Mr
Jerome Degallaix
(Laboratoire des Matériaux Avancés - CNRS)
01/03/2018, 11:10
Upgrade from second generation interferometers and third generation ones will require larger size optics as well as new material substrates to handle low temperatures. In parallel to this technological challenges, a worldwide intensive research is underway to lower the coating thermal noise from the mirrors.
In this presentation, we will review the technological development and future plans...
Daniel Penkert
(AEI Hannover)
01/03/2018, 11:40
The space-borne gravitational wave observatory LISA aims to measure sources in the 0.1 mHz to 1 Hz frequency range. Core to this measurement is the optical readout of differential path lengths between free-floating test masses aboard three satellites orbiting the sun in a tilted cartwheel formation. On average, the satellites’ positions form an equilateral triangle of 2.5 million km...
Dr
Shtefan Danilishin
(University of Glasgow)
01/03/2018, 14:00
It is hard to overestimate the scientific significance of the 6 confirmed detections of gravitational waves from compact binary sources that Advanced LIGO and Advanced Virgo have jointly made. However, it is still a long way ahead until the sensitivity of GW detectors is high enough to make them fully fledged astronomical tools. The main hindrance on this way remains the quantum noise, the...
Mrs
Stefanie Kroker
(PTB and TU Braunschweig)
01/03/2018, 14:30
Thermal noise is known to be a crucial limitation for high precision sensing devices like future gravitational wave detectors or lasers with extreme narrow linewidths. Mitigating Brownian thermal noise as an important issue requires the reduction of the mechanical loss of involved materials and/or their deliberate spatial distribution. In this contribution we discuss the influence of...
Dr
Matteo Leonardi
(NAOJ)
01/03/2018, 14:50
Kagra is the first 2.5G gravitational wave (GW) detector and it
incorporates some very challenging new technologies such as underground
facility and cryogenic sapphire mirrors. Another new technology that was
not in the base road-map of any GW detector but nowadays is addressed as
a crucial upgrade is frequency dependent squeezing.
I'll give some highlights on the Kagra detector and...
Dr
Antonio Perreca
(TIFP)
01/03/2018, 15:10
The Laser Interferometer Gravitational-wave Observatory (LIGO) and Virgo have recently opened a new window for astronomy by detecting gravitational-waves from coalescing black holes and from neutron star merger. The LIGO/Virgo Scientific Collaboration is exploring ways to increase range and sensitivity by applying promising new techniques for current and next generation gravitational-wave...
Dr
Philippe BOUYER
(CNRS - IOGS)
02/03/2018, 14:00
Invited
I will review the progress towards large-scale differential gravitational measurement is using an array of Atom Interferometers (AIs) configured to differentiate Newtonian Noise, geodetic signal and GW detection. In this gravitation antenna, each of the AIs measures the local gradient of gravitational acceleration and the correlation between distant sensors enables to cancel out fluctuations...
Mr
Miguel Dovale-Alvarez
(University of Birmingham)
02/03/2018, 14:30
Atom interferometers employing optical cavities to enhance the beam splitter pulses promise significant advances in science and technology, notably for future gravitational wave detectors. Long cavities, on the scale of hundreds of meters, have been proposed in experiments aiming to observe gravitational waves with frequencies below 1 Hz, where laser interferometers, such as LIGO, have poor...
Giuliana Russano
(Università di Trento/TIFPA)
02/03/2018, 15:10
The relative acceleration between two test masses free falling in orbit is perturbed by the presence of a larger constant relative acceleration that must be actively compensated in order to keep the test bodies centered inside the orbiting apparatus. The actuation force applied to compensate this effect can be applied continuously or can be limited to brief impulses, with test masses in a...
Martina De Laurentis
(NA)
02/03/2018, 15:50
One of the oldest questions concerning quantum mechanics and gravitation is whether vacuum fluctuations do gravitate. The question of the weight of vacuum was raised soon after the birth of quantum mechanics
and many theoretical attempts were performed to explore the motivations and consequences of assuming or discarding such hypothesis, and jet today there no a complete theretical...
