A5037501866- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Statistical and numerical algorithms
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Radio Astronomy Observations and Technology
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Radioactive Decay and Measurement Techniques
- Magnetic confinement fusion research
- Seismology and Earthquake Studies
- Quantum, superfluid, helium dynamics
- Radiology practices and education
- Inertial Sensor and Navigation
Inter-University Centre for Astronomy and Astrophysics
2020-2024
Max Planck Institute for Gravitational Physics
2018-2021
Leibniz University Hannover
2021
LIGO Scientific Collaboration
2015-2016
California Institute of Technology
2011-2014
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2008-2009
Imperial College London
2009
University of Pisa
2009
Abstract The nature of dark matter remains unknown to date, although several candidate particles are being considered in a dynamically changing research landscape 1 . Scalar field is prominent option that explored with precision instruments, such as atomic clocks and optical cavities 2–8 Here we describe direct search for scalar using gravitational-wave detector, which operates beyond the quantum shot-noise limit. We set new upper limits on coupling constants function its mass, by excluding...
The small satellite 'Galileo Galilei' (GG) will test the universality of free fall and hence weak equivalence principle which is founding pillar general relativity to 1 part in 1017. It use proof masses whose atoms differ substantially from one another their mass energy content, so as maximize chance violation. GG improve by four orders magnitude current best 'Eöt-Wash' tests based on slowly rotating torsion balances, have been able reach thermal noise level. In GG, expected violation signal...
Long baseline laser interferometers used for gravitational wave detection have proven to be very complicated control. In order sufficient sensitivity astrophysical waves, a set of multiple coupled optical cavities comprising the interferometer must brought into resonance with field. A multi-input, multi-output servos then lock these place via feedback This procedure, known as acquisition, has vexing problem and reduced greatly reliability duty factor past generation interferometers. this...
Mechanical oscillators can be sensitive to very small forces. Low frequency effects are up-converted higher by rotating the oscillator. We show that for 2-dimensional at much than signal thermal noise force due internal losses and competing with it is abated as square root of rotation frequency. also natural one possible if oscillator has 2 degrees freedom, describe how this property applies torsion balances. In addition, in 2D above resonance without being attenuated 1D case, thus relaxing...
The integration time required by space experiments to perform high accuracy tests of the universality free fall and weak equivalence principle is a crucial issue. It inversely proportional square acceleration be measured, which extremely small; duration mission severe limitation in lack repeatability. An exceedingly long can therefore rule out target. We have evaluated due thermal noise from gas damping, Johnson eddy currents---which are independent signal frequency---and internal known...
Abstract The discovery of Dark Energy and the fact that only about 5% mass universe can be explained on basis current laws physics have led to a serious impasse. Based past history, might indeed verge major discoveries; but challenge is enormous. way tackle it twofold. On one side, scientists try perform large scale direct observations measurements – mostly from space. other, they multiply their efforts put most stringent tests ever physical theories underlying view world, very small large....
Abstract The nature of dark matter remains unknown to date and several candidate particles are being considered in a dynamically changing research landscape [1]. Scalar field is prominent option that explored with precision instruments such as atomic clocks optical cavities [2-8]. Here we report on the first direct search for scalar utilising gravitational-wave detector operating beyond quantum shot-noise limit. We set new upper limits coupling constants function its mass by excluding...
Modulated differential wavefront sensing (MDWS) is an alignment control scheme in the regime of beams with strong higher order transversal modes (HOMs). It based on (DWS) technique. MDWS represents a significant upgrade over conventional techniques used presence high HOM content as it allows for bandwidths while eliminating need auxiliary modulations, that otherwise cause loss applied squeezing. The output port gravitational wave (GW) interferometers (IFO) one such place where lot HOMs are...