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Title: Soft bootstrap and supersymmetry

Journal Article · · Journal of High Energy Physics (Online)

The soft bootstrap is an on-shell method to constrain the landscape of effective field theories (EFTs) of massless particles via the consistency of the low-energy S-matrix. Given assumptions on the on-shell data (particle spectra, linear symmetries, and low-energy theorems), the soft bootstrap is an efficient algorithm for determining the possible consistency of an EFT with those properties. The implementation of the soft bootstrap uses the recently discovered method of soft subtracted recursion. We derive a precise criterion for the validity of these recursion relations and show that they fail exactly when the assumed symmetries can be trivially realized by independent operators in the effective action. We use this to show that the possible pure (real and complex) scalar, fermion, and vector exceptional EFTs are highly constrained. Next, we prove how the soft behavior of states in a supermultiplet must be related and illustrate the results in extended supergravity. We demonstrate the power of the soft bootstrap in two applications. First, for the \( \mathcal{N} \) = 1 and \( \mathcal{N} \) = 2 CP1 nonlinear sigma models, we show that on-shell constructibility establishes the emergence of accidental IR symmetries. This includes a new on-shell perspective on the interplay between \( \mathcal{N} \) = 2 supersymmetry, low-energy theorems, and electromagnetic duality. We also show that \( \mathcal{N} \) = 2 supersymmetry requires 3-point interactions with the photon that make the soft behavior of the scalar O(1) instead of vanishing, despite the underlying symmetric coset. Second, we study Galileon theories, including aspects of supersymmetrization, the possibility of a vector-scalar Galileon EFT, and the existence of higher-derivative corrections preserving the enhanced special Galileon symmetry. The latter is addressed both by soft bootstrap and by application of double-copy/KLT relations applied to higher-derivative corrections of chiral perturbation theory.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
Grant/Contract Number:
SC0007859; PHY17-48958
OSTI ID:
1610961
Alternate ID(s):
OSTI ID: 1643784
Journal Information:
Journal of High Energy Physics (Online), Vol. 2019, Issue 1; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 67 works
Citation information provided by
Web of Science

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Cited By (9)

The rise of SMEFT on-shell amplitudes journal December 2019
Taming higher-derivative interactions and bootstrapping gravity with soft theorems journal October 2019
Scattering of spinning black holes from exponentiated soft factors text January 2019
The Infrared Structure of Exceptional Scalar Theories text January 2018
Taming higher-derivative interactions and bootstrapping gravity with soft theorems text January 2018
An Algebraic Classification of Exceptional EFTs text January 2019
Soft Bootstrap and Effective Field Theories text January 2019
UV considerations on scattering amplitudes in a web of theories text January 2019
The Duality Between Color and Kinematics and its Applications preprint January 2019

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