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Five-dimensional gravitational Raman scattering: Scalar wave perturbations in Schwarzschild-Tangherlini spacetime / Akhtar, Samim (IMSc, Chennai ; HBNI, Mumbai) ; Bautista, Yilber Fabian (IPhT, Saclay) ; Iossa, Cristoforo (U. Geneva (main) ; CERN) ; Zhou, Zihan (Princeton U.)
In this Letter, we study scalar wave perturbations of arbitrary frequency to the 5D Schwarzschild-Tangherlini black hole (STBH) within general relativity. For the first time, we derive a closed formula for the 5D partial wave gravitational Raman scattering amplitude applicable to a broad class of boundary conditions, expressed in terms of the Nekrasov-Shatashvili (NS) function for the reduced confluent Heun problem. [...]
arXiv:2505.21489.- 2025-10-15 - 15 p. - Published in : Phys. Rev. D 112 (2025) 085018 Fulltext: document - PDF; 2505.21489 - PDF;

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Large charge meets semiclassics in $\mathcal{N}=4$ super Yang-Mills / Brown, Augustus (Queen Mary, U. of London) ; Galvagno, Francesco (Queen Mary, U. of London) ; Grassi, Alba (U. Geneva (main)) ; Iossa, Cristoforo (U. Geneva (main)) ; Wen, Congkao (Queen Mary, U. of London)
We study the large-charge sector of $\mathcal{N}=4$ super Yang-Mills theory (SYM) with $SU(N)$ gauge group by constructing a special class of half-BPS heavy operators, termed "canonical operators". Such operators exhibit remarkable simplicity in the large-charge 't Hooft limit, where the dimension of the operators $\Delta \to \infty$ with $\Delta\, g_{\text{YM}}^2$ held finite. [...]
arXiv:2503.02028; CERN-TH-2025-016; QMUL-PH-25-03.- 2025-06-24 - 49 p. - Published in : JHEP 2506 (2025) 223 Fulltext: 2503.02028 - PDF; document - PDF;

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Matrix models for extremal and integrated correlators of higher rank / Grassi, Alba (U. Geneva (main) ; CERN) ; Iossa, Cristoforo (U. Geneva (main) ; CERN)
We study extremal and integrated correlators of half-BPS operators in four-dimensional $\mathcal{N}=2$ SQCD and $\mathcal{N}=4$ SYM with $SU(3)$ gauge group. [...]
arXiv:2408.07391 ; CERN-TH-2024-134. - 63.
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Black hole bulk-cone singularities / Dodelson, Matthew (CERN) ; Iossa, Cristoforo (Geneva U. ; SISSA, Trieste ; INFN, Trieste) ; Karlsson, Robin (CERN) ; Lupsasca, Alexandru (Vanderbilt U.) ; Zhiboedov, Alexander (CERN)
Lorentzian correlators of local operators exhibit surprising singularities in theories with gravity duals. These are associated with null geodesics in an emergent bulk geometry. [...]
arXiv:2310.15236; CERN-TH-2023-192.- 2024-07-05 - 63 p. - Published in : JHEP 2407 (2024) 046 Fulltext: document - PDF; 2310.15236 - PDF;

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A thermal product formula / Dodelson, Matthew (CERN) ; Iossa, Cristoforo (SISSA, Trieste ; INFN, Trieste) ; Karlsson, Robin (CERN) ; Zhiboedov, Alexander (CERN)
We show that holographic thermal two-sided two-point correlators take the form of a product over quasi-normal modes (QNMs). Due to this fact, the two-point function admits a natural dispersive representation with a positive discontinuity at the location of QNMs. [...]
arXiv:2304.12339; CERN-TH-2023-062.- 2024-01-09 - 63 p. - Published in : JHEP 2401 (2024) 036 Fulltext: document - PDF; 2304.12339 - PDF;

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Holographic thermal correlators from supersymmetric instantons / Dodelson, Matthew (CERN) ; Grassi, Alba (CERN ; HEG, Geneva) ; Iossa, Cristoforo (SISSA, Trieste ; INFN, Trieste) ; Panea Lichtig, Daniel (SISSA, Trieste ; INFN, Trieste) ; Zhiboedov, Alexander (CERN)
We present an exact formula for the thermal scalar two-point function in four-dimensional holographic conformal field theories. The problem of finding it reduces to the analysis of the wave equation on the AdS-Schwarzschild background. [...]
arXiv:2206.07720; CERN-TH-2022-095.- 2023-05-16 - 18 p. - Published in : SciPost Phys. 14 (2023) 116 Fulltext: document - PDF; Publication - PDF; 2206.07720 - PDF; External link: Preprint

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