Summer Program

Physics in the Era of Nanohertz Gravitational Waves

August 3–24, 2025

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Organizers:

Kimberly Boddy, University of Texas Austin
Jeff Dror, University of Florida
Carl-Johan Haster, University of Nevada Las Vegas
*Luke Kelley, University of California Berkeley

*represents the organizer in charge of promoting diversity

Recent evidence for the stochastic gravitational wave (GW) background in the nHz regime marks a significant milestone in GW astronomy. This workshop will bring together GW data specialists, astrophysical modeling experts, particle physicists, and cosmologists to explore what we can learn about the sources of nHz GWs from pulsar timing arrays and other low-frequency detection methods (e.g. astrometric, doppler-tracking, etc). The GW signal will provide a powerful probe into the formation of galaxies and could reveal new physics from the very early universe (e.g., inflation, phase transitions, topological defects, dark matter). The goal of the workshop is to foster collaborative efforts to generate new ideas that progress the field and address outstanding challenges.

Summer Workshops

The summer program, running for 16 weeks from late-May to mid-September, emphasizes exciting open problems at the cutting edge. Two or three concurrent workshops, each with a specific focus selected for timeliness and the potential for breakthroughs and of two to five weeks in length, establish the main themes of each week, with twelve or thirteen different workshops each summer, balanced across fields including particle physics, string theory, astrophysics and hard and soft condensed matter physics, as well as emerging areas including biological physics, ultra-cold atom physics, quantum information, and physical mathematics. Additional researchers participate in small working groups or as individual researchers. This framework is designed to maximize informal interactions and free discussion within each area and to promote cross-fertilization between different areas via the common language of theoretical physics. Participation in the summer program of the Aspen Center for Physics is by application and subsequent invitation only. View past workshops.