Simulation-based Inference of Gravitational Waves Signals from Black Holes and Neutron Stars
This PhD project at Cardiff University focuses on simulation-based inference of gravitational wave signals originating from black holes and neutron stars, the densest and most enigmatic objects in the universe. When these objects collide, they produce gravitational waves—ripples in spacetime detected for the first time in 2015 by the LIGO-Virgo collaboration. Since then, hundreds of such events have been observed, allowing scientists to characterize the sources and probe the fundamental laws of physics. Current characterization methods rely on computationally intensive stochastic sampling and simplified detector models. This project aims to revolutionize the field by applying modern likelihood-free inference techniques, specifically simulation-based inference, to improve accuracy and efficiency. The approach will dynamically adapt to detector noise and incorporate new data, making it suitable for next-generation gravitational-wave detectors. Properly characterizing these sources enables measurement of the equation of state of matter at extreme densities and tests General Relativity in strong-field regimes. The project also seeks to infer the extragalactic population of gravitational-wave sources, offering insights into the universe's structure and expansion. The research is highly interdisciplinary, involving data science, machine learning, applied statistics, astronomy, astrophysics, and computational physics. The position is fully funded by the Science and Technology Facilities Council (STFC) for 3.5 years, covering tuition, a UKRI standard stipend (£20,780 for 2025/26), and additional support for training, research, and conferences. The studentship is open to UK/home and international candidates, with no fee difference for international students. Applicants should have or expect a first-class or good 2.1 degree in Engineering, Physics, or a related field, and possess desirable skills in quantum physics, optics, semiconductors, technology, and engineering. English language proficiency is required (IELTS 6.5 overall, minimum 5.5 in sub-scores). The application process involves submitting an academic CV, degree certificates and transcripts, a personal statement (max 500 words), and two references (preferably a third if both are from the same department) via the Cardiff University postgraduate portal. The School of Physics and Astronomy is committed to equality, diversity, and flexible working arrangements, welcoming applications from underrepresented groups and those wishing to work part-time or full-time. Applications may be submitted in Welsh or English. The deadline for applications is January 9, 2026.
