Christopher Stubbs

Christopher Stubbs Christopher William Stubbs (born March 12, 1958) is an American Experimental physics experimental physicist, known for his research on astroparticle physics, cosmology, and gravitation. He was elected in 1999 a Fellow of the American Physical Society. He was a member of the High-z Supernova Search Team; the team shared in 2007, with others, the Gruber Prize in Cosmology and shared in 2015, with others, the Breakthrough Prize in Fundamental Physics. Quotes Much of the mass of the Universe is thought to reside in some as yet unidentified dark matter. This view is based on the analysis of trajectories of luminous ‘‘tracers’’ that map out the local potential, assuming that gravity is the only long ranged interaction between ordinary and dark matter. This assumption should be tested experimentally if possible. Laboratory tests of the Equivalence principle#Weak equivalence principle weak equivalence principle can constrain (at an interesting level) any exotic coupling between ordinary and dark matter when analyzed as a test of the uniformity of free fall towards the center of the Galaxy. 1993 Experimental limits on any long range nongravitational interaction between dark matter and ordinary matter Physical Review Letters 70 2 119–122 https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.70.119 10.1103/PhysRevLett.70.119 In my opinion the Dark energy Dark Energy situation constitutes a crisis in fundamental physics that is every bit as profound as that which preceded the advent of quantum mechanics. ...Today, in the absence of a clear theoretical framework with relevant predictive power, the Dark Energy problem is best characterized as a data and discovery driven endeavor, spiced with interesting theoretical speculation. Addressing the Crisis in Fundamental Physics arXiv.org 2007 https://arxiv.org/pdf/0712.2876 1–11 (quote from pp. 4–5) Ground-based Optical telescope optical and infrared telescopes suffer from sources of image quality degradation that typically preclude achieving the Diffraction-limited system diffraction limit of 𝜃 ∼ 𝜆/𝐷. For 𝐷=10 m class telescopes at optical wavelengths (𝜆 ∼500Nanometre nm), the typical achieved Full width at half maximum FWHM of around 1 Minute and second of arc arcsec for a celestial point source (absent adaptive optics correction) is about 100 times worse than the diffraction limit.A variety of factors contribute to this image degradation, including:• index of refraction variations in the upper atmosphere,• “ground layer” or “boundary layer” turbulence due to the boundary condition of zero wind velocity at the Earth’s surface,• perturbations to Laminar flow laminar airflow due to local topography and structures,• turbulence within the enclosure, due to ambient and driven airflow through the slit and vents in the dome,• thermally driven air currents due to power dissipation on the telescope top end, and other locations,• turbulence and thermal currents in the vicinity of the primary mirror due to temperature differences between the mirror and the adjacent air,• tracking errors and vibrations in the Mirror support cell mirror support systems,• wind-driven oscillations and motions of the mirror support systems, and• quasi-static optical aberrations in the optical system. 2021 Strobed Imaging as a Method for the Determination and Diagnosis of Local Seeing arXiv.org https://arxiv.org/abs/2106.10593 1–6 (quote from p. 1) So when I finished my Ph.D., in retrospect it's kind of hard to believe that I had the audacity to do what I am about to describe. But I sort of looked around and asked myself, "What's the most interesting remaining List of unsolved problems in physics open question in fundamental physics, and where can I go to work on it?" ... the dark matter problem ... Progress, Potential, and Possibilities, YouTube Dr. Christopher Stubbs, Ph.D. - Harvard - Big Projects To Solve Pressing Issues In Science January 28, 2025 https://www.youtube.com/watch?v=hpekynmML5w&t=562s (quote at 9:22 of 1:01:17 in video) External links Going Big: A Scientist's Guide to Large Projects and Collaborations by Christopher W. Stubbs 2024 MIT Press Direct 10.7551/mitpress/15001.001.0001 9780262378482 https://direct.mit.edu/books/oa-monograph/5750/Going-BigA-Scientist-s-Guide-to-Large-Projects-and Category:1958 births Category:Living people Category:Physicists from the United States Category:Harvard University faculty