A bee returning to the hive... |
The astronomer (by Lucy) |

Stephan LeBohec

- Spring 2019: Introduction to particle physics (PHYS5110)
- Fall 2018: Physics for scientists I (PHY3210)
- Spring 2018: Introduction to Particle Physics (PHYS5110)
- Fall 2017: Preparation for PHYS 2010/2210 (PHYS1500)
- Spring 2017: Introduction to Particle Physics (PHYS5110)
- Fall 2016: Preparation for PHYSICS 2010/2210 (PHYS1500)
- Spring 2016: Introduction to Particle Physics (PHYS5110)
- Fall 2015: Computational physics I (PHYS3730/6720)
- Spring 2015: Computational physics I (PHYS3730/6720)
- Fall 2014: Solid State Physics I (PHYS5510)
- Spring 2014: Electromagnetism and statistical physics (PHYS5020)
- Spring 2014: C/C++ programming lab
- Fall 2013: Solid State Physics I (PHYS5510)
- Fall 2013: Introduction to astrophysics for science teachers (PHYS6950-003)
- Spring 2013: Electromagnetism and statistical physics (PHYS5020)
- Fall 2012: Introduction to quantum mechanics (PHYS5450)
- Spring 2012: Introduction to modern physics (PHYS3740)
- Fall 2011: Introduction to quantum mechanics (PHYS5450)
- Spring 2011: Introduction to computational physics (PHYS3730/6720)
- Fall 2010: Introduction to quantum mechanics (PHYS5450)
- Spring 2010: Introduction to modern Physics (PHYS3740)
- Fall 2009: Electronics I (PHYS3610/6610)
- Spring 2009: General Physics (PHYS2020)
- Spring 2008: General Physics (PHYS2020)
- Spring 2007: Computational Physics II (PHYS6730)
- Fall 2006: Introduction to modern Physics (PHYS3740)
- Spring 2006: Computational Physics II (PHYS6730)
- Fall 2005: Preparation for University Physics (PHYS1500)
- Spring 2005: Computational Physics II (PHYS6730)

- Spring 2019: Lagrange points and the Kordylewski clouds.
- Fall 2017: Scale mechanics.
- Fall 2016: the thought experiment of Elitzur and Vaidman:slides, paper presenting an experimental implementation of the Elitzur and Vaidman bomb thought experiment, paper presenting the observation of interferences with big molecules, paper discussing the quantum state collapse which I followed when preparing this presentation.
- Fall 2014: The speed of light: Slides and paper by M.Urban et al.<\li>
- Fall 2013: The EPR paradox: The original 1935 paper; J.Bell's approach to address the paradox; experimental resolution by A.Aspect et al. and a really nice highlight by Mermin which inspired my undergraduate seminar .
- Spring 2011: Scale relativity
- Fall 2006: Intensity Interferometry

- Scale relativity related topics
- We just submitted "Riccati equations as a scale-relativistic gateway to quantum mechanics"
- 2019 U of U Physics and Astronomy Symposium poster: Riccati equations as a scale relativistic gateway to quantum mechanics
- 2018 U of U Physics and Astronomy Symposium poster: Resolution-scale Dynamics
- 2017 U of U Physics and Astronomy Symposium poster: Search for quantum-like structures in non-quantum macroscopic chaotic systems
- Slides of my Undergraduate Seminar 2017 on Scale Mechanics
- Blog maintained by Clement Vidal and myself about scale relativity
- We have unsuccessfully tried to publish iteratively improved versions of "Resolution-scale relativistic formulation of non-differentiable mechanics" in a refereed journal since 2017. That tells you it is worth gold by now.
- Scale relativistic signature in the Brownian motion of micro-spheres in optical traps (2017)
- Quantum mechanical approaches to the virial (June 2015)
- Here is a 2014 note on the derivation of Lorentz transformation without any a priori assumption about the velocity of light.
- I just wrote a few functions to manipulate quaternions. They are available here.
- Using the above, I wrote a program to construct fractal objects like the von Koch curve but in three dimension. Here is an example of the successive iterations for the construction of fractal dimension 2.
- This is essentially unrelated but I wrote a bunch of functions to write postscript files. They are in this tar file and permit to easily produce a postscript document such as this one.
- 2011 undergraduate seminar
- The scale of the universe (he music is painful but the illustration is great)

- Diagramatic Monte-Carlo with Oleg Starykh and Wen Jin
- Bold Diagrammatic Monte Carlo technique for frustrated spin systems by S.Kulagin et al. (2013)
- Diagrammatic Monte Carlo by Kris Van Houcke et al. (2008)
- Adatoms on graphene with Eugene Mishchenko and Justin Talbot
- Suppression of diffusion of hydrogen adatoms on graphene by effective adatom interaction (June 2015)
- Attraction-repulsion transition in the interaction of adatoms and vacancies in graphene (February 2014)

- Since 2005 I have been working at investigating the potential and approaches of a return to to stellar intensity interferometry. This project is now taken over by Nolan Matthews under the direction of David Kieda but I still like to give a hand when I can.
- Here is a tar file with the SII Monte-Carlo simulation code written by Janvida Rou. The paper is submitted to MNRAS I will post it as soon as it is accepted.
- Here is the 2012 honors thesis on SII Monte-Carlo simulation presented by Janvida Rou and here is an essay on the application of the HBT in particles physics she wrote for an assignment in the introduction to particle and nuclear physics class she took in 2011
- 29th ICRC paper
- 2005 ApJ article
- poster
- 2006 undergraduate seminar slides
- HTRA 2007 conference paper 1, and slides , paper 2 and poster
- Lund 2007 ELT conference paper
- Marseille 2008 SPIE conference paper announcing the formation of a IAU working group on Intensity Interferometry
- First Workshop on Stellar Intensity Interferometry in Salt Lake City, January 29-30 2009
- Astro2010 white paper and RFI document
- SPIE 2010 conference on telescopes and instrumentation in SanDiego:
- Paper by Paul Nunez on Imaging capabilities with a large intensity interferometer
- Deployment of Star Base Utah with two 3m telescopes as a Air Cherenkov and Intensity Interferometry instrumentation test bed.

- For many years (from the time of my PhD until 2012) I worked in the field of Gamma ray astronomy (here for an interactive sky map) with VERITAS. Here is an animated stereo-scopic view of a few selected events recorded with the three first VERITAS telescopes (pictures of telescope 4 under moonlight [1][2]).
- 2009 colloquium at the univesrity of Utah: pptx or pdf
- GrISU(tah) a simulation package for Atmospheric Cherenkov cosmic ray detectors.
- FROGS is a suite of functions to implement the shower image template analysis of atmospheric cherenkov data.
- M87 papers:
- with the Whipple 10m telescope
- 2007 with VERITAS (Pierre Colin)
- 2008-2009 VERITAS monitoring (Michelle Hui)
- 2010 VERITAS campaign, in prep. (Michelle Hui)
- Electromagnetic cascades in black hole magnetospheres, MNRAS Volume 409, Issue 3, pages 1183 (Stephane Vincent)

- Gamma ray attenuation in X-ray binaries (Paul Nunez)
- Paper on Haar wavelets as a tool for the statistical characterization of variability, Astroparticle Physics 34 (2011) 871 (Ryan Price)
- We worked on the optical calibration of the VERITAS telescopes using Rayleigh scattered LASER light pulse. We had a first test run in May 2005, a preliminary analysis is presented at the 29th ICRC. Our most recent paper on this topic is available here. This effort has been somewhat abandonned because of the setup being impractical but we are in the process of resurecting it now (2011).
- We investigated technical approaches to 100TeV gamma-ray astronomy. This culminated in the paper which can be found here
- SGARFACE the Short GAmma Rar Front Air Cherenkov Experiment (in search for ultra short gamma ray burst) described in a paper in Astroparticle Physics. The result of the search for primordial black holes with SGARFACE is presented here
- The data acquisition of SGARFACE is a c program I wrote with a threaded TCP/IP socket server as in the prototype server.c (Makefile). The control interface is a TclTk TCP/IP client script as in the prototype client.wish I find this an easy way to remotly control hardware from a graphical interface easy to develop.

Physics / Astrophysics

- Converting PDF to text
- SDSS III
- The Astronomer's Telespgram
- American Astronomical Society
- American Physical Society
- Optical Long Baseline Interferometry News
- SPIE
- The NASA Astrophysics Data System
- Astrophysics preprint server
- The astrophysicsal Journal
- Elsevier and Astroparticle Physics
- SkyView Virtual Observatory
- NASA Extragalactic Database
- MPI pointers to cosmic-ray and neutrino experiments worldwide
- The American Journal
of Physics

- Staralt: find out if an astronomical object is visible tonight.
- WolframAlpha

For kids and schools:

- I made this minisky a while ago. If you have ideas to improve it, let me know. When putting this together with kids, I like to use Stellarium to show the constellations and how the sky, the Sun and the Moon turn.
- This equatorial sundial is fun to put together with elementary school kids and it brings up good discussions on cardinal directions, time, latitude and longitude, the motion of the Earth around the Sun...
- This sundial is more complicated and works better with middle school students. It is shown assembled here. It includes the equation of time correction and the seasonal change of the height of the Sun. It is designed for Salt-Lake-City. If you would like me to send you a version of it for your own location, just send me your latitude and longitude.
- With this "astrolabe" (assembled), you can measure the latitude by pointing at polarus. In the day time you can measure the height of your school building by applying triangle geometry (with trigonometry or using this template). I would like to see if we could use it to measure the height of clouds... With this activity, you get to talk about similar triangles, angles, the Pythagorean theorem, trigonometry,...
- Here are the slides of a presentation on the history of the measurements of the speed of light. People (high school kids and adults) seem to like it. I believe it can be done with younger students if associated with some demos. The "lecture" covers historical aspects, measurements of time and distance, electromagnetism, relativity. Many other elements could easily be added.

Miscellaneous:

- GSL yacht club and GSL marina
- Bonneville School of Sailing and seamanship
- Wolfram ScienceWorld ( Mathematics, Physics, Astronomy, Biography, ,...)
- The world of mathematical equations
- Cut the knot, Interactive Mathematics
- Astronomy picture of the day
- Khan academy, excellent lectures on all sorts of topics.
- Livres gratuits pour tous
- Livres audio gratuits
- Poesie Francaise
- Radios: RFI, FIP, France Culture.
- Lexilogos
- HyperPhysics
- Fourmilab with in particular the virtual telescope.
- WIKISKY
- Cooking: My Cake and The far breton
- This is a movie that was sent to me by one of my 2008 PHYS2020 students. There is a lot of physics in it!
- A picture of my son Louis by one of his friends
- A picture of a lady with a hand bag by my daughter Lucy

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