Lisa Randall

Theoretical physicist and cosmologist. Frank B. Baird Jr. Professor of Science at Harvard University. Works on particle physics, supersymmetry, baryogenesis, cosmological inflation, dark matter, and extra dimensions. Known for the Randall-Sundrum model of warped extra dimensions, and for the speculative dark disk / dinosaur extinction hypothesis. Author of Warped Passages (extra dimensions) and Dark Matter and the Dinosaurs (dark matter and mass extinction). One of the most cited physicists of the past decade.

Background

Research spans the formal (warped extra dimensions, supersymmetric models, baryogenesis) and the speculative (dark disk, periodic extinction events). Randall-Sundrum (1999) proposed that an extra spatial dimension could be warped — a model that addresses the hierarchy problem and has testable collider predictions. Her popular-science writing engages deeply with epistemology: what we can know, how physics extends perception, the limits of science.

Known for: Randall-Sundrum warped extra dimensions; dark disk / Oort Cloud / dinosaur extinction hypothesis; the effective theory approach to physics; cautionary position on theoretical overconfidence (SUSY at LHC); defence of wave-function realism against relational QM.

Appearances in this wiki

Key positions

• Dark matter constitutes ~5× the energy density of ordinary matter and was the primary driver of galaxy formation
• Dark matter’s spherical distribution (vs the disk of ordinary matter) is a consequence of its inability to radiate energy
• The dark disk hypothesis: a fraction of dark matter may have radiative interactions and could form a thin disk that periodically disturbs the Oort Cloud
• WIMPs remain undetected; dark matter’s identity is genuinely unknown
• The LHC’s failure to find supersymmetry is a cautionary tale about theoretical overconfidence
• Effective theory is the right approach: answer the question you can constrain, not the biggest question you can imagine
• Wave functions are real; electrons exist between measurements (against Rovelli’s relational QM)
• Inconsistencies are the fuel of discovery — being bothered by things that don’t fit is the primary driver