String (Gravi)photons, “Dark Brane Photons”, Holography and the Hypercharge Portal
نویسندگان
چکیده
The mixing of graviphotons and dark brane photons to the Standard Model hypercharge is analyzed in full generality, weakly-coupled string theory. Both direct as well effective terms that provide after inclusion SM corrections are estimated lowest order. results compared with Effective Field Theory (EFT) couplings, originating a hidden large-N theory coupled where composite. typically subleading generic EFT couplings. case holographic also analyzed, providing suppressed hypercharge.
منابع مشابه
D̄-brane as Dark Matter in Warped String Compactification
It is pointed out that in the warped string compactification, motion of D̄-branes near the bottom of a throat behaves like dark matter. Several scenarios for production of the dark matter are suggested, including one based on the D/D̄ interaction at the late stage of D/D̄ inflation. UTAP-525, RESCEU-8/05
متن کاملHolography and Stiff-matter on the Brane
Recently, Verlinde noted a surprising similarity between Friedmann equation governing radiation dominated universe and Cardy’s entropy formula in conformal field theory. In this note, we study a brane-universe filled with radiation and stiff-matter. We analyze Friedmann equation in this context and compare our results with Cardy’s entropy formula.
متن کاملString Unification, Higher-Level Gauge Symmetries, and Exotic Hypercharge Normalizations
We explore the extent to which string theories with higher-level gauge symmetries and non-standard hypercharge normalizations can reconcile the discrepancy between the string unification scale and the GUT scale extrapolated from the Minimal Supersymmetric Standard Model (MSSM). We determine the phenomenologically allowed regions of (kY , k2, k3) parameter space, and investigate the proposal tha...
متن کاملHolography of D-Brane Reconnection
Gukov, Martinec, Moore and Strominger found that the D1-D5-D5′ system with the D5-D5′ angle at 45 degrees admits a deformation ρ preserving supersymmetry. Under this deformation, the D5-branes and D5’-branes reconnect along a single special Lagrangian manifold. We construct the near-horizon limit of this brane setup (for which no supergravity solution is currently known), imposing the requisite...
متن کاملHolography and Applied String Theory
Until the middle of the 1990’s, string theory had a reputation for being a rather ambitious formalism that, while being the most promising candidate for unifying gravity with the Standard Model, had provided few concrete, testable predictions or applications. This changed following Maldacena’s proposal, the AdS/CFT correspondence or gauge/gravity duality [36, 2], in 1997; building on holographi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Fortschritte der Physik
سال: 2021
ISSN: ['0015-8208', '1521-3978']
DOI: https://doi.org/10.1002/prop.202100034