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About

P. Petitjean is a leading astrophysicist whose research focuses on the large-scale structure of the universe, dark energy, and the high-energy transient phenomena of gamma-ray bursts (GRBs). His most significant contribution is his central role in the **BigBOSS Experiment**, a Stage IV ground-based dark energy survey designed to map the expansion history of the universe using baryon acoustic oscillations (BAO). This ambitious project, which Petitjean helped conceive and develop, aims to conduct a wide-area galaxy and quasar redshift survey over 14,000 square degrees, a cornerstone effort in modern cosmology that has garnered **over 80 citations** and was conditionally accepted by NOAO as a major new instrumentation initiative. In parallel, Petitjean has been instrumental in the **ECLAIRs micro-satellite mission**, a dedicated space observatory designed for multi-wavelength studies of GRB prompt emission. Launched in 2009, ECLAIRs provides critical, simultaneous observations across X-ray and optical bands, enabling researchers to probe the most energetic explosions in the universe and their use as cosmological probes. Through these dual efforts—probing the universe’s dark energy-driven expansion and its most violent transient events—Petitjean has made lasting contributions to our understanding of cosmic evolution.