Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session G07: Advances in International Collaborations for Gravitational Wave DetectionInvited Live Streamed Undergrad Friendly
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Sponsoring Units: FIP Chair: Alan Hurd, LANL Room: Salon 4 |
Sunday, April 10, 2022 8:30AM - 9:06AM |
G07.00001: The KAGRA Gravitational Wave Project Invited Speaker: Takaaki Kajita KAGRA is a laser interferometer with 3km X 3km arm lengths and is designed to observe gravitational waves jointly carrying out the observation runs with LIGO and Virgo. The whole facility is located in deep underground. The unique feature is to use cryogenic mirrors to reduce the thermal noises. I will discuss the status of the KAGRA project and its scientific goals. |
Sunday, April 10, 2022 9:06AM - 9:42AM |
G07.00002: Einstein Telescope and the 3rd generation GW observatories: science, technologies and perspectives Invited Speaker: Michele Punturo 3rd generation gravitational wave (GW) observatories will pick up in the next decade, the legacy of the current generation of GW detectors, Advanced LIGO and Advanced Virgo, allowing the exploration of almost the entire Universe through GW signals. Einstein Telescope (ET) and Cosmic Explorer (CE) are the pioneer projects aiming to the realisation of a 3rd generation Gravitational Wave Observatory respectively in Europe and in US. Benefiting of the momentum given by the scientific successes of the LIGO and Virgo detectors, ET and CE projects had, in the last few years, important boosts toward their realisation; in particular, ET is now entered in several national and international roadmaps. ET and CE, working together and/or standalone, will be simultaneously new discovery and precision measurement observatories; hey have a rich variety of scientific and multidisciplinary targets in astrophysics, nuclear physics, fundamental physics and cosmology. In fact, for example, ET aims to investigate almost the whole Universe, up to the dark ages, through the coalescence of stellar and intermediate mass black holes; it will detect and measure in great detail the gravitational wave signal generated by hundreds of thousands coalescences of neutron stars per year, revealing the nuclear physics governing this kind of stars. ET will be also a technological challenge: in order to achieve the expected sensitivity a new underground research infrastructure will be realised, a multi-interferometer per detector design will be implemented hosting new or updated technologies studied to reduce the noises limiting the current detectors. An overview of the science targets, of the observatory design, of the needed technologies and project organisation, with a special focus on the ET observatory, will be presented. |
Sunday, April 10, 2022 9:42AM - 10:18AM |
G07.00003: The International Pulsar Timing Array: A Galactic-Scale Gravitational Wave Observatory Invited Speaker: Maura McLaughlin The International Pulsar Timing Array (IPTA) is a network of researchers and students composed of the NANOGrav Physics Frontiers Center (PFC) and colleagues from Australia, Europe, and India working to directly detect gravitational waves at frequencies 11 orders of magnitude smaller than LIGO through high-precision timing of radio pulsars using the world's largest radio telescopes. This experiment requires observations of pulsars distributed across the sky, necessitating observations with radio telescopes across the globe and an efficient framework for international collaboration. The most promising GW sources in the low-frequency band are supermassive binary black holes at the cores of merging galaxies. Hence, a detection of GWs will provide new insights into galaxy growth and evolution through cosmic time, transforming our understanding of the Universe. Recent IPTA analyses indicate the presence of a common spectral signature in IPTA data consistent with a stochastic background of gravitational waves. However, it does not yet show the quadrupolar spatial correlations necessary to claim a detection. In this talk, I will provide an overview of our experiment, describe the scientific benefits and challenges of international collaboration, highlight the most recent gravitational-wave analysis results, and discuss the very promising future of the IPTA experiment. |
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