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Professor Nicholas Lockerbie

Research Professor

Physics

Publications

GW170817 : Observation of gravitational waves from a binary neutron star inspiral
Abbott B. P., Birney R., Jawahar S., Lockerbie N. A., Reid S., Tokmakov K. V., null null, null null
Phys. Rev. Lett. Vol 119, (2017)
http://dx.doi.org/10.1103/PhysRevLett.119.161101
GW170814 : a three-detector observation of gravitational waves from a binary black hole coalescence
Abbott B. P., Jawahar S., Lockerbie N. A., Tokmakov K. V., null null, null null
Phys. Rev. Lett. Vol 119, (2017)
http://dx.doi.org/10.1103/PhysRevLett.119.141101
Upper limits on gravitational waves from Scorpius X-1 from a model-based cross-correlation search in Advanced LIGO data
Abbott B. P., Jawahar S., Lockerbie N. A., Tokmakov K. V., null null, null null
Astrophysical Journal Vol 847, (2017)
http://dx.doi.org/10.3847/1538-4357/aa86f0
Search for high-energy neutrinos from gravitational wave event GW151226 and candidate LVT151012 with ANTARES and IceCube
Abbott B. P., Jawahar S., Lockerbie N. A., Tokmakov K. V., null null, null null, null null, null null
Physical Reveiw D: Particles, Fields, Gravitation & Cosmology Vol 96, (2017)
http://dx.doi.org/10.1103/PhysRevD.96.022005
Search for intermediate mass black hole binaries in the first observing run of Advanced LIGO
Abbott B. P., Jawahar S., Lockerbie N. A., Tokmakov K. V., null null, null null
Physical Reveiw D: Particles, Fields, Gravitation & Cosmology Vol 96, (2017)
http://dx.doi.org/10.1103/PhysRevD.96.022001
Search for gravitational waves from Scorpius X-1 in the first Advanced LIGO observing run with a hidden Markov model
Abbott B. P., Jawahar S., Lockerbie N. A., Tokmakov K. V., null null, null null
Physical Reveiw D: Particles, Fields, Gravitation & Cosmology Vol 95, (2017)
http://dx.doi.org/10.1103/PhysRevD.95.122003

more publications

Professional activities

External PhD examiner - Uni Birmingham (2011)
External Examiner
2011
External PhD examiner - Uni Western Australia (2009)
External Examiner
2009
STFC (External organisation)
Chair
2007
External PhD examiner - OBSERVATOIRE DE PARIS (2007)
External Examiner
2007
External PhD examiner - Uni Glasgow (2006)
External Examiner
2006
University of Glasgow (External organisation)
Advisor
2005

more professional activities

Projects

X-ray production and imaging using ultra intense lasers | Jawahar, Sharat
Lockerbie, Nicholas (Principal Investigator) Riis, Erling (Co-investigator) Jawahar, Sharat (Research Co-investigator)
Period 01-Nov-2012 - 01-Mar-2016
Gravity Gradiometry
Lockerbie, Nicholas (Principal Investigator)
Period 01-Jul-2016 - 31-Oct-2016
QUOTA STUDENTSHIP 2012 | Jawahar, Sharat
Lockerbie, Nicholas (Principal Investigator) Riis, Erling (Co-investigator) Jawahar, Sharat (Research Co-investigator)
Period 01-Nov-2012 - 01-Mar-2016
Investigations in Gravitational Radiation
Lockerbie, Nicholas (Principal Investigator)
"Einstein's General Relativity predicts that dynamical systems in strong gravitational fields will emit vast amounts of energy in the form of gravitational waves (GW). These are ripples in the very fabric of spacetime that travel from their sources at the speed of light, carrying information about physical processes responsible for their emission. They are among the most elusive signals from the deepest reaches in the Universe. Experiments aimed at detecting them have been in development for several decades, and are now reaching sensitivities where detection is expected within a few years.
The worldwide network of interferometric detectors includes the American advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), the French-Italian-Dutch-Polish advanced Virgo and the German-UK GEO600 that are being enhanced with a new detector (KAGRA) under construction in Japan. The former detectors have all reached sensitivities close to their design goals and have taken the most sensitive data to date. Cooperation amongst different projects has enabled continuous data acquisition, with sensitivity to a wide range of sources and phenomena, over most of the sky. Modelling GW sources has allowed deeper searches and data from LIGO, Virgo, and GEO have increased our understanding of astronomical phenomena. For example, we have built accurate models to describe the dynamics of spinning black hole binaries for improving efficiency of detection and accuracy of parameter estimation, initiated studies on distinguishing models of the formation and evolution of compact binaries and supernovae, ruled out merging neutron star binary as progenitor of the gamma ray burst (GRB) GRB070201, and shown that less than 1% of the Crab pulsar's radiated power is in GW.
We are now entering a new era as advanced detectors begin their first phase of operation and within a few years will, we expect, routinely observe GW. The aLIGO detectors are based on the quasi-monolithic silica suspension concept developed in the UK for GEO600 and on the high power lasers developed by our German colleagues in GEO600. The AdV detector also uses a variant of the silica suspension technology. Further, KAGRA is being built with input on cryogenic bonding technology from the UK groups.
The consortium groups have initiated and led searches for astronomical sources, thanks to funding support received since first data taking runs began 12 years ago. Key ingredients of several searches (accurate waveforms models, geometric formulation of data analysis to optimise searches, algorithms to search for generic bursts, Bayesian search and inference techniques) were developed at Cardiff and Glasgow.
We propose a programme that leads to full exploitation of data from aLIGO and AdV, building on the analysis of data from the most recent LIGO/Virgo science runs and from GEO600 while the advanced detectors were under construction. In particular, we will refine waveform models and carry out deep and wide parameter space searches for coalescing binaries, GW emitted in coincidence with GRBs and supernovae, and continuous signals from rotating neutron stars.
In parallel, we propose essential detector. Detector sensitivity is mainly limited by thermal noise associated with the substrates of the mirrors, their reflective coatings, and their suspension elements, as well as by noise resulting from the quantum nature of the light used in sensing. Our research is targeted towards making innovative improvements in these areas, essential to maximize the astrophysical potential of GW observatories. We have major responsibilities for the silica suspensions in aLIGO, both in the US and for a possible 3rd aLIGO detector in India, and in the development of enhancements and upgrades to the aLIGO detectors in the areas of mirror coatings for low thermal noise, silicon substrates, room temperature and cryogenic suspensions and improved interferometer topologies to combat quantum noise."
Period 01-Oct-2016 - 30-Sep-2020
Investigations in Gravitational Radiation
Lockerbie, Nicholas (Principal Investigator)
"Einstein's General Theory of Relativity (GR) predicts that dynamical systems in strong gravitational fields will release vast amounts of energy in the form of gravitational radiation. Gravitational waves are ripples in the fabric of spacetime and travel from their sources at the speed of light, carrying information about physical processes responsible for their emission, obtainable in no other way. They are among the most elusive signals from the deepest reaches in the Universe. Experiments aimed at detecting them have been in development for several decades, and are now reaching sensitivity levels where detection is expected within a few years.

The worldwide network of interferometric detectors includes the German-UK GEO600, the French-Italian Virgo, the American Laser Interferometer Gravitational-Wave Observatory (LIGO) and is being enhanced with a new detector under construction - KAGRA in Japan. The former detectors have all reached sensitivities close to their design goals and have taken the most sensitive data to date. Cooperation amongst different projects enables continuous data acquisition, with sensitivity to a wide range of sources and phenomena, over most of the sky.

Data from GEO, LIGO and Virgo, have already increased our understanding of astronomical phenomena. Search for gravitational waves at the times of 154 gamma-ray bursts has allowed the best ever exclusion distances and provided evidence for extra-Galactic sources of soft-gamma repeaters. The distance reach for binary black holes in the most recent runs is 300 Mpc and the rate upper limits are now very close to that expected in some of the astrophysical models. The search for gravitational waves from the Vela pulsar has set an upper bound on the strength of radiation that is significantly below that expected from the observed spin down rate of the pulsar, corresponding to a limit on the star's ellipticity of a part in a thousand.

While recent and current observations may produce detections, there can be no guarantees. However, there is great confidence that the advanced detectors currently in construction will routinely observe gravitational waves. The advanced LIGO detectors are based on the quasi-monolithic silica suspension concept developed in the UK for GEO 600 and on the high power lasers developed by our German colleagues in GEO 600. The Advanced Virgo detector also uses a variant of the silica suspension technology. The Cardiff and Glasgow groups have initiated and led searches for astronomical sources, thanks to the algorithmic and analysis effort that has been supported since the first data taking runs began eight years ago.

We propose a programme that leads to full exploitation of data from Advanced LIGO (aLIGO), building on both continuing operation of GEO600 and analysis of data taken in the most recent LIGO/Virgo science runs. In particular we will model binary black hole mergers and carry out deep searches for:
* Coalescing binary neutron stars, neutron star-black hole binaries, and black hole binaries,
* Bursts of gravitational waves that may originate from supernovae,
* Continuous signals from pulsars and other rotating neutron stars,
* Gravitational waves detected by cross-correlation methods, including a cosmological background.

In parallel, we propose detector research and development. Detector sensitivity is mainly limited by thermal noise associated with the substrates of the mirrors, their reflective coatings, and their suspension elements, as well as by noise resulting from the quantum nature of the light used in sensing. Our research is targeted towards making innovative improvements in these areas. We have major responsibilities for the silica suspensions in aLIGO, and in the development of enhancements and upgrades to the aLIGO detectors, in the areas of mirror coatings for low thermal noise, silicon substrates, cryogenic suspensions and improved interferometer topologies to combat quantum noise."
Period 01-Oct-2013 - 30-Sep-2017
Development Of A Downhole Gravity Gradiometer (AMADEUS)
Lockerbie, Nicholas (Principal Investigator)
Period 01-May-2013 - 30-Apr-2016

more projects