One-loop matrix elements of effective superstring interactions: α′-expanding...
AbstractIn the low-energy effective action of string theories, non-abelian gauge interactions and supergravity are augmented by infinite towers of higher-mass-dimension operators. We propose a new...
View ArticleCompton black-hole scattering for s ≤ 5/2
AbstractQuantum scattering amplitudes for massive matter have received new attention in connection to classical calculations relevant to gravitational-wave physics. Amplitude methods and insights are...
View ArticleThe eikonal operator at arbitrary velocities I: the soft-radiation limit
AbstractObservables related to the real part of the gravitational eikonal, such as the deflection angle and time delay, have been found so far to have a smooth post-Minkowskian (PM) expansion whose...
View ArticleSearching for Kerr in the 2PM amplitude
AbstractThe classical scattering of spinning objects is well described by the spinor-helicity formalism for heavy particles. Using these variables, we derive spurious-pole-free, all-spin...
View ArticleAngular momentum of zero-frequency gravitons
AbstractBy following closely Weinberg’s soft theorem, which captures the 1/ω pole contribution to the amplitude for soft graviton emissions (ω< Λ) on top of an arbitrary background hard process, we...
View ArticleEpilogue: A Personal Memory
AbstractI first entered the grounds of the Frascati National Laboratories in May 1966. I had graduated in physics from University of Rome in February, with a thesis on the “Coalescence and decay of...
View ArticleADONE: A Legacy of Wins and Losses
AbstractADONE’s construction, from its approval in 1963 to the time which led to the first collisions in 1969, includes some of the best years in Touschek’s life. During these years Touschek saw some...
View ArticleString Theory
AbstractI start describing my interaction with Bruno during my thesis and then in his group in Frascati in connection with the calculation of the total cross-section of double bremsstrahlung that, at...
View ArticleThe Making of AdA: Bruno Touschek’s Journey from Widerøe’s Betatron to...
AbstractIn Italy, in 1960, Bruno Touschek conceived and built the first particle-antiparticle collider, called AdA. The different roads and pathways which led to the successful demonstration that it...
View ArticleBruno Touschek and the Physics at Frascati at the Time of AdA and ADONE
AbstractThe physics at Frascati in the years 60–70s is reviewed together with the role played by Bruno Touschek.
View ArticleInelastic exponentiation and classical gravitational scattering at one loop
AbstractWe calculate the inelastic 2 → 3 one-loop amplitude for the scattering of two point-like, spinless objects with generic masses involving the additional emission of a single graviton. We focus...
View ArticleClassical limit of higher-spin string amplitudes
AbstractIt has been shown that a special set of three-point amplitudes between two massive spinning states and a graviton reproduces the linearised stress-energy tensor for a Kerr black hole in the...
View ArticleBootstrapping the relativistic two-body problem
AbstractWe describe the formalism to compute gravitational-wave observables for compact binaries via the effective field theory framework in combination with modern tools from collider physics. We put...
View ArticleThe Operator Formalism and The Dual Resonance Model
AbstractThis chapter is on the Operator Formalism for Dual Resonance Models (DRM). This is an important bridge between DRM and string theory. The starting point is the Bardakci-Ruegg form of the dual...
View ArticleUniversality of loop corrected soft theorems in 4d
AbstractIn [1], logarithmic correction to subleading soft photon and soft graviton theorems have been derived in four spacetime dimensions from the ratio of IR-finite S-matrices. This has been achieved...
View ArticleAn excursion into the string spectrum
AbstractWe propose a covariant technique to excavate physical bosonic string states by entire trajectories rather than individually. The approach is based on Howe duality: the string’s spacetime...
View ArticleGoldstone bosons on celestial sphere and conformal soft theorems
AbstractIn this paper, we study celestial amplitudes of Goldstone bosons and conformal soft theorems. Motivated by the success of soft bootstrap in momentum space and the important role of the soft...
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