Postdoctoral Fellowships: Caltech (1998-1999); Cambridge (1995-1998)
PhD.: (Theoretical Astrophysics) Harvard (1995)
M.A.S. (Part III Applied Maths. Tripos): Cambridge (1991)
S.B.: (Physics); S.B. (Mathematics) MIT (1990)
Plasma astrophysics has been an underlying theme in much of my recent research because many fascinating astrophysical sources contain highly conducting magnetized plasma. For example, observations of the interplanetary medium, the sun, stars, galaxies, active galactic nuclei (AGN), and planetary nebulae, indicate that magnetized plasmas are important to the dynamics and/or the emission in these systems. Some of my recent activities can be divided in three categories:
1. EJECTORS, ACCRETORS, BURSTERS, AND FLARES
This category of projects is devoted to understanding high energy accreting or jetted astrophysical sources such as active galactic nuclei (AGN), Galactic microquasars, gamma-ray bursts (GRB), solar flares, and planetary nebulae. These sources are magnetized, exhibit aspherical outflows and efficient particle acceleration, and involve turbulence. The physics of particle acceleration, accretion disks, and high energy plasmas are important for these studies.
2. ORIGIN AND DYNAMICS OF MAGNETIC FIELDS
This category of projects focues on a rigorous understanding of the the orgin and dynamics of astrophysical magnetic fields and the associated MHD turbulence. Magnetic fields are not only fundamental for their dynamical role as an intermediary between gravitational energy and radiation in many sources, but are observable astrophysical entities themselves, detected by a variety of techniques. See the following figure (from ApJ 584 L99 (2003). ) which encapsulates some progress (e.g. Phys. Rev. Lett., 89, 265007 (2002)) of how magnetic dynamos conserve magnetic helicity. Here is a more recent review in "Space Science Reviews" Some of the underlying MHD physics also has application to magnetic pinch configurations in laboratory plasma configurations of fusion devices. I am now directing attention toward these applications.
3. FORMATION OF ASTROPHYSICAL OBJECTS
I have been involved in projects focusing on planet formation, star formation, and molecular cloud evolution.
Molecular Clouds, Larsons Laws, and Star Formation: Implications of Virial Evolution of a Mass Conservng Cascade (May 2015) ->
Pictures of Insight on Facebook
Audio recording of Insight speaking for 25 minutes on his play gym alone in the kitchen early in the morning (August 2009). (video showing him at his play gym on another ocassion to show his location) , and comments and transcript of the first half.
KITCHEN WEBCAM Live (video + audio) showing Insight's feeding area. He may or may not be there as he is free to fly around the house.
The playists below include ~1000 selections from YouTube of mostly 1950s and early 1960s doo-wop vocal group recordings (with some Jazz and newer R&B mixed in, mainly in playlist 1). I've aimed for the more obscure gems. Though I enjoy a range of musical styles, doo-wop captured my attention even as a small child. That its original heyday was over long before I was born added to its appeal. Quoting a 1993 NYT article on doo-wop: "...it often possessed an unaffected beauty created with the simplest ingredients -- a straightforward chord structure, spare instrumentation, a strong lead singer and baroque background harmonies...Embedded in this era are a trove of powerful, self-taught tenors whose names are all but forgotten, as well as silky, ethereal harmonies, offered up by groups that fans can distinguish instantly ...At the top were groups with more mysterious, murky sounds, their tenors softer and idiosyncratic..." Doo-wop is commonly satirized by performers substituting mockery for an inability to convey the debonair stylings of the best original groups, and some classical and jazz musicians roll their eyes at the simplicity of the background music. But sometimes simple is sophisticated and the background music is really tertiary to the style-- it's vocal harmony music that originated on street corners without musicians.
Playlist 12 ; Playlist 11 ; Playlist 10 ; Playlist 9 ; Playlist 8 ; Playlist 7 ; Playlist 6 ; Playlist 5 ; Playlist 4 ; Playlist 3 ; Playlist 2 ; Playlist 1;
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