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21
Semiclassical Virasoro symmetry of the quantum gravity Smatrix,” JHEP 1408
, 2014
"... It is shown that the treelevel Smatrix for quantum gravity in fourdimensional Minkowski space has a Virasoro symmetry which acts on the conformal sphere at null infinity. ar X iv ..."
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It is shown that the treelevel Smatrix for quantum gravity in fourdimensional Minkowski space has a Virasoro symmetry which acts on the conformal sphere at null infinity. ar X iv
Diagrammatic insights into nexttosoft corrections, Phys
 Lett. B737 (2014) 216, arXiv:1406.7184 – 25
"... We confirm recently proposed theorems for the structure of nexttosoft corrections in gauge and gravity theories using diagrammatic techniques, first developed for use in QCD phenomenology. Our aim is to provide a useful alternative insight into the nexttosoft theorems, including tools that may b ..."
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We confirm recently proposed theorems for the structure of nexttosoft corrections in gauge and gravity theories using diagrammatic techniques, first developed for use in QCD phenomenology. Our aim is to provide a useful alternative insight into the nexttosoft theorems, including tools that may be useful for further study. We also shed light on a recently observed double copy relation between nexttosoft corrections in the gauge and gravity cases. 1
Subleading Soft Factor for String Disk Amplitudes
"... We investigate the behavior of superstring disk scattering amplitudes in the presence of a soft external momentum at finite string tension. We prove that there are no α′corrections to the field theory form of the subleading soft factor S(1). At the end of this work, we also comment on the possibili ..."
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We investigate the behavior of superstring disk scattering amplitudes in the presence of a soft external momentum at finite string tension. We prove that there are no α′corrections to the field theory form of the subleading soft factor S(1). At the end of this work, we also comment on the possibility to find the corresponding subleading soft factors in closed string theory using our result and the KLT relations. 1
A Note on Soft Factors for Closed String Scattering
, 2014
"... In this note, it is shown that closed string graviton scattering amplitudes obey the same subleading soft limit as field theory graviton scattering amplitudes. The result is derived using a combination of recent results and methods including the subleading soft expansion for type I open string gluon ..."
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In this note, it is shown that closed string graviton scattering amplitudes obey the same subleading soft limit as field theory graviton scattering amplitudes. The result is derived using a combination of recent results and methods including the subleading soft expansion for type I open string gluon disk scattering amplitudes, the single value projection for multiple ζ values, and the KLT relations in field and string theory.
Soft theorems from effective field theory
, 2015
"... The singular limits of massless gauge theory amplitudes are described by an effective theory, called softcollinear effective theory (SCET), which has been applied most successfully to make allorders predictions for observables in collider physics and weak decays. At treelevel, the emission of a ..."
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The singular limits of massless gauge theory amplitudes are described by an effective theory, called softcollinear effective theory (SCET), which has been applied most successfully to make allorders predictions for observables in collider physics and weak decays. At treelevel, the emission of a soft gauge boson at subleading order in its energy is given by the LowBurnettKroll theorem, with the angular momentum operator acting on a lowerpoint amplitude. For well separated particles at treelevel, we prove the LowBurnettKroll theorem using matrix elements of subleading SCET Lagrangian and operator insertions which are individually gauge invariant. These contributions are uniquely determined by gauge invariance and the reparametrization invariance (RPI) symmetry of SCET. RPI in SCET is connected to the infinitedimensional asymptotic symmetries of the Smatrix. The LowBurnettKroll theorem is generically spoiled by onshell corrections, including collinear loops and collinear emissions. We demonstrate this explicitly both at treelevel and at oneloop. The effective theory correctly describes these configurations, and we generalize the LowBurnettKroll theorem into a new oneloop subleading soft theorem for amplitudes. Our analysis is presented in a manner that illustrates the wider utility of using effective theory techniques to understand the perturbative Smatrix.
2D KacMoody Symmetry of 4D YangMills Theory
"... All intext references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately. ..."
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All intext references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.
HigherDimensional Supertranslations and Weinberg's Soft Graviton Theorem
"... Weinberg's soft graviton theorem in 2m + 2 dimensions is reexpressed as a Ward identity for the gravitational Smatrix. The corresponding asymptotic symmetries are identified with 2m + 2dimensional supertranslations. An alternate derivation of these asymptotic symmetries as diffeomorphisms w ..."
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Weinberg's soft graviton theorem in 2m + 2 dimensions is reexpressed as a Ward identity for the gravitational Smatrix. The corresponding asymptotic symmetries are identified with 2m + 2dimensional supertranslations. An alternate derivation of these asymptotic symmetries as diffeomorphisms which preserve finiteenergy boundary conditions at null infinity and act nontrivially on physical data is given. Our results differ from those of previous analyses whose stronger boundary conditions precluded supertranslations for d > 4. We find for all even d that supertranslation symmetry is spontaneously broken in the conventional vacuum and identify soft gravitons as the corresponding Goldstone bosons.