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Article
Open AccessQCD worldsheet axion from the bootstrap
The worldsheet axion plays a crucial role in the dynamics of the Yang-Mills confining flux tubes. According to the lattice measurements, its mass is of order the string tension and its coupling is close to a c...
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Article
Open AccessS-matrix bootstrap for effective field theories: massless pions
We use the numerical S-matrix bootstrap method to obtain bounds on the two leading Wilson coefficients (or low energy constants) of the chiral lagrangian controlling the low-energy dynamics of massless pions. ...
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Article
Open AccessDual S-matrix bootstrap. Part I. 2D theory
Using duality in optimization theory we formulate a dual approach to the S-matrix bootstrap that provides rigorous bounds to 2D QFT observables as a consequence of unitarity, crossing symmetry and analyticity ...
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Article
Open AccessOn the exactness of soft theorems
Soft behaviours of S-matrix for massless theories reflect the underlying symmetry principle that enforces its masslessness. As an expansion in soft momenta, sub-leading soft theorems can arise either due to (I...
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Article
Open AccessThe analytic structure of conformal blocks and the generalized Wilson-Fisher fixed points
We describe in detail the method used in our previous work ar**v:1611.10344 to study the Wilson-Fisher critical points nearby generalized free CFTs, exploiti...
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Article
Open AccessExploring soft constraints on effective actions
We study effective actions for simultaneous breaking of space-time and internal symmetries. Novel features arise due to the mixing of Goldstone modes under the broken symmetries which, in contrast to the usual...
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Article
Open AccessThe free σCFTs
We introduce the conformal field theories that describe the shadows of the lowest dimension composites made out of massless free scalars and fermions in d dimensions. We argue that these theories can be consisten...
