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Celestial Holography Revisited.
Phys Rev Lett
December 2024
Dipartimento di Fisica "Ettore Pancini," Università degli Studi di Napoli Federico II, Monte Sant'Angelo, Via Cintia, 80126 Napoli, Italy; INFN, Sezione di Napoli, Monte Sant'Angelo, Via Cintia, 80126 Napoli, Italy; and Scuola Superiore Meridionale, Università degli Studi di Napoli Federico II, Largo San Marcellino 10, 80138 Napoli, Italy.
We revisit the prescription commonly used to define holographic correlators on the celestial sphere of Minkowski space as an integral transform of flat space scattering amplitudes. We propose a new prescription according to which celestial holographic correlators are given by the Mellin transform of bulk time-ordered correlators with respect to the radial direction in the hyperbolic slicing of Minkowski space, which are then extrapolated to the celestial sphere along the hyperbolic directions. This prescription is analogous to the extrapolate definition of holographic correlators in AdS/CFT and, like in AdS, is centered on (off-shell) correlation functions as opposed to (on-shell) S-matrix elements.
View Article and Find Full Text PDFLoops Rescue the No-Boundary Proposal.
Phys Rev Lett
November 2018
Asia Pacific Center for Theoretical Physics, Pohang 37673, South Korea.
New and nontrivial properties of off-shell instantons in loop quantum cosmology show that dynamical signature change naturally cures recently observed problems in the semiclassical path integral of quantum gravity. If left unsolved, these problems would doom any theory of smooth initial conditions of the Universe. The no-boundary proposal, as a specific example of such a theory, is rescued by loops, presenting a rare instance of a fruitful confluence of different approaches to quantum cosmology.
View Article and Find Full Text PDFMatrix algorithms for solving (in)homogeneous bound state equations.
Comput Phys Commun
July 2011
Institut für Physik, Universität Graz, Universitätsplatz 5, 8010 Graz, Austria.
In the functional approach to quantum chromodynamics, the properties of hadronic bound states are accessible via covariant integral equations, e.g. the Bethe-Salpeter equation for mesons.
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