So a neutrino runs into a tachyon in a bar.... HHere's a collection of interesting twitter snippets from physicists I follow on twitter about today's neutrino webcast announcing the surprising, and frankly unbelievable, results that the OPERA collaboration observed superluminal neutrinos. I haven't watched the webcast myself, nor read the paper beyond the abstract yet so can only comment that I believe it must be systematics. That said it would be insanely interesting to be proven otherwise. Fin........ Read more »
The OPERA Collaboraton: T. Adam, N. Agafonova, A. Aleksandrov, O. Altinok, P. Alvarez Sanchez, S. Aoki, A. Ariga, T. Ariga, D. Autiero, A. Badertscher.... (2011) Measurement of the neutrino velocity with the OPERA detector in the CNGS beam. CERN. arXiv: 1109.4897v1
A few days ago in gr-qc journal club we discussed an interesting paper by a member of our own institute, Probing the dark matter issue in f(R)-gravity via gravitational lensing.1. Background Dark Matter We theoretically expect dark matter to exist based largely on extensive observations of both dynamics (rotation curves and objects such as the [...]... Read more »
M. Lubini, C. Tortora, J. Näf, Ph. Jetzer, & S. Capozziello. (2011) Probing the dark matter issue in f(R)-gravity via gravitational lensing. Preprint. arXiv: 1104.2851v1
I have previously blogged about Structure finding in cosmological simulations and the Haloes Going Mad conference in Madrid this past spring–there you will find the basic background if you are unfamiliar with the subject and I'll skip that in this post. The result of this conference was a Halo-finder comparison project and its findings were recent posted on the physics arxiv in the paper Haloes gone MAD: The Halo-Finder Comparison Project. I'll summarize them here.
The paper concentrates on........ Read more »
Alexander Knebe, Steffen R. Knollmann, Stuart I. Muldrew, Frazer R. Pearce, Miguel Angel Aragon-Calvo, Yago Ascasibar, Peter S. Behroozi, Daniel Ceverino, Stephane Colombi, Juerg Diemand.... (2011) Haloes gone MAD: The Halo-Finder Comparison Project. Mon. Not. R. Astron. arXiv: 1104.0949v1
Walls, filaments and voids: it is thought that the large scale distribution of matter is a complex network of galaxies and galaxy clusters connected by elongated filaments and sheetlike walls, outlining vast underdense regions known as voids and meeting at dense and compact regions known as haloes. Aragon-Calvo et. al. in  build upon the SpineWeb framework outlined in  , which has the capability of identifying these walls, filaments and clusters in cosmological simulations to examine the e........ Read more »
A few weeks ago, Astrophysics Master’s student Tina Wentz gave a great overview of the phenomenon known as the Pioneer Anomaly in our gr-qc journal club. I’m indebted to her for that overview as well as pointing me to relevant papers in the preparation of this post. Background Launched in 1972 and 1973 respectively, the [...]... Read more »
Slava G. Turyshev, Viktor T. Toth, Larry R. Kellogg, Eunice. L. Lau, & Kyong J. Lee. (2005) The Study of the Pioneer Anomaly: New Data and Objectives for New Investigation. Int.J.Mod.Phys.D15:1-56,2006. arXiv: gr-qc/0512121v2
John D. Anderson, Philip A. Laing, Eunice L. Lau, Anthony S. Liu, Michael Martin Nieto, & Slava G. Turyshev. (2001) Study of the anomalous acceleration of Pioneer 10 and 11. Phys.Rev.D65:082004,2002. arXiv: gr-qc/0104064v5
Some of the most important equations in physics can be solved by constructing a beast with a curious set of properties, called a Green’s function. This post contains some interesting nuggets from a lecture I gave on St. Patrick’s day about Green’s functions to the course I assist, Mathematical Methods in the Physical Sciences II. I’ll give some historical background about the life of George Green, the functions’ namesake, introduce what a Green’s function actually is–and what exact........ Read more »
George Green. (1841) An Essay on the Application of mathematical Analysis to the theories of Electricity and Magnetism. Crelle's Journal. arXiv: 0807.0088v1
Globular Clusters (GCs) Globular clusters are groups of roughly spherical, densely packed stars. They are thought to have formed at the same time as most galaxies and the stars which make them up are some of the oldest known–thus GCs are an excellent probe of galaxy formation and evolution. They have a high central stellar [...]... Read more »
A. P. Huxor, A. M. N. Ferguson, N. R. Tanvir, M. J. Irwin, A. D. Mackey, R. A. Ibata, T. Bridges, S. C. Chapman, & G. F. Lewis. (2011) Exploring the Properties of the M31 Halo Globular Cluster System. MNRAS. arXiv: 1102.0403v1
Abadi, M., Navarro, J., & Steinmetz, M. (2006) Stars beyond galaxies: the origin of extended luminous haloes around galaxies. Monthly Notices of the Royal Astronomical Society, 365(3), 747-758. DOI: 10.1111/j.1365-2966.2005.09789.x
QFT I’m lucky to have a job in which I can take two weeks of mornings of work to study a nominally tangential subject in greater depth. These past two weeks I attended a series of lectures at the ETH on physics beyond the standard model, the first week was very technical but exciting to [...]... Read more »
F. I. Cooperstock, & S. Tieu. (2005) General Relativity Resolves Galactic Rotation Without Exotic Dark Matter. arXiv. arXiv: astro-ph/0507619v1
In the morning when I get into lab, around 10 in the morning, I have a set routine. Make a cup of coffee or tea, update my research wiki with a new entry corresponding to the day’s tasks, write/reply to work related emails, admin phygg.com (spam management etc.), scan/vote on papers of interest. Finally I [...]... Read more »
C. Y. Hui, K. S. Cheng, Y. Wang, P. H. T. Tam, A. K. H. Kong, D. O. Chernyshov, & V. A. Dogiel. (2011) The Fundamental Plane of Gamma-ray Globular Clusters. Astrophysical Journal, Volume 726, Page 100 (2011). arXiv: 1101.4107v1
R. van de Weygaert, K. Kreckel, E. Platen, B. Beygu, J. H. van Gorkom, J. M. van der Hulst, M. A. Aragon-Calvo, P. J. E. Peebles, T. Jarrett, G. Rhee.... (2011) The Void Galaxy Survey. "Environment and the Formation of Galaxies: 30 years later", Proceedings of Symposium 2 of JENAM 2010,. arXiv: 1101.4187v1
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