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Let $\Omega$ be some domain in the hyperbolic space $\Hn$ (with $n\ge 2$) and $S_1$ the geodesic ball that has the same first Dirichlet eigenvalue as $\Omega$. We prove the Payne-P\'olya-Weinberger… (More)

- Helmut Linde, Manuel G. Velarde, W. Waldhelm, Andreas Wierschem
- Journal of colloid and interface science
- 2001

Collisions and reflections of solitary waves and (periodic) wave trains driven by surface tension gradients (Marangoni stresses) exhibit a wealth of astonishing features. Depending on the angle… (More)

For a quantum particle interacting with a short-range potential, we estimate from below the shift of its binding threshold, which is due to the particle interaction with a quantized radiation field.

- Helmut Linde
- 2005

Consider a one dimensional quantum mechanical particle described by the Schroedinger equation on a closed curve of length $2\pi$. Assume that the potential is given by the square of the curve's… (More)

- Helmut Linde
- 2017

Quantum Field Theory (QFT) is the basis of some of the most fundamental theories in modern physics, but it is not an easy subject to learn. In the present article we intend to pave the way from… (More)

The purpose of this manuscript is to present a series of lecture notes on isoperimetric inequalities for the Laplacian, for the Schrödinger operator, and related problems.

- Bentvelsen, S. Colijn, +17 authors Z. van Vulpen
- 2011

Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at √ s = 7 TeV are presented. The luminosity is independently determined using… (More)

- Helmut Linde
- 2006

For mathematical models of quantum waveguides, we show that in some situations two interacting particles can be trapped more easily than a single particle. In particular, we give an example of a… (More)