[2] She also did post-doctoral research at the University of Cambridge as part of the Centre for Theoretical Cosmology run by physicist Stephen Hawking.
[1] Weltman became known when she co-authored a 2004 paper titled "Chameleon Cosmology" with Justin Khoury, which proposed a theory to explain dark energy.
In 2007 Weltman joined an experimental team at Fermilab on the GammeV experiment which has been designed to search for axion like particles.
[11] The theory evolved by Khoury and Weltman has been described as leading to "entire sub-fields in cosmology and experimental physics."
[13] Among her many other major contributions to FRB physics she has proposed a novel test of a model of FRBs as a result of the Gertsenshtein-Zeldovich (GZ) effect which describes how a gravitational wave passing through a pulsar magnetosphere can be (partially) converted into electromagnetic radiation.
Weltman is playing a leading role in the Hydrogen Intensity and Real-time Analysis eXperiment (HIRAX) currently under construction in South Africa.
She has written a number of articles for the public,[14][15] for Nature News and Reviews[16] and has given interviews on a range of topics related to science, cosmology and astrophysics for assorted print media.
Weltman has served the science community, especially in South Africa, through leadership roles on national boards and academies.