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hep-th2026
Positivity in Massive Spin-3/2 EFTs and the Planck-Suppressed Neighbourhood of Supergravity
Jay Desai, Diptimoy Ghosh, Saurabh Pant
It is well known that a strictly massless spin- particle can interact consistently only within supergravity. Recently, positivity arguments have shown that an effective field…
hep-th2026
Massive Exchange and the Sign of the Equilateral Bispectrum
Diptimoy Ghosh, Suvashis Maity, Farman Ullah
We study the inflationary bispectrum generated by the tree-level exchange of a massive hidden-sector scalar during inflation. When the interaction between the inflaton and the hidd…
hep-th2026
Stable Causality and Microcausality for Drummond-Hathrell Photons
Madhukar Deb, Jay Desai, Diptimoy Ghosh
Local superluminal photon propagation arises at in the Drummond Hathrell (DH) effective action obtained by integrating out the electron in QED coupled to gra…