Monica Pate, From Asymptotic Symmetries to Celestial Holography (12:30 PM - 1:30 PM)

Amr Ahmadain, String theory in off-shell backgrounds and black hole entropy (4:00 PM - 5:00 PM)

-- Abstract: String backgrounds solve Einstein's equations. The worldsheet theory is a CFT with zero central charge. This is the definition of on-shell string theory. In off-shell string theory, on the other hand, conformal invariance on the worldsheet is explicitly broken. It follows that the worldsheet theory is a QFT rather than a CFT. This means that, in addition to the Lagrangian, a UV cutoff with dimensions of length must be specified. While Tseytlin's off-shell formalism can be used at arbitrary genus g, the treatment of the sphere diagram (genus-0) is particularly subtle. In particular, on the sphere, Tseytlin does not deal with the SL(2,C) group by fixing 3 points, as this prescription does not properly extend to the off-shell case. Instead, at the n-th order of perturbation theory, Tseytlin integrates all n vertex operators over the sphere to obtain an n-point correlator. This introduces log divergences as (n-1) points come together on the sphere. To obtain the correct spherical string amplitude Z_0, Tseytlin's formalism therefore differentiates rather than divides by the log of the UV cutoff. In this talk, I will explain Tseytlin’s formalism for constructing classical off-shell effective actions and provide a general proof that it gives the correct equations of motion, to all orders in perturbation theory and α′. I will then explain how the classical off-shell action was used by Susskind and Uglum to calculate the classical black hole entropy on a conical manifold in Rindler background.

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ASTRO Journal Club (12:30 PM - 1:30 PM)

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, No HEP Seminar (2:00 PM - 3:30 PM)

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Anthony Pullen, Probing Galaxy Physics with Line Intensity Mapping (4:00 PM - 5:30 PM)

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, Grad Pheno Journal Club (3:30 PM - 4:30 PM)

Catherine Zucker, Revealing the Star Formation History of our Solar Neighborhood (2:00 PM - 3:00 PM)

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Zare, HET Discussion Session (3:00 PM - 5:00 PM)

Alexander Penin, What becomes of vortices when they grow giant? (2:00 PM - 3:30 PM)

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Sarah Kendrew, JWST Launch, Commissioning and Early Science (4:00 PM)

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Hirosi Ooguri, Symmetry-Resolved Density of States (2:00 PM - 3:00 PM)

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Julianne Dalcanton, The Value of High Resolution Studies of the Nearest Galaxies (2:00 PM - 3:00 PM)

Spenta Wadia, A Microscopic Model of Black Hole Evaporation in 2-dim. (4:00 PM - 5:00 PM)

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Ian Moult, Conformal Colliders Meet the LHC (2:00 PM - 3:00 PM)

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, Quantum-Group Group Meeting (1:00 PM - 2:15 PM)

Arushi Bodas, Stochastic gravitational wave anisotropies: a new window into multi-field inflation (2:00 PM - 3:00 PM)

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, Grad Pheno Journal Club (3:30 PM - 4:30 PM)

Alexey Milekhin, Measurement-induced phase transition in teleportation and wormholes (4:00 PM - 5:00 PM)

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Zare, HET Discussion Session (3:00 PM - 5:00 PM)

Mitrajyoti Ghosh, The 2-neutrino force and where to find it (2:00 PM - 3:00 PM)

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Yuri Levin, Resonant Friction on discs in galactic nuclei (2:00 PM - 3:00 PM)

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Shu-Heng Shao, Non-invertible Symmetries in Nature (2:00 PM - 3:00 PM)

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Chandralekha Singh, Facilitating Thinking and Learning In and Beyond the Physics Classrooms using Research-based Approaches (4:00 PM)

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