Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session K5: Mini-symposium: Gravitational Waves Science Interest GroupFocus
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Sponsoring Units: DAP Chair: John Conklin, University of Florida Room: Virginia B |
Sunday, January 29, 2017 1:30PM - 2:06PM |
K5.00001: Gravitational Wave Science Interest Group Invited Speaker: John Ziemer |
Sunday, January 29, 2017 2:06PM - 2:18PM |
K5.00002: LISA Pathfinder: First steps to observing gravitational waves from space Paul McNamara With the first direct detection of gravitational waves a little over a year ago, the gravitational window to the Universe has been opened. The gravitational wave spectrum spans many orders of magnitude in frequency, with several of the most interesting astronomical sources emitting gravitational waves at frequencies only observable from space The European Space Agency (ESA) has been active in the field of space-borne gravitational wave detection for many years, and in 2013 selected the Gravitational Universe as the science theme for the third large class mission in the Cosmic Vision science programme. In addition, ESA took the step of developing the LISA Pathfinder mission to demonstrate the critical technologies required for a future mission. The goal of the LISA Pathfinder mission is to place a test body in free fall such that any external forces (acceleration) are reduced to levels lower than those expected from the passage of a gravitational wave LISA Pathfinder was launched on the 3rd December 2015 from the European Spaceport in Kourou, French Guiana. After a series of 6 apogee raising manoeuvres, the satellite left earth orbit, and travelled to its final science orbit around the first Sun-Earth Lagrange point (L1). Following a relatively short commissioning phase, science operations began on 1st March 2016. In the following 3 months over 100 experiments and over 1500hours of noise measurements have been performed, demonstrating that the observation of gravitational waves from space can be realised. [Preview Abstract] |
Sunday, January 29, 2017 2:18PM - 2:30PM |
K5.00003: Update on Advanced LIGO: the second observing run Lisa Barsotti After several months of detector improvements, the two Advanced LIGO gravitational wave detectors are coming back on-line by the end of 2016 for their second Observing run, O2. In this talk I will discuss the status of Advanced LIGO and its observing plan. [Preview Abstract] |
Sunday, January 29, 2017 2:30PM - 2:42PM |
K5.00004: Low-frequency gravitational-wave science frontiers Scott Hughes With LIGO detecting stellar mass black holes and (soon) other stellar mass compact objects, and with LISA Pathfinder demonstrating important elements of the technology needed to fly a gravitational-wave antenna in space, the case for a low-frequency, space-based gravitational-wave detector --- LISA --- is stronger than ever. In this talk, I will survey the landscape of low-frequency gravitational-wave astronomy. The LISA frequency band from $\mbox{a few}\times10^{-5}$ Hz to about 1 Hz is one which is rich with known sources whose measurement will enable new astronomical and physical measurements of important systems. It is also a band with great potential discovery space. In this talk, I will survey the known knowns and known unknowns in the LISA band, describing the frontiers that we can study in advance of the mission, and the frontiers that LISA measurements will unveil. I will also talk about the possible unknown unknowns where surprising discoveries may lurk. [Preview Abstract] |
Sunday, January 29, 2017 2:42PM - 2:54PM |
K5.00005: Spectroscopy of Kerr black holes with Earth- and space-based interferometers Emanuele Berti, Alberto Sesana, Enrico Barausse, Vitor Cardoso, Krzysztof Belczynski We estimate the potential of present and future interferometric gravitational-wave detectors to test the Kerr nature of black holes through "gravitational spectroscopy," i.e. the measurement of multiple quasinormal mode frequencies from the remnant of a black hole merger. Using population synthesis models of the formation and evolution of stellar-mass black hole binaries, we find that Voyager-class interferometers will be necessary to perform these tests. Gravitational spectroscopy in the local Universe may become routine with the Einstein Telescope, but a 40-km facility like Cosmic Explorer is necessary to go beyond $z\sim 3$. In contrast, eLISA-like detectors should carry out a few - or even hundreds - of these tests every year, depending on uncertainties in massive black hole formation models. Many space-based spectroscopical measurements will occur at high redshift, testing the strong gravity dynamics of Kerr black holes in domains where cosmological corrections to general relativity (if they occur in nature) must be significant. [Preview Abstract] |
Sunday, January 29, 2017 2:54PM - 3:06PM |
K5.00006: L3 Study Team Activities David Shoemaker The NASA-Chartered L3 Study Team is working to develop the US community participation and to support NASA's contribution to the ESA-led LISA mission to observe gravitational waves via space-based detectors. The present activities of the L3ST will be described, and the next steps for the Study Team will also be given. [Preview Abstract] |
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