A5015514840- Quantum Electrodynamics and Casimir Effect
- Cosmology and Gravitation Theories
- Mechanical and Optical Resonators
- Noncommutative and Quantum Gravity Theories
- Black Holes and Theoretical Physics
- Experimental and Theoretical Physics Studies
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Thermal Radiation and Cooling Technologies
- Quantum, superfluid, helium dynamics
- Advanced MEMS and NEMS Technologies
- Relativity and Gravitational Theory
- Advanced Measurement and Metrology Techniques
- Quantum Mechanics and Applications
- Statistical Mechanics and Entropy
- Complex Systems and Time Series Analysis
- Advanced NMR Techniques and Applications
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Scientific Research and Discoveries
- Plasma Diagnostics and Applications
- Astro and Planetary Science
- Gas Dynamics and Kinetic Theory
TU Wien
2008-2024
Vrije Universiteit Amsterdam
2013-2024
Pontificia Universidad Católica de Chile
2022
Institut Laue-Langevin
2019
Austrian Institute of Technology
2007-2009
Seibersdorf Laboratories (Austria)
2007
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 present very first experimental constraints on parameters model. For this, employ data obtained from qBounce collaboration Lunar Laser Ranging (LLR) experiment. Furthermore, forecast expected Casimir And Non Newtonian force EXperiment (Cannex) soon to be realised an improved setup. Finally, provide detailed analysis...
During the past few decades, abundant evidence for physics beyond two standard models of particle and cosmology was found. Yet, we are tapping in dark regarding our understanding sector. For more than a century, open problems related to nature vacuum remained unresolved. As well as traditional high-energy frontier cosmology, technological advancement provides complementary access new via high-precision experiments. Among latter, Casimir And Non-Newtonian force EXperiment (Cannex) has...
The search for non-Newtonian forces has been pursued following many different paths. Recently it was suggested that hypothetical chameleon interactions, which might explain the mechanisms behind dark energy, could be detected in a high-precision force measurement. In such an experiment, interactions between parallel plates kept at constant separation measured as function of pressure ambient gas, thereby identifying by their unique inverse dependence on local mass density. During past years...
We consider the Cannex (Casimir And Non-Newtonian force EXperiment) test of quantum vacuum intended for measuring gradient Casimir pressure between two flat parallel plates at large separations and constraining parameters chameleon model dark energy in cosmology. A modification measurement scheme is proposed that allows simultaneous measurements both its one experiment. It shown with several improvements will be capable to strengthen constraints on Yukawa-type interaction by up an order...
The Casimir And Non-Newtonian force Experiment(Cannex) was designed to detect and hypothetical fifth forces between truly parallel plates of cm size, set 10–30 μm apart. With sub-pN sensitivity large interacting areas, the experiment aims settle a long-standing question physics regarding role dissipation at zero frequency in description dielectric functions. Active measurement control parallelism allows accurately probe non-standard geometries, such as crossed cylinders or cylinder opposing...
We propose a test on the role of relaxation properties conduction electrons in Casimir pressure between two parallel metal-coated plates kept at different temperatures. It is shown that for sufficiently thick metallic coatings and gradient are determined by mean equilibrium contributions calculated temperatures term independent separation. Numerical computations nonequilibrium pressures performed Au finite thickness as function separation temperature one using plasma Drude models...
Abstract Spectroscopic methods allow to measure energy differences with unrivaled precision. In the case of gravity resonance spectroscopy, different gravitational states are measured without recourse electromagnetic interaction. This provides a very pure and background-free look at gravitation topics related central problem dark matter short distances. this article, we analyse effect scalar symmetron fields, leading candidate for screened field, place limits in large volume parameter space.
Abstract Numerous tabletop experiments have been dedicated to exploring the manifestations of screened scalar field dark energy, such as symmetron or chameleon fields. Precise theoretical predictions require simulating configurations within respective experiments. This paper focuses onto less-explored environment-dependent dilaton field, which emerges in strong coupling limit string theory. Due its exponential self-coupling, this can exhibit significantly steeper slopes compared and fields,...
Based on our recent findings regarding (non-)renormalizability of non-commutative U⋆(1) gauge theories [1, 2] we present the construction a new type model. By introducing soft-breaking term in such way that only bilinear part action is modified, no interaction between sector and auxiliary fields occurs. Demanding addition latter form BRST doublet structures, this leads to minimally altered model featuring an IR damping behavior. Moreover, breaking shown provide necessary structure order...
SMART-1 has been the first European mission using a Hall thruster to reach moon. An onboard plasma diagnostic package allowed detailed characterization of exhaust and its interactions with spacecraft. Analysis in-flight data revealed, amongst others, an unpredicted large cyclic variation spacecraft floating potential mysterious asymmetry in surrounding To investigate details anomalies, we developed numerical software tool SmartPIC characterize predict spacecraft-plasma interactions....
A customized atomic force microscope has been utilized in dynamic mode to measure hydrodynamic forces between a sphere and flat plate, both coated with gold. In order study the influence of mean free path on slippage without systematic errors due varying surface properties, all data have acquired at precisely same spot plate. Local accommodation coefficients slip lengths extracted from experimental for He, Ne, Ar, Kr, as well N2, CO2, C2H6, Knudsen numbers 3 × 10−4 3. We found that is...
Many theoretical approaches aiming to explain dark matter or energy predict variations of Newton’s law gravity at sub-millimeter separations. In this low-energy domain, force metrology provides an alternative astronomical observations and high-energy experiments in the search for new physics. The Casimir And Non-Newtonian EXperiment (CANNEX) has been designed from ground up allow metrological measurements between truly parallel macroscopic flat plates separation range 3–30 micrometer....
Motivated by the recent work of Vilar et al. (arXiv:0902.2956) we enhance our non-commutative translation invariant gauge model (Blaschke D. N. al., arXiv:0901.1681) introducing auxiliary fields and ghosts forming a BRST doublet structure. In this way localization problematic term can be achieved without necessity for any additional degrees freedom. The resulting theory is suspected to renormalizable. A rigorous proof, however, has not been accomplished up now.
Neutrons are the ideal probes to test gravity at short distances – electrically neutral and only hardly polarizable. Furthermore, very slow, so-called ultracold neutrons form bound quantum states in potential of Earth. This allows combining experiments with powerful resonance spectroscopy techniques, as well tests interplay between mechanics. In last decade, q Bounce collaboration has been performing several measurement campaigns cold neutron facility PF2 Institut Laue-Langevin. A new...
The Casimir and electromagnetic interactions between objects at short separations are strongly influenced by the local geometry near point of closest approach. In this paper we demonstrate that assumptions underlying common statistical analyses roughness may not hold in experiments using microspheres as interacting objects. Based on an extensive experimental numerical analysis surface topology widely used colloidal particle types 4310A 4320A, show actual variation curvature give rise to...
This paper carries forward a series of articles describing our enterprise to construct gauge equivalent for the θ-deformed non-commutative 1 p 2 model originally introduced by Gurau et al. [Comm.Math.Phys.287 (2009), 275-290].It is shown that breaking terms form used Vilar [J.Phys.A: Math.Theor.43 (2010), 135401, 13 pages] and ourselves [Eur.Phys.J. C: Part.Fields 62 [433][434][435][436][437][438][439][440][441][442][443] localize BRST covariant operator D θ -1 lead difficulties concerning...
Abstract Hypothetical short-range interactions could be detected by measuring the wavefunctions of gravitationally bound ultracold neutrons (UCNs) on a mirror in Earth's gravitational field. Searches for them with higher sensitivity require detectors spatial resolution. We developed and have been improving an UCN detector high resolution, which consists Si substrate, thin converter layer including ^10B_4C, fine-grained nuclear emulsion. Its resolution was estimated to less than 100 nm...
Ultracold neutrons (UCNs) are formidable probes in precision tests of gravity. With their negligible electric charge, dielectric moment, and polarizability they naturally evade some the problems plaguing gravity experiments with atomic or macroscopic test bodies. Taking advantage this fact, q B ounce collaboration has developed a technique – resonance spectroscopy (GRS) to study bound quantum states UCN field Earth. This is used as high-precision tool search for hypothetical Non-Newtonian on...
The idea of quantum mechanical vacuum energy contributing to the cosmological density is not new. However, despite persisting constant problem, few investigations have focused on this subject. We explore possibility that contributes (local) gravitational in framework a scale-dependent Λ and Newton’s G. This hypothesis has several important consequences, ranging from scale-dependence hypothetical prospect novel experimental insight concerning origin density.