Results 31 to 40 of about 151,262 (161)

All-order celestial OPE in the MHV sector

Journal of High Energy Physics, 2023
On-shell kinematics for gluon scattering can be parametrized with points on the celestial sphere; in the limit where these points collide, it is known that tree-level gluon scattering amplitudes exhibit an operator product expansion (OPE)-like structure.
Tim Adamo, Wei Bu, Eduardo Casali, Atul Sharma   +3 more
doaj   +1 more source

Mass perturbation theory in the 2-flavor Schwinger model with opposite masses with a review of the background

Journal of High Energy Physics, 2022
I discuss the 2-flavor Schwinger model with θ = 0 and small equal and opposite fermion masses (or θ = π with equal masses). The massless model has an unparticle sector with unbroken conformal symmetry.
Howard Georgi
doaj   +1 more source

A law of nature?

Open Journal of Ecology, 2011
Is there an overriding principle of nature, hitherto overlooked, that governs all population behavior? A single principle that drives all the regimes observed in nature - exponential-like growth, saturated growth, population decline, population extinction, oscillatory behavior?
openaire   +3 more sources

Hyperbolic vacua in Minkowski space

Journal of High Energy Physics
Families of Lorentz, but not Poincare, invariant vacua are constructed for a massless scalar field in 4D Minkowski space. These are generalizations of the Rindler vacuum with a larger symmetry group. Explicit expressions are given as squeezed excitations
Walker Melton, Filip Niewinski, Andrew Strominger, Tianli Wang   +3 more
doaj   +1 more source

Traversable wormholes via a double trace deformation

Journal of High Energy Physics, 2017
After turning on an interaction that couples the two boundaries of an eternal BTZ black hole, we find a quantum matter stress tensor with negative average null energy, whose gravitational backreaction renders the Einstein-Rosen bridge traversable. Such a
Ping Gao, Daniel Louis Jafferis, Aron C. Wall   +2 more
doaj   +1 more source

Massive celestial fermions

Journal of High Energy Physics, 2020
In an effort to further the study of amplitudes in the celestial CFT (CCFT), we construct conformal primary wavefunctions for massive fermions. Upon explicitly calculating the wavefunctions for Dirac fermions, we deduce the corresponding transformation ...
Sruthi A. Narayanan
doaj   +1 more source

Near-extremal black holes at late times, backreacted

Journal of High Energy Physics, 2019
Black holes display universal behavior near extremality. One such feature is the late-time blowup of derivatives of linearized perturbations across the horizon.
Shahar Hadar
doaj   +1 more source

The effective action of superrotation modes

Journal of High Energy Physics, 2021
Starting from an analysis of four-dimensional asymptotically flat gravity in first order formulation, we show that superrotation reparametrization modes are governed by an Alekseev-Shatashvili action on the celestial sphere.
Kévin Nguyen, Jakob Salzer
doaj   +1 more source

Soft algebras for leaf amplitudes

Journal of High Energy Physics
Celestial MHV amplitudes are comprised of non-distributional leaf amplitudes associated to an AdS3 leaf of a foliation of flat spacetime. It is shown here that the leaf amplitudes are governed by the same infinite-dimensional soft ‘S-algebra’ as their ...
Walker Melton, Atul Sharma, Andrew Strominger   +2 more
doaj   +1 more source

Asymptotic symmetries and electromagnetic memory

Journal of High Energy Physics, 2017
Recent investigations into asymptotic symmetries of gauge theory and gravity have illuminated connections between gauge field zero-mode sectors, the corresponding soft factors, and their classically observable counterparts — so called “memories”. Namely,
Sabrina Pasterski
doaj   +1 more source