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Liu C.,King Abdullah University of Science and Technology | Di Falco A.,SUPA | Fratalocchi A.,King Abdullah University of Science and Technology
Optics InfoBase Conference Papers | Year: 2014

We observed the phase transition of multiple superradiant states in chaotic optical cavities with multiple open decay channels base on photonic crystals. © 2014 Optical Society of America. Source

Wiggins S.M.,University of Strathclyde | Shanks R.P.,University of Strathclyde | Issac R.C.,University of Strathclyde | Welsh G.H.,University of Strathclyde | And 12 more authors.
Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010 | Year: 2010

Very stable, high quality electron beams (current ̃ 10 kA, energy spread < 1%, emittance ̃ 1 π mm mrad) have been generated in a laser-plasma accelerator driven by 25 TW femtosecond laser pulses. © 2010 Optical Society of America. Source

Street R.A.,Las Cumbres Observatory Global Telescope Network | Tsapras Y.,Las Cumbres Observatory Global Telescope Network | Horne K.,SUPA | Snodgrass C.,Max Planck Institute for Solar System Research | And 8 more authors.
Proceedings of the International Astronomical Union | Year: 2010

Microlensing searches for planets are sensitive to small, cold exoplanets from 1-6AU from their host stars and therefore probe an important part of parameter space. Other techniques would require many years of observations, often from space, to detect similar systems. Microlensing events can be characterised from only ground-based observations over a relatively short (100 d) timescales. LCOGT and SUPA/St Andrews are building a robotic global network of telescopes that will be well suited to follow these events. Here we present preliminary results of the Galactic Bulge observing season 2010 March-October. © International Astronomical Union 2011. Source

Sumi T.,Nagoya University | Bennett D.P.,University of Notre Dame | Bond I.A.,Massey University | Udalski A.,University of Warsaw | And 106 more authors.
Astrophysical Journal | Year: 2010

We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with a planet-star mass ratio of q = [9.5 2.1] × 10-5 via gravitational microlensing. The planetary deviation was detected in real-time thanks to the high cadence of the Microlensing Observations in Astrophysics survey, real-time light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns the stellar mass and distance at Ml = 0.64+0.21 -0.26 M· and Dl = 5.9 +0.9 -1.4 kpc, respectively, so the mass and separation of the planet are Mp = 20+7 -8 M ⊕ and a = 3.3+1.4 -0.8AU, respectively. This discovery adds another cold Neptune-mass planet to the planetary sample discovered by microlensing, which now comprises four cold Neptune/super-Earths, five gas giant planets, and another sub-Saturn mass planet whose nature is unclear. The discovery of these 10 cold exoplanets by the microlensing method implies that the mass ratio function of cold exoplanets scales as dN pl/dlog qαq -0.70.2 with a 95% confidence level upper limit of n < -0.35 (where dN pl/dlog qαqn ). As microlensing is most sensitive to planets beyond the snow-line, this implies that Neptune-mass planets are at least three times more common than Jupiters in this region at the 95% confidence level. © 2010. The American Astronomical Society. All rights reserved.. Source

Reid B.A.,Autonomous University of Barcelona | Reid B.A.,University of Barcelona | Reid B.A.,Princeton University | Percival W.J.,University of Portsmouth | And 31 more authors.
Monthly Notices of the Royal Astronomical Society | Year: 2010

We present the power spectrum of the reconstructed halo density field derived from a sample of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS) Seventh Data Release (DR7). The halo power spectrum has a direct connection to the underlying dark matter power for k ≤ 0.2 h Mpc-1, well into the quasi-linear regime. This enables us to use a factor of ~8 more modes in the cosmological analysis than an analysis with kmax = 0.1 h Mpc-1,aswas adopted in the SDSS team analysis of the DR4 LRG sample. The observed halo power spectrum for 0.02 Source

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