The Centre for Gravitational Physics (CGP) was founded to undertake research and development for instrumentation for the detection of gravitational waves. These technologies use laser interferometers to sense tiny displacements. At the CGP we developed and installed instrumentation and control systems in the Laser Interferometer Gravitational wave Observatory (LIGO) and in the GRACE Follow-On mission. We have also spun-off gravitational wave detection technologies into a number of related research fields.
Most of the research in the group is directed towards gravitational wave detection, the related area of high precision measurement, and the exploitation of gravitational waves for astronomy. Our specific research interests include advanced interferometer configurations and control systems, measurement of thermal and quantum noise, quantum noise cancellation and quantum-non-demolition techniques, data analysis, digital interferometry, Gravity Recovery and Climate Experiment (GRACE) Follow-On Mission, and frequency stabilisation for the Laser Interferometer Space Antenna (eLISA). For further information on our research please have a look at the various research pages. The group has a purpose built laboratory for experimental work and access to premier computing facilities. The group also has links with the ANU Quantum Optics Group.
The ANU Centre for Gravitational Physics is located within the Department of Quantum Science. We are a member institution of the Australian Consortium for Interferometric Gravitational wave Astronomy (ACIGA). We work closely with the Laser Interferometer Gravitational-wave Observatory (LIGO) and are members of the LIGO Scientific Collaboration (LSC) and have taken on specific responsibilities in the design and construction of Advanced LIGO (AdvLIGO).
The Hunt for Gravitational Waves Resumes
LIGO and VIRGO are set to resume their hunt for gravitational waves - ripples in space and time - on April 1. One of the key features of this round of search, which is also called O3, is employment of a technique called "squeezing” to reduce levels of quantum noise that can mask faint gravitational-wave signals. This technique was developed at ANU's Centre for Gravitational Physics, lead by Prof. David McClelland. As the result of the latest upgrades, the LIGO detectors are now about 40% more sensitive compared with the last two rounds of search, which means that they can survey an even larger volume of space for powerful, wave-making events, such as the collisions of black holes. Joining the search will be Virgo, the gravitational-wave detector located at the European Gravitational Observatory (EGO) in Italy, which has almost doubled its sensitivity since its last run and is also starting up April 1. So far LIGO and Virgo have seen ten binary black holes and one binary neutron star. In O3, the researchers are hoping to detect gravitational wave signals from new types of events such as binaries containing both a neutron star and a black hole or continuous gravitational waves from rotating neutron stars.
ARC Linkage Grant Awarded to Test and Review the Success of Teaching Einstein’s Theories
Prof. Susan Scott is among the leaders of a group of Gravitational Wave researchers who are granted $898,560 ARC Linkage funding, announced by the Minister for Education Dan Tehan on March 19th. This project aims to explore teaching the modern Einsteinian paradigm of space, time, matter, light and gravity to students as young as 8 years old. The Einstein First project will focus on testing and evaluating a seamless progression of learning modern physics through primary and secondary school developed through a 7-nation collaboration, with view to worldwide introduction of Einsteinian science at school. The research will be led by Chief Investigator Emeritus Professor David Blair (UWA), Professor Susan Scott (ANU) and collaborators.
Biggest Known Black Hole Collision detected
CGP physicists in RSPE have celebrated the announcement by LIGO & Virgo & OzGrav (ARC Centre of Excellence) of 4 new binary black hole collisions including the biggest, fastest spinning and furthest merger ever recorded. All four newly confirmed black hole coalescences were found in the archived data from the observing run in 2017, coming to light as a result of further data cleaning and recalibration and refinement of the searches. A description of these detections has been released as part of the catalogue of detections by the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO) in the US and the Advanced Virgo facility in Italy. The newly announced detections bring the total number of black hole mergers detected to 10 – plus a single binary neutron star merger – over the past three years.
The 2018 Quantum Communication Awarded to the Leader of CGP
Prof David McClelland received the International Organisation for Quantum Communication, Measurement and Computing Award for Outstanding Achievements in Quantum Experimentation. In bestowing McClelland with this award, the organisation cited his “pioneering experimental work and leadership in the development of squeezed vacuum light sources in the audio-band and its successful application to the gravitational wave detector interferometers GEO and LIGO.” The award was shared in equal parts with OzGrav Partner Investigator Prof Nergis Mavalvala (MIT) and Prof Roman Schnabel (Hamburg).
Walter Boas Medal Awarded to the Leader of CGP
Professor David McClelland has been awarded the prestigious Boas medal, by the Australian Institute of Physics, "for key contributions to one of the greatest achievements in the history of physics – the observation of gravitational waves by the Laser Interferometer Gravitational-wave Observatory (LIGO).
Gravitational waves detected for first time from two stars colliding
Scientists from The Australian National University (ANU) and around the world have detected for the first time ripples in space and time, known as gravitational waves, from the collision of two very dense stars, called neutron stars, about 130 million light years away.
Third gravitational wave detection offers new insight into black holes
We detected a third binary black hole merger with the LIGO gravitational wave detectors. The black holes merged about 3 billion years ago and travelled through earth on 4 January 2017. The detection is published in Physical Review Letters, a science summary can be found on the LIGO website. Members of the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) are part of the LIGO Scientific Collaboration.
ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav)
The CGP is the ANU node of the recently awarded ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav). The Centre brings together the Australian gravitational wave community from pulsar-timing to the terrestrial and space based interferometer detectors. OzGrav is a partnership between Swinburne University (host of OzGrav headquarters), the Australian National University, Monash University, University of Adelaide, University of Melbourne, and University of Western Australia, along with other collaborating organisations in Australia and overseas.
Again! Second set of merging black holes found
A second binary black hole merger has been found by LIGO, cementing the new field of gravitational wave astronomy. The paper describing the discovery is published in Physical Review Letters and a science summary can be found on the LIGO website.
We did it! Gravitational waves detected
The LIGO Scientific Collaboration has successfully detected gravitational waves from a pair of colliding black holes
For enquires about the group and our research please contact the head of the group, Professor David McClelland.
Phone: +61 (0)2 6125 2747 (Secretary)
Fax: +61 (0)2 6125 0741