TASI Lectures on Scattering Amplitudes

By C. Cheung. Anticipating the Next Discoveries in Particle Physics, 2017

140 citations recorded by the source corpus.

These lectures are a brief introduction to scattering amplitudes. We begin with a review of basic kinematical concepts like the spinor helicity formalism, followed by a tutorial on bootstrapping tree-level scattering amplitudes. Afterwards, we discuss on-shell recursion relations and soft theorems, emphasizing their broad applicability to gravity, gauge theory, and effective field theories. Lastly, we report on some of the new field theoretic structures which have emerged from the on-shell picture, focusing primarily on color-kinematics duality.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/10adaba4cf4f53e32f753eb2ca19881ad1cd24b6

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. E. Pajer
2. D. Baumann
3. A. Luna
4. H. Goodhew
5. Sadra Jazayeri
6. D. O’Connell
7. A. Joyce
8. Hayden Lee

In Nuclear and High Energy Physics

1. E. Pajer
2. A. Luna
3. D. O’Connell
4. Isobel Nicholson
5. D. Baumann
6. H. Goodhew
7. Sadra Jazayeri
8. R. Monteiro

Citations in the corpus

• The Cosmological Bootstrap: Spinning correlators from symmetries and factorization (2020, methodology): “The striking simplicity has motivated the modern “amplitudes bootstrap,” in which the structure of scattering amplitudes is determined not by complex computations, but by much simpler and more fundamental consistency requirements [45, 46].”
• The Cosmological Optical Theorem (2020, methodology): “This is the case for example with on-shell methods for amplitudes: Lorentz invariance, unitarity and locality uniquely fix all possible three-particle amplitudes, which in turn can be used to derive higher-particle amplitudes using recursion relations in many interesting classes of theories (for rev”
• Building a boostless bootstrap for the bispectrum (2020, background): “In much the same way that perturbative calculations in QFT obscure some of the structure and simplicity of scattering amplitudes [2, 3, 4], the standard in-in formalism employed to compute correlators in cosmology fails to take advantage of some powerful general properties of the final result.”
• Type D spacetimes and the Weyl double copy (2018, background): “The double copy is reviewed in, for example, [42–44].”
• The cosmological bootstrap: inflationary correlators from symmetries and singularities (2018, unknown): “[38–40].”