411 citations · 1.7k across the 22 of their papers we have counts for
13 papers · 1 filter
Freeze-in Dark Matter Perturbations are Adiabatic
Davide Racco, Antonio Riotto
We show that the large-scale perturbations in the dark matter generated by the freeze-in mechanism are only of adiabatic nature. The freeze-in mechanism is not at odds with the cur…
Dark QED from Inflation
Asimina Arvanitaki, Savas Dimopoulos, Marios Galanis +3
One contribution to any dark sector's abundance comes from its gravitational production during inflation. If the dark sector is weakly coupled to the inflaton and the Standard Mode…
Causal gravitational waves as a probe of free streaming particles and the expansion of the Universe
Anson Hook, Gustavo Marques-Tavares, Davide Racco
The low frequency part of the gravitational wave spectrum generated by local physics, such as a phase transition or parametric resonance, is largely fixed by causality, offering a…
Maximal axion misalignment from a minimal model
Junwu Huang, Amalia Madden, Davide Racco +1
The QCD axion is one of the best motivated dark matter candidates. The misalignment mechanism is well known to produce an abundance of the QCD axion consistent with dark matter for…
Minimal signatures of the Standard Model in non-Gaussianities
Anson Hook, Junwu Huang, Davide Racco
We show that the leading coupling between a shift symmetric inflaton and the Standard Model fermions leads to an induced electroweak symmetry breaking due to particle production du…
Searches for other vacua II: A new Higgstory at the cosmological collider
Anson Hook, Junwu Huang, Davide Racco
The detection of an oscillating pattern in the bispectrum of density perturbations could suggest the existence of a high-energy second minimum in the Higgs potential. If the Higgs…
Implications of the detection of primordial gravitational waves for the Standard Model
G. Franciolini, G. F. Giudice, D. Racco +1
The detection of primordial gravitational waves would not only have extraordinary implications for our understanding of early cosmology, but would also give non-trivial constraints…
Primordial Black Holes from Higgs Vacuum Instability: Avoiding Fine-tuning through an Ultraviolet Safe Mechanism
José Ramón Espinosa, Davide Racco, Antonio Riotto
We have recently proposed the idea that dark matter in our universe is formed by primordial black holes generated by Standard Model Higgs fluctuations during inflation and thanks t…
A Cosmological Signature of the SM Higgs Instability: Gravitational Waves
José Ramón Espinosa, Davide Racco, Antonio Riotto
A fundamental property of the Standard Model is that the Higgs potential becomes unstable at large values of the Higgs field. For the current central values of the Higgs and top ma…
A Cosmological Signature of the Standard Model Higgs Vacuum Instability: Primordial Black Holes as Dark Matter
J. R. Espinosa, D. Racco, A. Riotto
For the current central values of the Higgs and top masses, the Standard Model Higgs potential develops an instability at a scale of the order of GeV. We show that a cosm…
On Dark Matter Interactions with the Standard Model through an Anomalous
Ahmed Ismail, Andrey Katz, Davide Racco
We study electroweak scale Dark Matter (DM) whose interactions with baryonic matter are mediated by a heavy anomalous . We emphasize that when the DM is a Majorana particle, it…
The 750 GeV Diphoton excess, Dark Matter and Constraints from the IceCube experiment
Enrico Morgante, Davide Racco, Mohamed Rameez +1
Recent LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. Interestingly, this new particle might be both CP odd and play the role…
Robust collider limits on heavy-mediator Dark Matter
Davide Racco, Andrea Wulzer, Fabio Zwirner
We discuss how to consistently use Effective Field Theories (EFTs) to set universal bounds on heavy-mediator Dark Matter at colliders, without prejudice on the model underlying a g…