01
Cosmology & the Dark Sector
Dark energy, dark matter, modified gravity, cosmological tensions, and the connection between fundamental models and precision cosmological data.
Explore this work →Associate Professor · University of Hawaiʻi at Mānoa
Fundamental physics from the cosmos.
I am a theoretical physicist working at the intersection of cosmology, astrophysics, gravitation, and particle physics.
I use the Universe as a laboratory to search for new physics, such as dark matter and dark energy, using cosmological observations, stars, black holes, neutron stars, and gravitational waves.
Research supported by NASA and the National Science Foundation.
Research program
What are the laws that govern our Universe?
From cosmic expansion to stellar interiors and compact objects, complementary astrophysical systems let us test fundamental physics across an extraordinary range of scales and environments.
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Astrophysical Laboratories for Fundamental Physics
Using stars and other astrophysical systems to search for new particles, dark matter interactions, and departures from standard gravity.
Explore this work →03
Black Holes, Neutron Stars & Gravitational Waves
Compact objects and their populations as probes of gravity, particle physics, stellar evolution, and the origin of massive black holes.
Explore this work →Selected recent work.
Unifying Early and Late Dark Energy
Exploring the dynamical requirements and theoretical obstructions for models that connect early- and late-time cosmic acceleration.
Dark Matter Silences Cepheids in the Galactic Center
Showing how dark-matter interactions can alter stellar evolution and suppress the Cepheid population expected near the Galactic Center.
Can GW231123 Have a Stellar Origin?
Testing whether an unusually massive binary-black-hole event can be produced through stellar evolution.