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Soft theorems in de Sitter spacetime
In this paper, we derive a soft photon theorem and a soft gluon theorem in the de Sitter spacetime from the Ward identity of the near cosmological...
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Soft phonon theorems
A variety of condensed matter systems describe gapless modes that can be interpreted as Nambu-Goldstone bosons of spontaneously broken Poincaré...
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Soft theorems for boostless amplitudes
We consider effective field theories (EFTs) of scalar fields with broken Lorentz boosts, which arise by taking the decoupling and flat-space limits...
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Universality of loop corrected soft theorems in 4d
In [1], logarithmic correction to subleading soft photon and soft graviton theorems have been derived in four spacetime dimensions from the ratio of...
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Soft theorems and memory effects at finite temperatures
We study the soft theorems for photons and gravitons at finite temperatures using the thermofield dynamics approach. The soft factors lose...
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Tree level amplitudes from soft theorems
We demonstrate that the tree level amplitudes and the explicit formulas of soft factors can be uniquely determined by soft theorems and the...
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Soft theorems for boosts and other time symmetries
We derive soft theorems for theories in which time symmetries — symmetries that involve the transformation of time, an example of which are Lorentz...
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Perturbative soft photon theorems in de Sitter spacetime
We define a perturbative S-matrix in a local patch of de Sitter background in the limit when the curvature length scale ( ℓ ) is large and study the...
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Soft-Collinear Gravity and Soft Theorems
This chapter reviews the construction of “soft-collinear gravity,” the effective field theory which describes the interaction of collinear and soft...
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Goldstone bosons on celestial sphere and conformal soft theorems
In this paper, we study celestial amplitudes of Goldstone bosons and conformal soft theorems. Motivated by the success of soft bootstrap in momentum...
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Logarithmic soft graviton theorems from superrotation Ward identities
Soft graviton theorems receive one-loop contributions that are logarithmic in the energy of the soft graviton, and which are closely related to tails...
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Geometric soft theorems
We derive a universal soft theorem for every scattering amplitude with at least one massless particle in an arbitrary theory of scalars. Our results...
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Note on NLSM tree amplitudes and soft theorems
This note provides a new point of view for bootstrap** the tree amplitudes of the nonlinear sigma model (NLSM). We use the universality of single...
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S-matrix path integral approach to symmetries and soft theorems
We explore a formulation of the S-matrix in terms of the path integral with specified asymptotic data, as originally proposed by Arefeva, Faddeev,...
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Tree and 1-loop fundamental BCJ relations from soft theorems
We provide a new derivation of the fundamental BCJ relation among double-color-ordered tree amplitudes of bi-adjoint scalar theory, based on the...
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Soft scalars in effective field theory
We derive a soft theorem for a massless scalar in an effective field theory with generic field content using the geometry of field space. This result...
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Celestial soft currents at one-loop and their OPEs
Conformally soft operators and their associated soft theorems on the celestial sphere encode the low energy behaviour of bulk scattering amplitudes....
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Soft limits of the wavefunction in exceptional scalar theories
We study the structure of the flat space wavefunctional in scalar field theories with nonlinearly realized symmetries. These symmetries imply soft...
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Gravitational soft theorem from emergent soft gauge symmetries
We consider and derive the gravitational soft theorem up to the sub-subleading power from the perspective of effective Lagrangians. The emergent soft...