Most of the energy and matter content is invisible and so far seems to manifest itself gravitationally.  The Dark energy makes the expansion rate of the universe accelerate and the dark matter keeps our galaxy and others, happily as long lived bound states.  The physics community have been on a search both theoretically and experimentally to identify the identity of the dark energy and matter.  So far most of our physics have been explained and predicted by our standard model of elementary particle interactions and Einstein's theory of General Relativity with breath taking precisions. Lurking behind the issues presented by the dark sector is the fact that both general relatiity and the standard model are incomplete theories, fraught with singluarities and instabilities.  Its is the goal of my research group to find the completion of the standard model and genral relativity keeping these issues, both theoretically and observationally in mind.  Our group addfresses these problems with a diverse arsenal of theoretical, computational (ie machine learning) and conceptual tools.  

For more information consult my research lab page:  https://www.stephonalexanderlab.com/

NSF CAREER AWARD

APS E. Bouchet Award

AAAS John Wesley Powell Memorial Award

Trinidad and Tobago, NIHERST National Medal of Science

Member of Center for Fundamental Theory at Penn State  http://cft.igc.psu.edu/research/

Member of Fundamental Questions Institite