A5075647859- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Quantum Electrodynamics and Casimir Effect
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Geomagnetism and Paleomagnetism Studies
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Mechanical and Optical Resonators
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Advanced Frequency and Time Standards
- Advanced Thermodynamics and Statistical Mechanics
- Characterization and Applications of Magnetic Nanoparticles
- Optical Polarization and Ellipsometry
- Random lasers and scattering media
- Geophysics and Sensor Technology
- Superconducting and THz Device Technology
- High-pressure geophysics and materials
- Advanced Mathematical Theories and Applications
- Neutrino Physics Research
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2009-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2012-2023
Federico II University Hospital
2023
University of Florida
2019-2022
Johannes Gutenberg University Mainz
2016
University of Trieste
2011
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2009-2011
University of Padua
2006-2009
Istituto Nazionale di Fisica Nucleare
2008
Vacuum magnetic birefringence was predicted long time ago and is still lacking a direct experimental confirmation. Several efforts are striving to reach this goal, the sequence of results promises success in next few years. This measurement generally accompanied by search for hypothetical light particles that couple two photons. The PVLAS experiment employs sensitive polarimeter based on high finesse Fabry–Perot cavity. In paper we report latest experiment. data analysed taking into account...
This paper describes the 25 year effort to measure vacuum magnetic birefringence and dichroism with PVLAS experiment. The experiment went through two main phases: first using a rotating superconducting magnet second permanent magnets. was not able reach predicted value from QED. Nonetheless has set current best limits on for field of Bext=2.5 T, namely, Δn(PVLAS)=(12±17)×10−23 |Δκ|(PVLAS)=(10±28)×10−23. uncertainty Δn(PVLAS) is about factor 7 above Δn(QED)=2.5×10−23 @ 2.5 T.
Several groups are carrying out experiments to observe and measure vacuum magnetic birefringence, predicted by quantum electrodynamics (QED). We have started running the new PVLAS apparatus installed in Ferrara, Italy, measured a noise floor value for unitary field birefringence of $\mathrm{\ensuremath{\Delta}}{n}_{u}^{(\mathrm{vac})}=(4\ifmmode\pm\else\textpm\fi{}20)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}23}\text{ }\text{ }{\mathrm{T}}^{\ensuremath{-}2}$ (the error represents...
The PVLAS collaboration is presently assembling a new apparatus (at the INFN section of Ferrara, Italy) to detect vacuum magnetic birefringence (VMB). VMB related structure QED and predicted by Euler-Heisenberg-Weisskopf effective Lagrangian. It can be detected measuring ellipticity acquired linearly polarised light beam propagating through strong field. Using very same optical technique it also possible search for hypothetical low-mass particles interacting with two photons, such as...
We report on the resonant Fabry Perot cavity of PVLAS (Polarization Vacuum with LASer) experiment operating at λ = 1064 nm a record decay time 2.7 ms, factor more than two larger any previously reported optical resonator. This corresponds to coherence length 8.1 · 10(5) m. The is 3.303 m, and resulting finesse 770,000.
In this paper we report the status of experiment MIR (Motion Induced Radiation), aimed at experimental verification dynamical Casimir effect. The stringent theoretical requirements to observe effect are satisfied in a scheme which conductivity semiconductor inside superconducting microwave resonant cavity is varied time. Free carriers periodically excited and recombine 5 GHz. process vacuum thermal photons parametrically amplified time interval 200-500 ns.
A novel experimental set-up for the measurement of Casimir effect at separations larger than a few microns is presented. The apparatus based on mechanical resonator and will use homodyne detection technique to sense force in plane–parallel configuration.
The overuse and inappropriate use of antibiotics pose a grave threat to public health, contributing significantly the accelerated development antimicrobial resistance (AMR) increased rates morbidity mortality, making it leading cause death globally. To examine relationship between demographic variables knowledge, attitudes, behaviors concerning antibiotic use, survey-based cross-sectional study was conducted involving 1158 individuals. questionnaire included two sections: in first section,...
An experimental set-up for the measurement of Casimir effect at separations larger than a few microns is presented. The apparatus based on mechanical resonator and uses homodyne detection technique to sense force in plane-parallel configuration. First measurements 3-10 micrometer range show an unexpected large probably due patch effects.
We explore the application of heterodyne interferometry for a weak-field coherent detection scheme. The methods detailed here will be used in ALPS II, an experiment designed to search weakly-interacting, sub-eV particles. For II reach its design sensitivity this system must capable accurately measuring fields with equivalent amplitudes on order 10$^{-5}$ photons per second or greater. present initial results dark count rate $10^{-5}$ as well successful generation and signal field strength...
We report on a high-energy solid-state laser based master-oscillator power-amplifier system seeded by 5-GHz repetition-rate mode-locked oscillator, aimed at the excitation of dynamic Casimir effect optically modulating microwave resonator. Solid-state amplifiers provide up to 250 mJ 1064 nm in 500-ns (macro-)pulse envelope containing 12-ps (micro-)pulses, with macro/micropulse format and energy resembling that near-infrared free-electron lasers. Efficient second-harmonic conversion allowed...
We describe recent improvements in the development of high power laser system used motion induced radiation (MIR) experiment to amplify electromagnetic fields inside a microwave cavity. The made on oscillator stabilization, pulse train shaping device, and spatial beam uniformity are reported.
Although quantum mechanics (QM) and field theory (QFT) are highly successful, the seemingly simplest state — vacuum remains mysterious. While LHC experiments expected to clarify basic questions on structure of QFT vacuum, much can still be done at lower energies as well. For instance, like PVLAS try reach extremely high sensitivities, in their attempt observe effects interaction visible or near-visible photons with intense magnetic fields a process which becomes possible electrodynamics...
The use of radio frequencies (RF) superconducting re-entrant cavities has been suggested in the framework some research to detect photon generation from vacuum, due dynamical Casimir effect. A thin semiconducting slab, put inside cavity, will be excited by a train laser pulses frequency twice resonant so that periodic modulation dielectric constant slab realized. In order produce RF cavity can safely work at temperatures larger than 4 K, we have designed and constructed <formula...
Indoor household pollution is not yet sufficiently studied in the general population. Over 4 million people die prematurely every year due to air households. This study aimed propose quantitative data research through administration of a KAP (Knowledge, Attitudes, and Practices) Survey Questionnaire. cross-sectional administered questionnaires adults from metropolitan city Naples (Italy). Three Multiple Linear Regression Analyses (MLRA) were developed, including Knowledge, Behavior regarding...
We present an experimental systematics study of the polarimetric method for measuring vacuum magnetic birefringence based on a pair rotating half-wave plates. The presence systematic effect at same frequency as sought magneto-optical inhibits use strictly constant fields. characterise this systematic, discuss its origin and propose viable workaround.
The PVLAS collaboration is presently assembling a new apparatus to detect vacuum magnetic birefringence.This property related the structure of QED and predicted by Euler-Heisenberg-Weisskopf effective Lagrangian.It can be detected measuring ellipticity acquired linearly polarised light beam propagating through strong field.Here we report results scaled-down test setup briefly describe apparatus.This latter one in construction based on high-sensitivity ellipsometer with high-finesse...
This paper describes the 25 year effort to measure vacuum magnetic birefringence and dichroism with PVLAS experiment. The experiment went through two main phases: first using a rotating superconducting magnet second permanent magnets. was not able reach predicted value from QED. Nonetheless set current best limits on for field of $B_{\rm ext} = 2.5$ T, namely, $\Delta n^{\rm (PVLAS)} (12\pm17)\times10^{-23}$ $|\Delta\kappa|^{\rm (10\pm28)\times10^{-23}$. uncertainty (PVLAS)}$ is about factor...
We report the first ever measurements of thermalization length low-energy electrons injected into solid para-hydrogen at a temperature T ≈ 2.8 K. The use pulsed Townsend photoinjection technique has allowed us to investigate behavior quasi-free rather than massive, slow negative charges, as reported in all previous literature. have found an average ⟨z0⟩ = 26.1 nm, which is three five times longer that liquid helium same temperature.
The Any Light Particle Search II (ALPS II) is an experiment currently being built at DESY in Hamburg, Germany, that will use a light-shining-through-a-wall (LSW) approach to search for axion-like particles. ALPS represents significant step forward these types of experiments as it 24 superconducting dipole magnets, along with dual, high-finesse, 122 m long optical cavities. This paper gives the first comprehensive recipe realization idea, proposed over 30 years ago, cavities before and after...