Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session K13: High Energy Gamma Rays from GRB and Gravitational Wave Detection |
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Sponsoring Units: DAP Chair: Jonathan Granot, Stanfor Linear Accelerator Center Room: Washington 6 |
Sunday, February 14, 2010 3:30PM - 3:42PM |
K13.00001: High Energy Radiation from Black Holes in Gamma Ray Bursts Charles Dermer, Govind Menon, Soebur Razzaque, Justin Finke Gamma ray bursts are sources of broadband radio-through-gamma radiation that are thought to occur during the formation of black holes from stellar core collapse or compact-object coalescence. Particles accelerated in the shock waves of relativistic plasma ejected from GRB sources make cosmic rays, gamma rays and neutrinos. Signatures of ultra-high energy cosmic rays in GRBs should reveal characteristic hadronic emissions. In this talk, contrasting leptonic and hadronic emission signatures in the electromagnetic spectrum of GRBs are considered as a probe of particle acceleration in GRBs. [Preview Abstract] |
Sunday, February 14, 2010 3:42PM - 3:54PM |
K13.00002: Hadronic interpretation of high energy radiation from Fermi LAT GRBs Soebur Razzaque, Charles Dermer, Justin Finke Data collected with the Fermi large area telescope (LAT) from gamma-ray bursts (GRBs) challenge our understanding of the high energy radiation mechanisms from ultra-relativistic jets. Delayed onsets of 100 MeV radiation, GeV emission extending to well after the decay of keV-MeV emission, large fluences in high energy components and large jet bulk Lorentz factors are common features in Fermi LAT GRBs and require consistent theoretical explanation. GRBs have long been considered as candidates of ultrahigh-energy cosmic rays (UHECRs). We investigate ion acceleration in GRB jets, and the high energy signatures of their hadronic and electromagnetic interactions. We show that accumulation of slowly cooling ions compared to rapidly cooling electrons in the GRB shocks can explain delayed onset of 100 MeV radiation and extended GeV emission. [Preview Abstract] |
Sunday, February 14, 2010 3:54PM - 4:06PM |
K13.00003: Probing the Association of Gravitational-Wave and Gamma-Ray Bursts with LIGO and Virgo Laura Cadonati Gamma Ray Bursts (GRBs), intense flashes of $\gamma$-rays routinely detected by satellite-based detectors, have been a target of gravitational wave searches since the early days of laser interferometer data acquisition. A measured correlation between GRBs and gravitational wave transients would provide not only a smoking-gun evidence for the detection of gravitational waves, but also new insights in the physics of GRB progenitors. This talk presents the results of a search for gravitational wave bursts associated with 137 GRBs detected during the fifth LIGO Science run and the first Virgo science run. We discuss the astrophysical interpretation and implication of these results for future investigations of GRBs and gravitational wave bursts. [Preview Abstract] |
Sunday, February 14, 2010 4:06PM - 4:18PM |
K13.00004: Astrophysically Triggered Searches for Gravitational Waves Zsuzsa Marka Many expected sources of gravitational waves are observable in more traditional channels, via gamma rays, X-rays, optical, radio, or neutrino emission. Some of these channels are already being used in searches for gravitational waves with the LIGO-GEO600-Virgo interferometer network, and others are currently being incorporated into new or planned searches. Astrophysical targets include gamma-ray bursts, soft-gamma repeaters, supernovae, and glitching pulsars. The observation of electromagnetic or neutrino emission simultaneously with gravitational waves could be crucial for the first direct detection of gravitational waves. Information on the progenitor, such as trigger time, direction and expected frequency range, can enhance our ability to identify gravitational wave signatures with amplitude close to the noise floor of the detector. Furthermore, combining gravitational waves with electromagnetic and neutrino observations will enable the extraction of scientific insight that was hidden from us before. We will discuss the status for astrophysically triggered searches with the LIGO-GEO600-Virgo network and the science goals and outlook for the second and third generation gravitational wave detector era. [Preview Abstract] |
Sunday, February 14, 2010 4:18PM - 4:30PM |
K13.00005: Final Results of the All-sky Search for Gravitational-wave Bursts in the First Joint LIGO-GEO-Virgo Run Amber Stuver The LIGO-GEO-Virgo network of gravitational-wave detectors collected data of unprecedented sensitivity in their 2005-2007 science runs and have produced the most sensitive all-sky burst search to date. Using data from these runs, we describe the search for bursts: short-duration gravitational-wave signals with unknown or poorly modeled waveforms. Such signals may accompany astrophysical events like core-collapse supernovae, and the merger phase of coalescing binary compact stars. 387 days of data were collected when at least 2 of the 4 LIGO/Virgo detectors were in operation and four different analysis algorithms were applied to these data in the frequency band of 50 - 6000 Hz. In this talk, we will discuss the search algorithms used, their combined results and their astrophysical interpretation. [Preview Abstract] |
Sunday, February 14, 2010 4:30PM - 4:42PM |
K13.00006: Frequency stabilization of a laser used to measure Plank scale indeterminacy Robert Lanza, Aaron Chou, Young-Kee Kim Macroscopic effects of spacetime quantization due to the holographic principle will soon be tested using precision power recycled interferometers at Fermilab. The relative transverse position of two objects is predicted to experience a quantum blurring, resulting from the overall reduction in the number of spacetime degrees of freedom set by holographic entropy bounds. This blurring is manifested in a spectrally flat noise signal in relative phase measurements made in large Michelson interferometers. In the proposed experiment, the holographic noise levels are amplified to a detectable level using $\sim $40 m interferometer arms, in which the beams are recycled using cavity mirrors. The frequency of the laser must be sufficiently stable before injection into the long, narrow bandwidth cavity arms of the interferometer. We present here studies of the shorter, wider bandwidth cavities which we are developing to pre-stabilize the laser frequency. This technology will also be applied to a Fermilab cavity-enhanced search for axions created from a laser beam. [Preview Abstract] |
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