NSF award 2543275 · Johns Hopkins University

CAREER: Equivalence Principle Test with Ytterbium Atom Interferometry

Final report due

31 May 2031

in 1,686 days · The award ends on 31 January 2031.

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Decide about an extension3 Oct 2030in 1446 days
award ending 2031-01-31 · Research.gov
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Extension request17 Dec 2030in 1521 days
award ending 2031-01-31 · Research.gov
PAPPG 24-1: “at least 45 days prior to the end date”
No-cost extension notice21 Jan 2031in 1556 days
award ending 2031-01-31 · Research.gov
PAPPG 24-1: “at least ten calendar days prior to the end date”
Final report due31 May 2031in 1686 days
award ending 2031-01-31 · Research.gov
PAPPG 24-1: “no later than 120-days following the end date of the award”
Project outcomes report due31 May 2031in 1686 days
award ending 2031-01-31 · Research.gov
PAPPG 24-1: “no later than 120 days following the end date”
Award is closed out31 May 2031in 1686 days
award ending 2031-01-31 · Research.gov
PAPPG 24-1: “financially closed out 120 days after their expiration date”

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NSF lists this award's end date as 31 January 2031.
NSF rules say the final report is due no later than 120 days after that.
So the final report is due by 31 May 2031.

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Award card

Award number: 2543275
Period of support: 1 Feb 2026 – 31 Jan 2031
Amount: $749,769
Awardee: Johns Hopkins University, Baltimore, MD
Program: Particle Astrophysics/Cosmic P, AMO Experiment/Atomic, Molecul
Directorate: MPS

Abstract

The equivalence principle (EP) states that all massive objects fall at the same rate in a given gravitational field. This idea can be tested by measuring the difference in acceleration of two freely falling objects. Since the EP is the foundation of general relativity, our most precise theory of gravity, EP tests probe the relationship between gravity and the other fundamental forces. In addition, EP tests are…

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