Risa Wechsler KIPAC director

Welcome to Risa Wechsler, who began her appointment as director of the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC). Our tremendous gratitude is due to Tom Abel, whose ably led KIPAC over the past five-years.  

The Kavli Institute for Particle Astrophysics and Cosmology, or KIPAC, was inaugurated in 2003 as an independent laboratory of Stanford University to serve as a bridge between the disciplines of astrophysics, cosmology and particle physics. KIPAC's members work in the Physics and Applied Physics Departments on the Stanford campus and at the SLAC National Accelerator Laboratory. Its mission is to bring the resources of modern computational, experimental, observational and theoretical science to bear on our understanding of the universe at large.


Research Highlights

Mar 14, 2019 | Determining the Hubble-Lemaitre parameter with the Simons Observatory

The model that currently best describes evolution and structure of the Universe (referred to as Lambda-CDM or LCDM) is consistently in agreement qualitatively and quantitatively with virtually all observations we make. And with the enormous increase in the amount of data coming from different cosmic probes (for example, Type Ia supernovae, galaxy surveys, gravitational lensing, the cosmic microwave background [CMB], etc.), our ability to extensively cross-check results and improve our theoretical understanding is only growing. But LCDM isn’t perfect, and when multiple independent measurements of the same parameter are involved, there arises the distinct possibility of finding results that are in tension with each other—the measurements don’t match up, even when error bars are taken into account.

Upcoming Events


SLAC, Kavli 3rd Floor Conf. Room

10:30 am
11:00 am

Campus, Varian 355

11:00 am


| An astronomical data challenge
| Tangled magnetic fields power cosmic particle accelerators
| We Visited the World's Largest Camera and Damn
| Gravitational lenses
| Q&A: Finding Earth-like exoplanets requires new space telescopes

Recent ArXiv Publications


View all recent publications