Research
My primary research interests are in the multimessenger astrophysics of compact objects. In particular, I am interested and the use of these systems to explore deep questions in fundamental physics (e.g. strongfield general relativity) and astrophysics.


Gravitational Burst Radiation from Pulsars in the Galactic centre and stellar clusters
Tom Kimpson, Kinwah Wu, Silvia Zane
MNRAS, 2020
arxiv /
doi /
Can we do multimessenger astronomy of strongfield regimes? Can pulsar observations act as a prior for GW astronomy?


Prospects for Fundamental Physics with LISA
Barausse et al., including Tom Kimpson
eprint, 2020
arxiv /
Exploring the potential of the Laser Interferometer Space Antenna (LISA) for probing fundamental physics.


Pulsar timing in extreme mass ratio binaries: a general relativistic approach
Tom Kimpson, Kinwah Wu, Silvia Zane
MNRAS, 2020
arxiv /
doi /
Initial steps on computationally modelling the timefrequency signal from PSRBH systems. Such a framework is necessary to both inform the detection of a PSRBH system and to use these systems for tests of fundamental physics and astrophysics.


Spatial dispersion of light rays propagating through a plasma in Kerr spacetime
Tom Kimpson, Kinwah Wu, Silvia Zane
MNRAS, 2019
arxiv /
doi /
How does light propagate through a plasma on a background Kerr spacetime? We show that the convolution of gravitational and plasma effects gives rise to a dispersion in both space and time, and discuss implications for the detection of gravitationally bent pulsar beams near the Galactic centre


Hierarchical black hole triples in young star clusters: impact of KozaiLidov resonance on mergers
Tom Kimpson, Mario Spera, Michela Mapelli, Brunetto Ziosi
MNRAS, 2016
arxiv /
doi /
Mergers of compact object binaries are one of the most powerful sources of gravitational waves (GWs) in the frequency range of secondgeneration groundbased gravitational wave detectors. WE perform NBody simulations of young dense star clusters (with a new code based on the Mikkola’s algorithmic regularization scheme, including the 2.5 postNewtonian term) to explore the formation of hierarchical triples and the effects of KozaiLidov (KL) resonances on the merger rate, with implications for GW events

Code
Throughout my research I have written a number of scientific codes, typically relating to timefrequency modelling and signal analysis of nonlinear, dynamical astrophysical systems. In order to enable reproducible research I am attempting to make all codes associated with published papers publicly available with documentation. This endeavour is currently a work in progress!


Ray Tracing in Kerr Spacetime
code /
What is the path of light through a curved spacetime? Includes gravitational lensing, gravitational and relativistic time dilation, chromatic effects (dispersion in time/space) , blackbox optimisation methods for constructing a consistent timefrequency signal.


SpinCurvature dynamics
code /
Numerical solution to the spinorbital dynamics of an extended spinning object around a Kerr black hole, accounting for spinspin, spinorbit and spincurvature coupling.

Talks
 Fundamental Physics with MSPBH Systems. Perimeter Institute Strong Gravity Group meeting, Canada. Jan 2019.
 Multimessenger astrophysics of Pulsar EMRBs. 22nd International Conference on General Relativity and Gravitation, Valencia. July 2019.
 Pulsar Timing in Extreme Mass Ratio Binaries. National Astronomy Meeting, Lancaster. July 2019.
 Fundamental physics with pulsars . GW@UCL, London. June 2019.
 Pulsars as probes of strongfield GR. Science Possibilities Investigating Neutron Stars, London. May 2019.
 General Relativistic Pulsar Timing . Mullard Space Science Laboratory, London. Jan 2019.
 Spatial dispersion in the strongfield: Implications for PSR timing. INAF Cagliari, Italy. March 2018.
 Modeling in the gravitational strong field (poster) . Computational Sciences in the 21st Century, London. June 2019.

