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hep-th2026
Wading the String Bog: CMB Birefringence in the Swampland
Guido D'Amico, Nemanja Kaloper, Alexander Westphal
We point out that observations of cosmic birefringence may provide direct experimental tests of Swampland conjectures. Ultralight scalar field birefringence mechanisms are constrai…
hep-ph2026
Very-High-Frequency Gravitational Waves from Multi-Monodromy Inflation
Guido D'Amico, Andrew A. Geraci, Nemanja Kaloper +1
We show that in multi-stage axion monodromy inflation an interruption near the end of the penultimate stage can lead to a spike in the gravitational wave background. These gravitat…