Searches for a Disformal Scalar 2f Clock Signature in GNSS, GPS, and Pulsar-Timing Data

Key Points

• The aim is to find observable 2f harmonic clock signatures predicted by a disformal scalar theory.
• Analyzed GNSS, GPS, and pulsar-timing data for 2f harmonic signals.
• Derived observable based on conformal-plus-disformal scalar effective field theory (EFT).
• Estimated optical-clock projection under specific assumptions.
• No evidence for the 2f harmonic clock signature was found in the analyzed data.
• Provided quantitative bounds contingent on scalar field's relationship with local dark matter density.