$J$-self-adjoint operators with $\mathcal{C}$-symmetries: extension theory approach (2008)
Albeverio, S., Guenther, U., Kuzhel, S.
A well known tool in conventional (von Neumann) quantum mechanics is the self-adjoint extension technique for symmetric operators. It is used, e.g., for the construction of Dirac-Hermitian...
Graefe, E. M., Guenther, U., Korsch, H. J., Niederle, A. E.
We study a non-Hermitian $PT-$symmetric generalization of an $N$-particle, two-mode Bose-Hubbard system, modeling for example a Bose-Einstein condensate in a double well potential coupled to a...
A paradigmatic model of Earth's magnetic field reversals (2006)
Stefani, F., Gerbeth, G., Guenther, U.
The irregular polarity reversals of the Earth's magnetic field have attracted much interest during the last decades. Despite the fact that recent numerical simulations of the geodynamo have shown...
Guenther, U., Stefani, F., Gerbeth, G.
The spectral branching behavior of the 2x2 operator matrix of the magneto-hydrodynamic alpha^2-dynamo is analyzed numerically. Some qualitative aspects of level crossings are briefly discussed with...
Guenther, U., Starobinsky, A., Zhuk, A.
We investigate four-dimensional effective theories which are obtained by dimensional reduction of multidimensional cosmological models with factorizable geometry and consider the interaction between...
Guenther, U., Moniz, P., Zhuk, A.
We consider multidimensional gravitational models with a nonlinear scalar curvature term and form fields in the action functional. In our scenario it is assumed that the higher dimensional spacetime...
Multidimensional cosmology and asymptotical AdS (2002)
Guenther, U., Moniz, P., Zhuk, A.
A non-linear gravitational model with a multidimensional geometry and quadratic scalar curvature is considered. For certain parameter ranges, the extra dimensions are stabilized if the internal...
Isospectrality of spherical MHD dynamo operators: pseudo-Hermiticity and a no-go theorem (2002)
The isospectrality problem is studied for the operator of the spherical hydromagnetic alpha^2-dynamo. It is shown that this operator is formally pseudo-Hermitian (J-symmetric) and lives in a Krein...
Asymptotical AdS from non-linear gravitational models with stabilized extra dimensions (2002)
Guenther, U., Moniz, P., Zhuk, A.
We consider non-linear gravitational models with a multidimensional warped product geometry. Particular attention is payed to models with quadratic scalar curvature terms. It is shown that for...
Activating convergent signal pathways in respiratory neurons of the ventral medullary group (2001)
Richter, DW, Bickmeyer, U, Bischoff, AM, Guenther, U, Haller, M, Lalley, PM, ...
No abstract available.
Activating convergent signal pathways in respiratory neurons of the ventral medullary group (2001)
Richter, D. W., Bickmeyer, U., Bischoff, A. M., Guenther, U., Haller, M., Lalley, P. M., ...
Comment on stability of atoms and nuclei in multidimensional TeV scale gravity (2000)
Guenther, U., Kuklov, A., Zhuk, A.
We discuss the stability of atoms and nucleons in the presence of multidimensional gravity characterized by the unified energy scale 1TeV. We point out that the multidimensional gravitational...
Gravitational Excitons as Dark Matter (2000)
In earlier work it was pointed out that for warped product spacetimes the conformal (geometrical moduli) excitations of the internal compactified factor spaces should be observable as massive scalar...
A note on dynamical stabilization of internal spaces in multidimensional cosmology (2000)
The possibility of dynamical stabilization of an internal space is investigated for a multidimensional cosmological model with minimal coupled scalar field as inflaton. It is shown that a successful...
Stabilization of internal spaces in multidimensional cosmology (2000)
Effective 4-dimensional theories are investigated which were obtained under dimensional reduction of multidimensional cosmological models with a minimal coupled scalar field as matter source....
Observable effects from extra dimensions (1999)
For any multidimensional theory with compactified internal spaces, conformal excitations of the internal space metric result in gravitational excitons in the external spacetime. These excitations...
Multidimensional perfect fluid cosmology with stable compactified internal dimensions (1998)
Multidimensional cosmological models in the presence of a bare cosmological constant and a perfect fluid are investigated under dimensional reduction to 4-dimensional effective models. Stable...
On stable compactification with Casimir-like potential (1998)
Guenther, U., Kriskiv, S., Zhuk, A.
Multidimensional cosmological models with a higher dimensional space-time manifold are investigated under dimensional reduction. In the Einstein conformal frame, the effective potential for the...
Gravitational excitons from extra dimensions (1997)
We study inhomogeneous multidimensional cosmological models with a higher dimensional space-time manifold under dimensional reduction and show that small inhomogeneous excitations of the scale...
Stable compactification and gravitational excitons from extra dimensions (1997)
We study inhomogeneous multidimensional cosmological models with a higher dimensional space-time manifold under dimensional reduction. Stability due to different types of effective potentials is...
Gravitational excitons from extra dimensions (1997)
Inhomogeneous multidimensional cosmological models with a higher dimensional space-time manifold are investigated under dimensional reduction. In the Einstein conformal frame, small excitations of...
Guenther, U, Herbst, H, Bauer, M, Isbert, C, Buhr, H-J, Riecken, E-O, ...
Collagen type XVIII (C18) is a nonfibrillar collagen of basement membranes. Its C-terminal fragment, endostatin, has been identified as an inhibitor of angiogenesis. C18 is predominantly expressed by...