Professional Profiles

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Current appointments

Graduate Research Associate, Geodesy and Geodynamics Lab, 2024–Present 

Graduate Teaching Associate, Geostatistics (EARTHSC 5641) & Introductory Earth Science Laboratory (ES 1200), 2023

Research interests

My research lies at the intersection of mathematical geodesy, gravitational physics, and computational mathematics. I study the mathematical structure of gravitational fields generated by finite and irregular bodies and develop analytical and numerical methods for evaluating gravitational potential, acceleration, and gravity-gradient tensors. A central focus of my work is the derivation of exact and high-precision formulations for polyhedral geometries, drawing on potential theory, geometry, vector analysis, and numerical computation, with applications to terrestrial, lunar, and planetary geodesy and celestial mechanics.

Research software

Python, MATLAB, and Julia implementations associated with my recent publications on gravitational potential and field modeling are available on my GitHub repository.

Honors and awards

Kaarina and Weikko A. Heiskanen Junior Student Award, 2026

Fulbright Scholar, Sri Lanka–USA, Master’s Award, 2021–2023

George Herat Memorial Gold Medal, Best Performance in Geodesy, 2019

Best Poster Presentation Award, Sabaragamuwa University of Sri Lanka, 2018

Presidential and National Award for Invention, Sri Lanka, 2008

Publications

Periyandy, T., and Bevis, M. (2026). The Gravitational Field of a Homogeneous Polygon. Mathematical Geosciences. https://doi.org/10.1007/s11004-026-10325-6 

Periyandy, T., and Bevis, M. (2026). Analytical Solutions for the Internal and External Gravitation of a Homogeneous Cuboid. Journal of Geodetic Science. https://doi.org/10.1515/jogs-2025-0193 

Periyandy, T., and Bevis, M. (2026). The Gravitational Field of a Homogeneous Polyhedron. Celestial Mechanics and Dynamical Astronomy. https://doi.org/10.1007/s10569-026-10302-5 

Periyandy, T., and Bevis, M. (2025). The Gravitational Potential Inside, On and Outside of a Homogeneous Tetrahedron. Journal of Geodesy. https://doi.org/10.1007/s00190-025-02024-7 

Periyandy, T., and Bevis, M. (2025). A Generalized Algorithm for the Gravitational Potential of a Homogeneous Cuboid. Physics International. https://doi.org/10.3844/pisp.2025.7.17 

Edirisinghe, D. U., Welikanna, D. R., Periyandy, T., and Bandara, R. (2024). Development of a Hybrid Geoid Model Using a Global Gravity Field Model over Sri Lanka. Journal of Applied Geodesy. https://doi.org/10.1515/jag-2023-0092 

Presentations & scientific conferences

Periyandy, T., and Bevis, M. (2025). “Generalized Solutions for the Gravitational Potential of Constant-Density Polyhedra.” AGU Fall Meeting 2025, New Orleans, Louisiana, USA.

Periyandy, T., Welikanna, D. R., and Shum, C. K. (2024). “Improving the Spatial Resolution of GRACE Data for Localized Studies: A Case Study on Sri Lanka Using a Moving Window Ratio Algorithm.” IAG – Gravity, Geoid, and Height Systems 2024, Thessaloniki, Greece.

Periyandy, T. (2023). “Areas of Same Cardinal Direction.” University of Maine Student Symposium (UMSS 2023), Bangor, Maine, USA.

Periyandy, T. (2021). “Impact of Weak Gravitational Force in Sri Lanka.” International Programs, English Language Institute, Syracuse University.

Periyandy, T., Welikanna, D. R., and Prasanna, H. M. I. (2021). “A Geometrical Perspective of the Elliptical Movement of the Planets – A Consequence of Two Circular Forces Directed Towards the Foci.” 8th International Conference of Sabaragamuwa University of Sri Lanka.