Bulletin of the American Physical Society
APS New England Section 2018 Fall Meeting
Volume 63, Number 21
Friday–Saturday, November 2–3, 2018; University of Massachusetts Dartmouth, Dartmouth, Massachusetts
Session D01: Gravity II |
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Room: CCB Building 248 |
Saturday, November 3, 2018 11:00AM - 11:45AM |
D01.00001: Numerical Simulations of Merging Black Holes and Neutron Stars Invited Speaker: Francois Foucart Gravitational waves and electromagnetic signals from merging compact objects provide us with a remarkable opportunity to study general relativity, nuclear physics, and high-energy astrophysics in new and extreme regimes. In order to interpret current and upcoming observations of these systems, we rely on both analytical and numerical modeling. In this talk, I will discuss the role played by numerical simulations in the modeling of neutron star-neutron star and black hole-neutron star binary mergers. I will review how numerical simulations have informed our understanding of the dynamics of neutron star mergers, and how they constrain existing gravitational waveform models. Finally, I will discuss the importance of magnetic fields and neutrinos in neutron star mergers, and show that proper modeling of these effects in numerical simulations is critical to our understanding of the electromagnetic signals powered by mergers. |
Saturday, November 3, 2018 11:45AM - 11:57AM |
D01.00002: Parameter estimation of binary black hole systems using numerical relativity surrogates and a rapid inference framework Feroz H H Shaik Extraction of astrophysical information from gravitational wave (GW) observations relies on both accurate models and rapid analysis algorithms. For high-mass binary black hole systems, one of the most abundant sources of GWs so far, the most accurate waveform templates are generated by numerical relativity simulations which may take weeks to finish for just a single simulation. Surrogate modeling techniques provide an interesting solution to address these issues and are now being integrated into parameter estimation codes. This talk will discuss the integration of a newly developed aligned-spin surrogate waveform model along with the highly parallelizable inference algorithm RIFT (Rapid parameter inference on gravitational wave sources via Iterative FitTing) that can perform an efficient evaluation of the computationally expensive likelihood function. Preliminary parameter estimation results from this project for high-spin systems will be briefly discussed. |
(Author Not Attending)
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D01.00003: On the nature of space-time, cosmological inflation, and expansion of the universe. Mathieu R. R. Beau We propose to investigate the mechanism of cosmological inflation and expansion through the physical properties of space-time [1]. We demonstrate that a cosmological inflation scenario occurs when the bulk modulus of spacetime K=1.64×10109 N/m2, and show that the dark energy density is decreased by a factor of 10122 while the scaling factor expands from 10-60 to 10-32 during a time of the order of 10-42s. At the end of the presentation, we discuss a microscopic interpretation of the inflation mechanism and future investigations on longitudinal waves. [1] Mathieu R. Beau, On the nature of space-time, cosmological inflation, and expansion of the universe. arxiv/1805.03020 (2018) [http://arxiv.org/abs/1805.03020] |
Saturday, November 3, 2018 12:09PM - 12:21PM |
D01.00004: Two space-times or one? Richard M M Kriske, Richard M M Kriske The surface of Space-Time on which Gravitational Waves propagate is stiffer than steel, so stiff that the waves propagate at the speed of light according to the old view used to describe Aether. This author had proposed that ST is comprised of "holes". This author put forward a theory, that "holes" are anti-matter, that had evaporated. The"holes" in semiconductors occasionally collide with an electron and form one gamma ray, instead of two. The positive charge in the hole is used to calculate a current in which is the Probability Current. From Feynman's QED, the positron is an electron traveling backward in time. Although the positron is traveling backward in time, its Probability Current is moving forward in time. It is this contradiction that forms a "Ghost" particle, that has many of the same properties as the Positron, but lacks the ability to "collide". Where does the missing Energy go? This author proposed that it is that missing Energy, that is producing the expansion of Space-Time. Unlike the Big-Bang, but not necessarily contrary to it, this theory, which the author calls "Kriske's Field Theory", actually gives a working and experimentally testable mechanism for the structure and the expansion of Space-Time. This can be tested with LIGO/LISA. |
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