 He has shown (with Savvidy) the exponential instability (chaos) in spherical stellar systems and has derived the collective relaxation time.He has formulated a list of 10 key problems in stellar dynamics 


Cosmic microwave background indications for voids - large scale underdense regions - were obtained by Gurzadyan et al., including on the void nature of the Cold Spot, confirmed by independent galaxy survey, as of possibly largest known structure in the Universe.Gurzadyan has suggested and initiated the use of Compton Edge method for high accuracy testing of the light speed isotropy and the Lorentz invariance at GRAAL experiment in European Synchrotron Radiation Facility (Grenoble); the obtained limit became a reference number for Special Relativity extension models.