280 citations · 717 across the 22 of their papers we have counts for
24 papers
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…
Localization of Chiral Electromagnetic Waves on Thick Axion Domain Walls
Nemanja Kaloper
We analyze Maxwell theory coupled to an axion domain wall as a spectral boundary value problem. We find that a finite-width axion domain wall generically supports a localized norma…
Chiral Electromagnetic Surface Waves on Chern-Simons Interfaces
Nemanja Kaloper
We show that Maxwell theory with a codimension- Chern-Simons interface supports chiral electromagnetic surface waves on the interface, even when the bulk theory on both sides is…
CMB Birefringence from Vacuum Interfaces
Nemanja Kaloper
Hints of cosmic microwave background polarization rotation ( rad) are commonly attributed to late-time dynamics of ultralight axions. We show that such ult…
Cloaking Cosmic Light
Nemanja Kaloper
Light crossing dark domain walls that source a top form coupled to gauge Chern--Simons terms mixing visible and dark gauge fields generically converts into dark photons. The…
Electromagnetic Couplings of Dark Domain Walls
Nemanja Kaloper
We extend Maxwell electrodynamics with a Chern--Simons coupling to a dark sector top form sourced by domain walls. Cosmic birefringence can arise from a distinct mechanism in which…