User:Jfields7/Choose an Article

Article Selection
Please list articles that you're considering for your Wikipedia assignment below. Begin to critique these articles and find relevant sources.

Option 1

 * Article title
 * Gamma-ray burst progenitors


 * Article Evaluation
 * The article is informative and good quality, but it's a bit short. The long GRB section discusses how to generate a jet, but it doesn't go into possible emission mechanisms. Some good candidates to include might be the fireball model (based on synchrotron emissions) and the cannonball model (based on cyclotron emissions). It would also be worthwhile to point out the shortcomings in these models, particularly with modeling afterglows for more recent observations. There's currently a section on the diversity of long GRB origins which goes over my head, but a discussion on variability of light curves would also be interesting, as most of my research has focused on these points. Some of this information is present in the GRB article itself, so it's a bit disappointing not to see it in this more specific one.


 * Sources
 * A. Panaitescu, P. Meszaros, and M. J. Rees, “Multiwavelength Afterglows in Gamma-Ray Bursts: Refreshed Shock and Jet Effects,” The Astrophysical Journal 503, 314–324 (1998).
 * Dado, S., Dar, A., and De Rújula, A., “On the optical and X-ray afterglows of gamma-ray bursts*,” A&A 388, 1079–1105 (2002).
 * B. Gendre et al., “Testing gamma-ray burst models with the afterglow of GRB 090102*, ”Monthly Notices of the Royal Astronomical Society 405, 2372–2380 (2010).

Option 2

 * Article title
 * Riemann solver


 * Article Evaluation
 * This is a mid-importance article, but there's really not a lot of information. What information is there is usually vague and poorly written. Adding a brief review of the Godunov method would be great, since then it can also be explained what the approximate solvers are actually approximating. I've worked with the Roe solver, HLLE, and HLLC (including rederiving it for general curvilinear coordinates), so I may be able to expand these sections quite a bit. Someone should really add HLL, which both HLLE and HLLC are based on. Solvers based on characteristic decomposition (sort of like the Roe solver, but more advanced) are also fairly common because they are generally very accurate and carefully select solutions that obey physical entropy constraints, but they aren't mentioned here at all.


 * Sources
 * LeVeque, R. J., Numerical Methods for Conservation Laws, Birkhäuser, 2nd ed. (1992).
 * Harten, A., Lax, P.D. and van Leer, B. (1983) On Upstream Difference and Godunov-Type Schemes for Hyperbolic Conservation Laws. SIAM Review, 25, 35-61. http://dx.doi.org/10.1137/1025002

Option 3

 * Article title
 * Relativistic Euler equations


 * Article Evaluation
 * This article cites no sources and provides only very basic information. I could not only add sources for the material already there, but I could add a section describing them in the conservative form typically used in relativistic hydrodynamics. Additionally, this could be made much more general with virtually no effect on the readability; the relativistic hydro equations account for effects from GR, too, not just special relativity, if you derive them with a general metric in mind. I need to be careful to keep my edits relatively general; my experience is in computational fluid dynamics, so my edits are going to lean heavily in that direction. It would be worthwhile to do some research on other applications for the relativistic hydro equations. In the right context, the Blandford-McKee solution might not be a bad thing to talk about.


 * Sources
 * I need to look these up, but some good ones to start with would be Bernard Schutz's A First Course in General Relativity and Rezzolla and Zanotti's Relativistic Hydrodynamics. Dr. Neilsen and Hirschmann's wavelet paper has some solid references to the Valencia formulation commonly used in numerical work. While looking for other applications, it might be worthwhile to look up the original paper on the fireball model for GRBs; that was more or less analytic, so I'm sure it uses the RFD equations at some point.
 * For actual sources used, see User:Jfields7/Relativistic Euler equations/Bibliography.

Option 4

 * Article title
 * Article Evaluation
 * Sources
 * Sources
 * Sources

Option 5

 * Article title
 * Article Evaluation
 * Sources
 * Sources
 * Sources