy limit, there are relevant corrections with respect purely Newtonian approach. Our analysis encompasses model by considering both a expansion and exact solutions, making clear connection between these different approaches. In particular, we two limits: well-known gravitomagnetic analogy ne...

A cross-polarization method has been used to eliminate the specular reflection and enhance the diffusive backscattering of fluorescence excitation light from tissue-like phantoms and skin tissue. We have demonstrated that the non-uniformity of excitation and collection of a fluorescence imaging system can be corrected by normalizing fluorescence signal to the cross-polarized reflection signal r...

Considering the geometry of the hollow-cone model of radio pulsar emission in detail, one is led to the conclusion that severalwell-knownobserved effectsmay be explained quite easily purely on geometrical terms. It can be shown e.g. that the appearance of outriders at high frequencies and a steepening of the whole spectrum (cut-off) must be expected for certain geometrical situations as well as...

The motion of a domain wall in a two-dimensional medium is studied by taking into account the internal elastic degrees of freedom of the wall and geometrical pinning produced by both holes and sample boundaries. This study is used to analyze the geometrical conditions needed for optimizing crossed-ratchet effects in periodic rectangular arrays of asymmetric holes, recently observed experimental...

We explore various design principles for efficient excitation energy transport in complex quantum systems. We investigate energy transfer efficiency in randomly disordered geometries consisting of up to 20 chromophores to explore spatial and spectral properties of small natural/artificial Light-Harvesting Complexes (LHC). We find significant statistical correlations among highly efficient rando...

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We discuss effects of fluctuation geometry on primordial nucleosynthesis. For the first time we consider condensed cylinder and cylindrical-shell fluctuation geometries in addition to condensed spheres and spherical shells. We find that a cylindrical shell geometry allows for an appreciably higher baryonic contribution to be the closure density (Ωbh 2 50 < ∼ 0.2) than that allowed in spherical ...

The lateral Casimir-Polder force between an atom and a corrugated surface should allow one to study experimentally nontrivial geometrical effects in the electromagnetic quantum vacuum. Here, we derive the theoretical expression of this force in the scattering approach. We show that large corrections to the "proximity force approximation" could be measured using present-day technology with a Bos...

Excitons confined to flat semiconductor quantum dots with elliptical cross section are considered as we study geometrical effects on exciton binding energy, electron-hole separation, and the resulting linear optical properties. We use numerical matrix diagonalization techniques with appropriately large and optimized basis sets in an effective-mass Hamiltonian approach. The linear optical suscep...