String (gravi)photons, "dark brane photons", holography and the hypercharge portal

APC; Dario Consoli (Vienna U.); Elias Kiritsis (Crete U.; INFN; Massimo Bianchi (Rome U.; Paris); Pascal Anastasopoulos (Vienna U.); Rome2); Tor Vergata

String (gravi)photons, "dark brane photons", holography and the hypercharge portal

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arxiv 2010.07320 v3 pith:RNDVUXTT submitted 2020-10-14 hep-ph hep-th

Pascal Anastasopoulos (Vienna U.) , Massimo Bianchi (Rome U. , Tor Vergata , INFN , Rome2) , Dario Consoli (Vienna U.) , Elias Kiritsis (Crete U. , APC

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keywords theorymixinghyperchargephotonsstringtermsanalyzedbrane

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The mixing of graviphotons and dark brane photons to the Standard Model hypercharge is analyzed in full generality, in weakly-coupled string theory. Both the direct mixing as well as effective terms that provide mixing after inclusion of SM corrections are estimated to lowest order. The results are compared with Effective Field Theory (EFT) couplings, originating in a hidden large-N theory coupled to the SM. The string theory mixing terms are typically subleading compared with the generic EFT couplings. The case where the hidden theory is a holographic theory is also analyzed, providing also suppressed mixing terms to the SM hypercharge.

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The String Theory Photoverse
hep-th 2025-10 conditional novelty 6.0 of 10

Massless string-theory hidden photons acquire dimension-six dipole couplings to SM fermions with suppression scale Λ = αM_s, converting dipole measurements into constraints on the string scale.

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