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    I am an astronomer, cosmologist, and data scientist. I am currently a NSF funded Assistant Research Scientist at the UC San Diego Center for Astrophysics & Space Sciences (CASS profile) and a Research Affiliate in the MIT Program in Science, Technology and Society (STS). I work on several theoretical and observational cosmology projects to devise and implement fun experiments that leverage cosmology to help test fundamental physics. These include a series of experiments with colleagues to test quantum theory with astronomical observations as well as Infrared and Optical observations of Type Ia Supernovae with ground and space based telescopes, which can be used to measure the expansion history of the universe, cosmic acceleration, and dark energy. Before UCSD, I was an NSF Postdoctoral Fellow at MIT, a NSF Funded Research Associate at MIT, and a Visiting Research Scientist at the MIT Center for Theoretical Physics. I completed my PhD in Astronomy & Astrophysics from the Harvard University Department of Astronomy and I received my BA in Physics & Astrophysics from UC Berkeley. I am very interested in projects at the intersection between observational astronomy, astrophysics, data analysis, and the philosophy of science, especially the philosophy of cosmology. I am excited to explore a range of fascinating scientific questions through research, science writing, art, animation, public outreach, and working with the science media. For more, see my Bio, Resume, and CV.
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(a) Animation 5a corresponds to Fig. 2a of Friedman+2013 for the case in which the event redshifts are fixed to zA=5 and zB=3.65, while the angular separation α as seen from Earth is allowed to vary from 0 to 360 degrees (or, without loss of generality, 0 < α < 180 degrees by symmetry about the x-axis). As in Animation 4, the green circles show the projection of the past lightcones on the hypersurface τ=τAB when the lightcones first intersect; these are also shown as black circles projected onto the τ=0 plane. For these redshifts, events A and B have a shared causal past for angles below some critical value (α <= α) but do not for angles greater than that value (α > α), where α is found from Eq.~31 of Friedman+2013. The movie represents a point in the zA - zB plane which lies in the white box in the upper right region of Fig 3b of Friedman+2013, where event pairs do not have a shared causal past with each other as long as the angular separation α exceeds some critical angle α. Since zA > 3.65 for any angle α, event A also does not have a shared causal past with our worldline along the τ-axis from the origin. Since zB=3.65, event B just barely has a shared past with our worldline for all angles α.

(b) Animation 5b for the same case as in Animation 5a, as viewed in the τ=0plane at the big bang.

University of California, San Diego UCSD Center for Astrophysics & Space Sciences Massachusetts Institute of Technology MIT Center for Theoretical Physics Institute for Quantum Optics and Quantum Information, Vienna Harvard University Astronomy Harvard-Smithsonian Center for Astrophysics UC Berkeley Astronomy National Science Foundation National Aernautics & Space Administration
Last Updated: Andrew Samuel Friedman, 2/2017

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This material is based upon work supported by the National Science Foundation under NSF Award #1056580 (2012-2014) through an NSF Science, Technology, and Society Postdoctoral Fellowship at MIT and the NSF INSPIRE program via NSF Award #1541160 (2015-2018).

Original animations are shared under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 US License