Zobrazeno 1 - 10
of 192
pro vyhledávání: '"Pomarol, Alex"'
We study nonthermal production of heavy dark matter from the dynamics of the background scalar field during a first-order phase transition, predominantly from bubble collisions. In scenarios where bubble walls achieve runaway behavior and get boosted
Externí odkaz:
http://arxiv.org/abs/2403.03252
Autor:
Pomarol, Alex, Salas, Lindber
We consider conformal transitions arising from the merging of IR and UV fixed points, expected to occur in QCD with a large enough number of flavors. We study the smoothness of physical quantities across this transition, being mostly determined by th
Externí odkaz:
http://arxiv.org/abs/2312.08332
The bootstrap approach (demanding consistency conditions to scattering amplitudes) has shown to be quite powerful to tightly constrain gauge theories at large $N_c$. We extend previous analysis to scattering amplitudes involving pions and external ga
Externí odkaz:
http://arxiv.org/abs/2307.04729
The simple analytic structure of meson scattering amplitudes in the large-$N_c$ limit, combined with positivity of the spectral density, provides precise predictions on low-energy observables. Building upon previous studies, we explore the allowed re
Externí odkaz:
http://arxiv.org/abs/2211.12488
We show how to simplify the calculation of the finite contributions from heavy particles to EFT Wilson coefficients by using on-shell methods. We apply the technique to the one-loop calculation of $g-2$ and $H\gamma\gamma$, showing how finite contrib
Externí odkaz:
http://arxiv.org/abs/2201.10572
Lepton Flavor Violating (LFV) observables such as $\mu\to e\gamma$, $\mu\to 3e$ and $\mu N \to eN$ are among the best probes for new physics at the TeV scale. In the near future the bounds on these observables will improve by many orders of magnitude
Externí odkaz:
http://arxiv.org/abs/2112.12131
Autor:
Gherghetta, Tony, Pomarol, Alex
Small instantons can play an important role in Yang-Mills theories whose gauge couplings are sizeable at small distances. An interesting class of theories where this could occur is in weakly-gauged holographic models (dual to Yang-Mills theories inte
Externí odkaz:
http://arxiv.org/abs/2110.01762
On-shell amplitude methods have proven to be extremely efficient for calculating anomalous dimensions. We further elaborate on these methods to show that, by the use of an angular momentum decomposition, the one-loop anomalous dimensions can be reduc
Externí odkaz:
http://arxiv.org/abs/2010.13809
On-shell amplitude methods allow to derive one-loop renormalization effects from just tree-level amplitudes, with no need of loop calculations. We derive a simple formula to obtain the anomalous dimensions of higher-dimensional operators from a produ
Externí odkaz:
http://arxiv.org/abs/2005.07129
We calculate a new contribution to the axion mass that arises from gluons propagating in a 5th dimension at high energies. By uplifting the 4D instanton solution to five dimensions, the positive frequency modes of the Kaluza-Klein states generate a p
Externí odkaz:
http://arxiv.org/abs/2001.05610