Cosmin Ilie

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Cosmin Ilie

Senior Lecturer in Physics and Astronomy

Department/Office Information

Physics and Astronomy
410 Ho Science Center
  • M 1:30pm - 3:00pm (Zoom )
  • W 2:00pm - 3:30pm (Zoom)


I use computational methods, data analysis, and forecasting techniques to connect experiments and theory in cosmology. My work focuses primarily on Dark Matter and its potential observable signatures. For example, I have explored how Dark Matter affects the formation of the first stars in the Universe. One of the most striking consequences we find is that they can become as massive as a million suns. Those enormously bright objects, formed during the cosmic dawn era, could potentially be detected by the James Webb Space telescope. My collaborative work on this subject has been published in multiple peer-reviewed journals and was popularized in magazines such as New Scientist, Sky and Telescope, Scientific American, and Astronomy Magazine. 

Current research interests, in addition to those listed above, include the exploration of Dark Matter in non standard cosmological histories,  and the effects Dark Matter captured by compact astrophysical objects has on their evolution.   

Ph.D., University of Michigan, 2011

C. Ilie, and S. Zhang.* Multiscatter capture of superheavy Dark Matter by Pop.III stars. 2019.

 Journal of Cosmology and Astroparticle Physics 12, 51


C. Ilie. Gamma Ray polarimetry; a new window for the non-thermal Universe. 2019. Publications of the Astronomical Society of the Pacific 131, 1005


M. Eingorn, L. Fernando, B. Vlahovic, C. Ilie, B. Wojtsekhowski, G.M. Urciuoli, F. De Persio, F. Meddi. A High Energy Photon Polarimeter for Astrophysics. 2018. Journal of Astronomical Telescopes, Instruments, and Systems 4(1), 011006


I. Waldstein, A. Erickcek, and C. Ilie. A Quasi-Decoupled State for Dark Matter in Non-

Standard Thermal Histories. 2017. Physical Review  D 95


B. Vlahovic, M. Eigenhorn, and C. Ilie. Uniformity of CMB as a non-Inflationary Geometrical Effect. 2015. Modern Physics Letters A 30 1530026


C. Ilie, K. Freese, M. Valluri, I.T. Iliev, P. Shapiro. Observing Supermassive Dark Stars with James Webb Space Telescope. 2012. Monthly Notices of the Royal Astronomical Society 422, 2164


C. Ilie, K. Freese, and D. Spolyar. Dark Stars and Boosted Dark Matter Annihilation Rates. 2011. New Journal of Physics, 13 053050


K. Freese, E. Ruiz, M. Valluri, C. Ilie, D. Spolyar, P. Bodenheimer. Supermassive Dark Stars: Detectable in JWST and HST. 2010. AIP Conf. Proc. 1294


K. Freese, C. Ilie, D. Spolyar, M. Valluri, P. Bodenheimer. Supermassive Dark Stars: Detectable in JWST. 2010. The Astrophysical Journal 716 (2).


C. Ilie, T. Biswas, and K. Freese. Are we seeing the beginnings of Inflation? 2009. Physical Review D 80, 103521


*Colgate University, Undergraduate Class of 2019

PHYS 112 Fundamental Physics II 

PHYS 131 Atoms and Waves 

PHYS 232 Introduction to Mechanics 

PHYS 410 Advanced Topics and Experiments 

PHYS 414 Astrophysics 

PHYS 432 Electrodynamics 

PHYS 410 Classical Mechanics 

PHYS 456 General Relativity and Cosmology