A5050249995- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Astrophysics and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Advanced Frequency and Time Standards
- Particle Accelerators and Free-Electron Lasers
- Geomagnetism and Paleomagnetism Studies
- Magneto-Optical Properties and Applications
- Seismic Waves and Analysis
- Radio Astronomy Observations and Technology
- Magnetic Field Sensors Techniques
- Optical Polarization and Ellipsometry
- Particle accelerators and beam dynamics
- Characterization and Applications of Magnetic Nanoparticles
- Advanced NMR Techniques and Applications
- Black Holes and Theoretical Physics
Cardiff University
2019-2025
University of Birmingham
2024
Max Planck Institute for Gravitational Physics
2024
Leibniz University Hannover
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2013-2018
University of Ferrara
2017
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...
Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot and quantum radiation pressure noise. Here, we present first realization frequency-dependent squeezing in full-scale detectors, resulting reduction both noise, with broadband detector enhancement from tens hertz to several kilohertz. In LIGO Hanford detector, reduced amplitude by factor 1.6 (4.0 dB) near 1 kHz; Livingston was 1.9 (5.8 dB). These...
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...
Theories of quantum gravity based on the holographic principle predict existence fluctuations distance measurements that accumulate and exhibit correlations over macroscopic distances. This paper models an expected signal due to this phenomenology, details design estimated sensitivity co-located twin table-top 3D interferometers being built measure or constrain it. The experiment is be sensitive displacements $\sim10^{-19}\,\rm{m}/\sqrt{\rm{Hz}}$ in a frequency band between 1 250 MHz,...
Precision measurements of space and time, like those made by the detectors Laser Interferometer Gravitational-wave Observatory (LIGO), are often confronted with fundamental limitations imposed quantum mechanics. The Heisenberg uncertainty principle dictates that position momentum an object cannot both be precisely measured, giving rise to apparent limitation called Standard Quantum Limit (SQL). Reducing noise below SQL in gravitational-wave detectors, where photons used continuously measure...
The Heisenberg uncertainty principle dictates that the position and momentum of an object cannot be simultaneously measured with arbitrary precision, giving rise to apparent limitation known as standard quantum limit (SQL). Gravitational-wave detectors use photons continuously measure positions freely falling mirrors so are affected by SQL. We investigated performance Laser Interferometer Gravitational-Wave Observatory (LIGO) after experimental realization frequency-dependent squeezing...
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 work, we present the first experimental upper limits on presence of stochastic ultra-high-frequency gravitational waves. We exclude waves in frequency bands from $(2.7 - 14)\times10^{14}~$Hz and $(5 12)\times10^{18}~$Hz down to a characteristic amplitude $h_c^{\rm min}\approx6\times 10^{-26}$ min}\approx 5\times 10^{-28}$ at $95~$% confidence level, respectively. To obtain these results, used data existing facilities that have been constructed operated with aim detecting WISPs...
We report on a direct search for scalar field dark matter using data from LIGO's third observing run. analyze the coupling of size oscillations interferometer's beam splitter and arm test masses that may be caused by matter. Using new efficient methods to maximize sensitivity signatures such oscillations, we set upper limits constants as function its mass, which improve upon bounds previous searches up four orders magnitude in frequency band 10 180 Hz.
A novel polarisation modulation scheme for polarimeters based on Fabry-Perot cavities is presented. The application to the proposed HERA-X experiment aiming measuring magnetic birefringence of vacuum with HERA superconducting magnets discussed.
In this work, we propose polarimetry experiments to search for low-mass (sub-eV) bosonic field dark matter, including axions and axion-like particles. We show that a configuration consisting of thick birefringent solid inside Fabry-P\'erot cavity is exceptionally sensitive scalar which may cause oscillatory variations in the solid's thickness refractive index. addition, reconfiguration experiment, two quarter-wave plates are placed instead solid, very investigate possibility using...
Abstract Axions and axion-like particles (ALPs) are leading candidates for dark matter. They well motivated in many extensions of the standard model supported by astronomical observations. We propose an iterative transformation existing facilities gravitational-wave detector technology testbed GEO600, located near Ruthe Germany, into a kilometre-scale upgrade laser-interferometric axion LIDA. The final DarkGEO could search coincident signatures axions ALPs significantly surpass current...
Although experimental efforts have been active for about 30 years, a direct laboratory observation of vacuum magnetic birefringence, due to fluctuations, still needs confirmation: the predicted birefringence is $$\Delta n = 4.0\times 10^{-24}$$ @ 1 T. Key ingredients polarimeter detecting such small are long optical path within field and time dependent effect. To lengthen Fabry–Perot generally used with finesse ranging from $${{\mathscr {F}}} \approx 10^4$$ 7\times 10^5$$ . Interestingly,...
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 experimental investigation of fundamental theories Physics nowadays is more and related to the development new cutting-edge technologies. We are exploiting most advanced techniques used in gravitational waves detectors search for quantum fluctuations space-time as predicted by some gravity. For this purpose, we building twin co-located interferometers that targeted achieve unprecedented levels sensitivity. Exploiting technology, like squeezed states light, will allow further reduction...
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 on a direct search for scalar field dark matter using data from LIGO's third observing run. analyse the coupling of size oscillations interferometer's beamsplitter and arm test masses that may be caused by matter. Using new efficient methods to maximise sensitivity signatures such oscillations, we set upper limits constants as function its mass, which improve upon bounds previous searches several orders magnitude in frequency band 10 Hz 180 Hz.
The Regeneration Cavity (RC) is a critical component of the Any Light Particle Search II (ALPS II) experiment. It increases signal from possible axions and axion-like particles in experiment by nearly four orders magnitude. total round-trip optical losses power circulating cavity must be minimized order to maximize resonant enhancement cavity, which an important figure merit for ALPS II. Lower also increase storage time with 123 meter long RC we have demonstrated longest two-mirror cavity....