33 citations · 150 across the 12 of their papers we have counts for
12 papers
Quantum and thermal pressures from light scalar fields
Hauke Fischer, Christian Käding, Mario Pitschmann
Light scalar fields play a variety of roles in modern physics, especially in cosmology and modified theories of gravity. For this reason, there is a zoo of experiments actively try…
Screened Scalar Fields in the Laboratory and the Solar System
Hauke Fischer, Christian Käding, Mario Pitschmann
The last few decades have provided abundant evidence for physics beyond the two standard models of particle physics and cosmology. As is now known, the by far largest part of our u…
Dynamical Casimir effect with screened scalar fields
Ana Lucía Báez-Camargo, Daniel Hartley, Christian Käding +1
Understanding the nature of dark energy and dark matter is one of modern physics' greatest open problems. Scalar-tensor theories with screened scalar fields like the chameleon mode…
Search for dark energy with neutron interferometry
Hauke Fischer, Christian Käding, Hartmut Lemmel +2
We use previously obtained experimental results by neutron interferometry to effectively constrain the parameter space of several prominent dark energy models. This investigation e…
Search for environment-dependent dilatons
Hauke Fischer, Christian Käding, René I. P. Sedmik +3
The environment-dependent dilaton field is a well-motivated candidate for dark energy and naturally arises in the strong coupling limit of string theory. In this article, we presen…
Dilaton-induced open quantum dynamics
Christian Käding, Mario Pitschmann, Caroline Voith
In modern cosmology, scalar fields with screening mechanisms are often used as explanations for phenomena like dark energy or dark matter. Amongst a zoo of models, the environment…
Green's function analysis of the Neutron Lloyd interferometer
Christian Käding, Mario Pitschmann, Hartmut Abele
The neutron optical Lloyd interferometer can serve as a potent experiment for probing fundamental physics beyond the standard models of particles and cosmology. In this article, we…
Vacuum energy, the Casimir effect, and Newton's non-constant
Benjamin Koch, Christian Käding, Mario Pitschmann +1
We explore two hypotheses. First, the possibility that the quantum vacuum energy density of the Casimir effect contributes to a (local) gravitational vacuum energy density. Second,…
Density matrix formalism for interacting quantum fields
Christian Käding, Mario Pitschmann
We provide a description of interacting quantum fields in terms of density matrices for any occupation numbers in Fock space in a momentum basis. As a simple example, we focus on a…
A new method for directly computing reduced density matrices
Christian Käding, Mario Pitschmann
We demonstrate the power of a first principle-based and practicable method that allows for the perturbative computation of reduced density matrix elements of an open quantum system…
Spectra of Neutron Wave Functions in Earth's Gravitational Field
Martin Suda, Manfried Faber, Joachim Bosina +5
The time evolution of a quantum wave packet in the linear gravity potential is known as Quantum Bouncing Ball. The qBounce collaboration recently observed such a system by dropping…
Quantum-enhanced screened dark energy detection
Daniel Hartley, Christian Käding, Richard Howl +1
We propose an experiment based on a Bose-Einstein condensate interferometer for strongly constraining fifth-force models. Additional scalar fields from modified gravity or higher d…