Article Index

This page lists all of the abstracts for the Fall 2014 colloquium series. For dates and speakers, see Colloquium.


"Hawking Radiation as Tunneling," Friday, April 10, 12:00pm, MH 606

Douglas Singleton, California State University, Fresno

 
ABSTRACT: Hawking Radiation is the process whereby a black hole emits blackbody radiation. This apparent violation of the
idea that "nothing can escape a black hole" comes when one studies quantum fields in a curved space-time such as that of a black hole.  
In quantum mechanics one has the phenomenon of tunneling where a quantum particle can pass through a barrier that it is classical forbidden to 
pass through. This talk focuses on Hawking radiation as quantum tunneling whereby particles/fields tunneling across the black hole event horizon.
This tunneling method of calculating Hawking radiation is easy to apply to almost any space-time and it allows one to take into account the
back reaction of the space-time geometry of the black hole due to the emission of the Hawking Radiation.

"Solar Coronal Mass Ejections: What goes up, must come down?," Friday, April 17, 12:00pm, MH 606

Damian Christian, California State University, Northridge

ABSTRACT: I will review some of the outstanding issues regarding heating the Sun’s corona and present our new multi-wavelength study of a failed coronal mass ejection. I obtained H-alpha high spatial and time resolution observations of the upper solar chromosphere and supplemented these with multi-wavelength observations from the Solar Dynamic Observatory (SDO) and the Hinode ExtremeUltraviolet Imaging Spectrometer (EIS). The H-alpha observations were conducted on 11 February 2012 with the Hydrogen-Alpha Rapid Dynamics Camera (HARDcam) instrument at the National Solar Observatory's Dunn Solar Telescope. Our H-alpha observations found large downflows of chromospheric material returning from coronal heights following a failed prominence eruption. We have detected several large condensations (``blobs'') returning to the solar surface at velocities of ~200 km/s in both H-alpha and several SDO AIA band passes. The average derived size of these ``blobs'' in H-alpha is 500 by 3000 km^2 in the directions perpendicular and parallel to the direction of travel, respectively. A comparison of our ``blob" widths to those found from coronal rain, indicate there are additional smaller, unresolved ``blobs" in agreement with previous studies and recent numerical simulations. Our observed velocities and decelerations of the ``blobs'' in both H-alpha and SDO bands are less than those expected for gravitational free-fall and imply additional magnetic or gas pressure impeding the flow. We derived a kinetic energy ~2 orders of magnitude lower for the main eruption than a typical CME, which may explain its partial nature. Detailed studies of failed CMEs and other phenomenon will allow further constraints on the coronal magnetic field and in the larger problem of coronal heating.

"Detecting gravitational waves from binary black holes," Friday, May 1, 12:00pm, MH 606

Daniel Hemberger, California Institute of Technology

ABSTRACT: Binary black holes are one of the most promising science targets for the advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), which is expected to be operational later in 2015. The detections made by aLIGO (or lack thereof) will provide stringent tests of Einstein's theory of General Relativity and our understanding of many astrophysical processes. It will be much easier to make a detection if aLIGO knows what to look for. We use numerical relativity simulations to accurately predict gravitational waveforms from binary black holes, but performing many simulations is computationally prohibitive. However, using reduced order modeling, we can make the most efficient use of numerical relativity and provide aLIGO with the predictions that are needed to maximize its scientific output.

"Master's Candidates Presentations," Friday, May 8, 12:00pm, MH 606

Master's Candidates, California State University, Fullerton

 
Friday, May 8
12:00 Ben Stenger - Internship at JPL (Feagin)
12:15 Joshua Hacker - "Distinguishing points from glow in scatter images" (Smith)
12:30 Gabriela Serna - "(Gravitational-wave) Astronomy education research" (Smith/Loverude)
12:45 Steve Jasso - "The Ou Hong Mandel Dip Quantum optics experiment" (Fearn)
1:00 Alex Gauf - "Thermoelectric effect in quantum dot system" (Tifrea)
1:15 Emil Rueckert - “Differential cross sections for electronic excitation of ethanol” (Khakoo)
1:30 Ahmad Sakaamini - “Low Energy Electron Impact Vibrational Excitation of Methyl Chloride”(Khakoo)
1:45 Al Tapia - “Experimental Electron Scattering: Time of flight” (Khakoo)