A5074797189- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Particle physics theoretical and experimental studies
- Quantum Electrodynamics and Casimir Effect
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Laser Technologies
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Quantum, superfluid, helium dynamics
- Astrophysics and Cosmic Phenomena
- Magneto-Optical Properties and Applications
- Photonic and Optical Devices
- Geophysics and Sensor Technology
- Superconducting and THz Device Technology
- Solar and Space Plasma Dynamics
- Thermal Radiation and Cooling Technologies
- Quantum Information and Cryptography
- Experimental and Theoretical Physics Studies
- Spectroscopy and Laser Applications
- Scientific Measurement and Uncertainty Evaluation
- Geomagnetism and Paleomagnetism Studies
- Quantum Mechanics and Applications
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2016-2025
Istituto Nazionale di Fisica Nucleare
1993-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
1998-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
1991-2014
Istituto Nazionale di Fisica Nucleare, Sezione di Pavia
2011
University of Trieste
1991-2011
University of Padua
1993-2002
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
1994-1998
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
1998
University of Pisa
1998
We report on the measurement of Casimir force between conducting surfaces in a parallel configuration. The is exerted silicon cantilever coated with chromium and similar rigid surface detected by looking at shifts induced frequency when latter approached. scaling distance was tested 0.5-3.0 microm range, related coefficient determined 15% precision level.
We report the experimental observation of a light polarization rotation in vacuum presence transverse magnetic field. Assuming that data distribution is Gaussian, average measured (3.9 +/- 0.5) x 10(-12) rad/pass, at 5 T with 44 000 passes through 1 m long magnet, lambda = 1064 nm. The relevance this result terms existence light, neutral, spin-zero particle discussed.
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
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...
To account for the dark-matter content in our Universe, postinflationary scenarios predict QCD axion a mass range $(10--{10}^{3})\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$. Searches with haloscope experiments this require monitoring of resonant cavity modes frequency above 5 GHz, where several experimental limitations occur due to linear amplifiers, small volumes, and low quality factors copper cavities. In paper, we deal last issue, presenting result search galactic axions using based on...
A haloscope of the QUAX--$a\gamma$ experiment composed an oxygen-free high thermal conductivity-Cu cavity inside 8.1 T magnet and cooled to $\sim200$ mK is put in operation for search galactic axion with mass $m_a\simeq43~\mu\text{eV}$. The power emitted by resonant amplified a Josephson parametric amplifier whose noise fluctuations are at standard quantum limit. With data collected about 1 h frequency $\nu_c=10.40176$ GHz, reaches sensitivity necessary detection QCD-axion, setting $90\%$...
We have searched for light scalar and/or pseudoscalar particles that couple to two photons by studying the propagation of a laser beam ($\ensuremath{\lambda}=514$ nm) through transverse magnetic field. A limit 3.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ rad was set on possible optical rotation polarization an effective path length 2.2 km in 3.25 T find coupling...
In 2006 the PVLAS collaboration reported observation of an optical rotation generated in vacuum by a magnetic field. To further check against possible instrumental artifacts, several upgrades to apparatus have been made during past year. Two data taking runs, at wavelength 1064 nm, performed new configuration with field strengths 2.3 and 5 T. The T value was chosen order avoid stray fields. observations do not show presence signal down levels...
A ferromagnetic axion haloscope searches for dark matter in the form of axions by exploiting their interaction with electronic spins. It is composed an axion-to-electromagnetic field transducer coupled to a sensitive rf detector. The former photon-magnon hybrid system, and latter based on quantum-limited Josephson parametric amplifier. system consists ten 2.1 mm diameter yttrium iron garnet spheres single microwave cavity mode means static magnetic field. Our setup most spin magnetometer...
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.
A haloscope of the QUAX--$a\ensuremath{\gamma}$ experiment, composed an high-$Q$ resonant cavity immersed in a 8 T magnet and cooled to $\ensuremath{\sim}4.5\text{ }\text{ }\mathrm{K}$ is operated search for galactic axions with mass ${m}_{a}\ensuremath{\simeq}42.8\text{ }\ensuremath{\mu}\mathrm{eV}$, not accessible other running experiments. The design hollow dielectric cylinders concentrically inserted OFHC Cu cavity, allowed us maintain loaded quality-factor...
In order to observe the Casimir radiation we propose a new experimental scheme with no mechanically moving mirror. fact estimate that power required for sustained mechanical vibration would be beyond present possibilities. Our apparatus consists of superconducting electromagnetic resonant cavity wall covered by semiconductor layer whose reflectivity is driven laser at gigahertz frequencies. The thus acts as Preliminary laboratory tests showed can indeed reflect microwaves efficiently...
We have searched for a flux of axions produced in the Sun by exploiting their conversion to x rays static magnetic field. The signature solar axion would be an increase rate detected telescope when passes within its acceptance. From absence such signal we set 3\ensuremath{\sigma} limit on coupling two photons ${\mathit{g}}_{\mathit{a}\ensuremath{\gamma}\ensuremath{\gamma}}$\ensuremath{\equiv}1/M3.6\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}9}$...
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...
Axions, originally proposed to solve the strong CP problem of quantum chromodynamics, emerge now as leading candidates WISP dark matter. The rich phenomenology associated light and stable QCD axion can be described an effective magnetic field that experimentally investigated. For QUAX experiment, matter axions are searched by means their resonant interactions with electronic spins in a magnetized sample. In principle, axion-induced magnetization changes detected embedding sample rf cavity...
In a circulating cavity magnon polariton (quantized spin wave plus photon, resonating in microwave chamber), the hybrid state and noninteracting photonic rotate opposite directions---an important phenomenon for generating chiral states of electromagnetic modes magnonics engineering, to impart angular momentum upon standing waves. This study demonstrates unidirectional nature mode propagation, paving way generation high-power beam with high coherence narrow bandwidth. The authors also...
A traveling wave parametric amplifier has been integrated in the haloscope of QUAX experiment. search for dark matter axions performed with a high-$Q$ dielectric cavity immersed an 8 T magnetic field and read by detection chain having system noise temperature about 2.1 K at frequency 10.353 GHz. Scanning conducted varying using sapphire rods into cavity. At multiple operating frequencies, sensitivity instrument was level viable axion models.
We demonstrate a laser system with frequency instability of 0.7 Hz for integration times 20 s, corresponding to $2.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ fractional instability. This is the lowest short-term any current oscillator. The uses diode-pumped miniature Nd:YAG lasers stabilized sapphire Fabry-P\'erot reference cavities at liquid helium temperature. Cryogenic optical resonators are promising precision experiments, such as high-resolution spectroscopy, flywheel...
We describe the principle and status of PVLAS experiment which is presently running at INFN section Ferrara, Italy, to detect magnetic birefringence vacuum. This related QED vacuum structure can be detected by measuring ellipticity acquired a linearly polarized light beam propagating through strong field. Such an effect predicted Euler-Heisenberg Lagrangian. The method also sensitive other hypothetical physical effects such as axion-like particles in general any fermion/boson millicharged...
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 demonstrate an all-optical method for manipulating the magnetization in a 1-mm yttrium-iron-garnet (YIG) sphere placed $\ensuremath{\sim}0.17\text{ }\text{ }\mathrm{T}$ uniform magnetic field. A harmonic of frequency comb delivered by multi-GHz infrared laser source is tuned to Larmor YIG drive oscillations, which turn give rise radiation field used thoroughly investigate phenomenon. The damping issue that occurs at high and presence highly magnetizated materials has been overcome...
In the search for axionic dark matter, high-frequency part of quantum chromodynamics (QCD) axion parameter space is favored, as indicated by both cosmological and astrophysical arguments recent indications from lattice QCD calculations. To extend probing range cavity haloscopes, solutions addressing unfavorable scaling volume with frequency must be developed. Here, we present a novel type high-volume thin-shell resonator haloscope dark-matter searches. The formed two nested coaxial...
Experimental bounds on induced vacuum magnetic birefringence can be used to improve present photon-photon scattering limits in the electronvolt energy range. Measurements with Polarizzazione del Vuoto con Laser apparatus [E. Zavattini et al., Phys. Rev. D 77, 032006 (2008)] at both $\ensuremath{\lambda}=1064$ and 532 nm lead parameter ${A}_{e}$, describing nonlinear effects QED, of ${A}_{e}^{(1064)}<6.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}\text{ }\text{...