Stony Brook University Professor Neelima Sehgal was recently named a 2025 American Physical Society (APS) Fellow.

The APS Fellowship recognizes members for their outstanding efforts to advance physics. Members are inducted based on their contributions to original research and publication, significant innovative contributions in the application of physics to science and technology, remarkable advancements in the teaching of physics, and exemplary service and participation in APS activities.

"I am deeply grateful for this recognition from my APS colleagues, and delighted to join the distinguished group of Stony Brook Physics and Astronomy faculty who are APS fellows," said Sehgal, professor of Physics and Astronomy in Stony Brook's College of Arts and Sciences.

Sehgal is a theoretical and observational cosmologist. Her research involves understanding the fundamental physics of the Universe, including dark matter, dark energy, the origin of the Universe, and the Universe's particle inventory. Her main tool to do this is to use observations of the Cosmic Microwave Background (CMB), which is the oldest light in the Universe coming to us from almost 14 billion years ago. For two decades, she analyzed CMB data from the Atacama Cosmology Telescope, which was located in the Atacama Desert in Chile.

Sehgal is now involved with the Simons Observatory, which will take data for another decade. She is also is the Principal Investigator of the CMB-HD experiment, a proposed next-generation, high-resolution CMB observatory. CMB-HD is designed to map the dark matter in the Universe on small scales, probe the origin of the Universe, and definitively determine the Universe's thermal particle content.

"My sincere congratulations to Professor Neelima Sehgal on this truly significant achievement," said David Wrobel, dean of the College of Arts and Sciences. "Her pioneering work on a cosmic microwave background observatory is pivotal in expanding our understanding of the fundamental physics of the Universe. We are fortunate and proud to have such an exceptional theoretical and observational cosmologist working to advance our university and the frontiers of science."