Conveners
Formal
- Luca Martucci (University of Padua)
Among various predictions of string compactifications, axions hold a pivotal role, as they provide a unique avenue to tie UV physics to experiments.
Most experimental setups aim to detect a signal using the direct coupling between the axion and the Standard Model.
If string axions coupled to Abelian gauge fields undergo slow-roll during inflation, they produce a multi-peak GW signal whose...
We provide a gauge-invariant decomposition of Feynman amplitudes in spontaneously broken gauge theories. Amplitudes are graded according to the number $l_h$ of internal lines of the propagating gauge-invariant field that represents the physical Higgs scalar and the number $l_v$ of internal lines of the propagating gauge-invariant field describing the massive vector meson.
Slavnov-Taylor...
We propose a novel $R_\xi$ gauge in the five-vector (5V) framework within the Abelian Higgs model. In the Cartesian basis of the complex Higgs field, the 5V $R_\xi$ gauge ensures non-divergent tree-level amplitudes for each Feynman diagram in the high-energy limit. This framework pinpoints the origin of high-energy divergences in tree-level amplitudes for each diagram, providing a criterion...
We present recent advances in functional techniques beyond one-loop order suitable for precision matching and running computations in the effective field theories. Expanding the generating functional and quantum effective action up to two-loop order, we analyze how the relevant terms can be evaluated. The formalism is then generalized to theories with mixed spin as well as gauge fields, where...
In the context of $f(R)$ gravity, as well as other extended theories of gravity, the correct counting of globally well-defined linear dynamical modes (i.e. gravitational-wave polarisations) has recently drawn a vivid interest. In this talk, we present a consistent approach shedding light on such issues for both so-called degenerate and non-degenerate $f(R)$ models embedded in Minkowski and de...
