Bulletin of the American Physical Society
2016 Fall Meeting of the APS New England Section
Volume 61, Number 11
Friday–Saturday, October 28–29, 2016; North Adams, Massachusetts
Session E1: Parallel Session A |
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Chair: Emily Maher, MCLA Room: Murdock Hall 201 |
Saturday, October 29, 2016 9:00AM - 9:15AM |
E1.00001: First Measurement of Z+$\gamma$ Production in 13-TeV Proton-Proton Collisions Emily Stump, Alfred Goshaw, Andrea Bocci This initial study of $Z(\mu^{+}\mu^{-} )\gamma$ events from proton-proton collisions at 13 TeV compares this new data to Standard-Model (SM) predictions, as well as searches for evidence of beyond-the-Standard-Model (BSM) processes. It was found that the data generally agree with SM predictions, with no evidence for BSM physics. [Preview Abstract] |
Saturday, October 29, 2016 9:15AM - 9:30AM |
E1.00002: Bootstrapping models of Lorentz-violating gravity Michael Seifert Over the past few years, the Standard Model Extension (SME) has emerged as a notable effort to describe and parametrize possible breakings of Lorentz symmetry. Most work on gravity within this program thus far has focused on the linearized limit; one of the major challenges currently facing this program is to find a self-consistent non-linear model of gravitational dynamics. I will discuss my recent progress towards parameterizing the possible behaviors of linearized gravity models where Lorentz symmetry is broken, and then "bootstrapping" these models to full non-linear models. I will show that the range of possible models at linear level is quite limited; however, the allowed linear models can be extended to non-linear models in a straightforward manner. [Preview Abstract] |
Saturday, October 29, 2016 9:30AM - 9:45AM |
E1.00003: Electromagnetism in a gravity field for the quaternion gravity proposal Doug Sweetser Gravity effects everything, almost. The electromagnetic field strength tensor has no dependence on a metric tensor because $$A^{\mu,\nu}-A^{\nu,\mu}=A^{\mu;\nu}-A^{\nu;\mu}.$$ The energy density of an electromagnetic field is invariant in a gravity field. Photons as a quantum are effected by gravity as shown through light bending and red shift experiments suggesting a conflict between theory and experiment. The space-times-time invariance as gravity proposal uses quaternions instead of tensor calculus. Two observers look at two different events. They calculate the difference, then take the square: $$(dt,dx/c,dy/c,dz/c)^2=(dt^2-(dx^2+dy^2+dz^2)/c^2, 2dt dx/c,2dt dy/c,2dt dz/c).$$ The first term is an interval, the other three space-times-time. If the two observers agree on the interval, a constant velocity exists between the two. If the two observers agree on the three space-times-time values, that invariance is the quaternion gravity proposal. The electric field will remain invariant in a gravity field, but not the magnetic field. Why? The electric field is the number of quantum electric charges, unchanged by a gravitational field. The magnetic field is those charges in motion. Motion is changed by gravity. Quaternion gravity may be more consistent for electromagnetism than GR. [Preview Abstract] |
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