177 citations · 1.4k across the 38 of their papers we have counts for
28 papers · 1 filter
The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles
Ariel Arza, Deniz Aybas, Shyam Balaji +124
Axions and other very weakly interacting slim particles (WISPs), with masses below 1 GeV, arise naturally in many extensions of the Standard Model of particle physics. In particula…
Classical constant electric fields and the Schwinger effect in de Sitter
Mar Bastero-Gil, Paulo B. Ferraz, António Torres Manso +2
We study constant classical electric fields and the Schwinger effect in de Sitter space, with potential implications for magnetogenesis and inflationary dark matter production. Tre…
Schwinger Current in de Sitter Space
Mar Bastero-Gil, Paulo B. Ferraz, António Torres Manso +2
We study classical background electric fields and the Schwinger effect in de Sitter space. We show that having a constant electric field in de Sitter requires the photon to have a…
Schwinger dark matter production
Mar Bastero-Gil, Paulo B. Ferraz, Lorenzo Ubaldi +1
Building on recently constructed inflationary vector dark matter production mechanisms as well as studies of magnetogenesis, we show that an inflationary dark Schwinger mechanism c…
Super heavy dark matter from inflationary Schwinger production
Mar Bastero-Gil, Paulo B. Ferraz, Lorenzo Ubaldi +1
We consider a simple setup with a dark sector containing dark electrons charged under an abelian gauge symmetry. We show that if the massless dark photon associated to the…
Dark photon dark matter from a rolling inflaton
Mar Bastero-Gil, Jose Santiago, Lorenzo Ubaldi +1
We study in detail a recently proposed mechanism for producing non-thermal dark photon dark matter at the end of inflation in the mass range $μ\,{\rm eV} \lesssim m \lesssim 10\,{\…
Reheating-Induced Axion Dark Matter After Low Scale Inflation
Takeshi Kobayashi, Lorenzo Ubaldi
A kinetic mixing between the axion and the inflaton allows for a production of axion dark matter even if the inflationary Hubble scale is smaller than the zero-temperature axion ma…
Inflaxion Dark Matter
Takeshi Kobayashi, Lorenzo Ubaldi
A new mechanism for producing axion dark matter is proposed. By invoking low-scale inflation and a kinetic mixing between the axion and the inflaton, it is shown that the axion is…
Vector dark matter production at the end of inflation
Mar Bastero-Gil, Jose Santiago, Lorenzo Ubaldi +1
It has been shown that the longitudinal mode of a massive vector boson can be produced by inflationary fluctuations and account for the dark matter content of the Universe. In this…
The Supersymmetric R-Parity Violating Dine-Fischler-Srednicki-Zhitnitsky Axion Model
Stefano Colucci, Herbi K. Dreiner, Lorenzo Ubaldi
We propose a complete R-parity violating supersymmetric model with baryon triality that contains a Dine-Fischler-Srednicki-Zhitnitsky axion chiral superfield. We parametrize supers…
Combined explanations of B-physics anomalies: the sterile neutrino solution
Aleksandr Azatov, Daniele Barducci, Diptimoy Ghosh +2
In this paper we provide a combined explanation of charged- and neutral-current -physics anomalies assuming the presence of a light sterile neutrino which contributes to t…
Dynamics of Relaxed Inflation
Walter Tangarife, Kohsaku Tobioka, Lorenzo Ubaldi +1
The cosmological relaxation of the electroweak scale has been proposed as a mechanism to address the hierarchy problem of the Standard Model. A field, the relaxion, rolls down its…
Relaxed Inflation
Walter Tangarife, Kohsaku Tobioka, Lorenzo Ubaldi +1
We present an effective model where the inflaton is a relaxion that scans the Higgs mass and sets it at the weak scale. The dynamics consist of a long epoch in which inflation is d…
Accidental Peccei-Quinn symmetry protected to arbitrary order
Luca Di Luzio, Enrico Nardi, Lorenzo Ubaldi
A gauge theory for a scalar multiplet transforming in the bi-fundamental representation preserves, for , an accidental symmetry…
Precision tools and models to narrow in on the 750 GeV diphoton resonance
Florian Staub, Peter Athron, Lorenzo Basso +8
The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate…
Is the Relaxion an Axion?
Rick S. Gupta, Zohar Komargodski, Gilad Perez +1
We consider the recently proposed cosmological relaxation mechanism where the hierarchy problem is ameliorated, and the electroweak scale is dynamically selected by a slowly rollin…
Heavy concerns about the light axino explanation of the 3.5 keV X-ray line
Stefano Colucci, Herbi K. Dreiner, Florian Staub +1
An unidentified 3.5 keV line from X-ray observations of galaxy clusters has been reported recently. Although still under scrutiny, decaying dark matter could be responsible for thi…
Dynamical generation of the Peccei-Quinn scale in gauge mediation
Guido Festuccia, Toby Opferkuch, Lorenzo Ubaldi
The Peccei-Quinn (PQ) mechanism provides an elegant solution to the strong CP problem. However astrophysical constraints on axions require the PQ breaking scale to be far higher th…
Closing in on singlet scalar dark matter: LUX, invisible Higgs decays and gamma-ray lines
Lei Feng, Stefano Profumo, Lorenzo Ubaldi
We study the implications of the Higgs discovery and of recent results from dark matter searches on real singlet scalar dark matter. The phenomenology of the model is defined by on…
From the unification scale to the weak scale: A self consistent supersymmetric Dine-Fischler-Srednicki-Zhitnitsky axion model
Herbi K. Dreiner, Florian Staub, Lorenzo Ubaldi
The distinguishing feature of the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axion is that it couples to the electroweak Higgs fields. There is thus an immediate connection between…
White dwarfs constraints on dark sector models with light particles
Lorenzo Ubaldi
The white dwarf luminosity function is well understood in terms of standard model physics and leaves little room for exotic cooling mechanisms related to the possible existence of…
Supernova Constraints on MeV Dark Sectors from e+ e- Annihilations
Herbert K. Dreiner, Jean-François Fortin, Christoph Hanhart +1
Theories with dark forces and dark sectors are of interest for dark matter models. In this paper we find the region in parameter space that is constrained by supernova cooling cons…
On baryogenesis from dark matter annihilation
Nicolas Bernal, Stefano Colucci, Francois-Xavier Josse-Michaux +2
We study in detail the conditions to generate the baryon asymmetry of the universe from the annihilation of dark matter. This scenario requires a low energy mechanism for thermal b…
White Dwarfs constrain Dark Forces
Herbert K. Dreiner, Jean-François Fortin, Jordi Isern +1
The white dwarf luminosity function, which provides information about their cooling, has been measured with high precision in the past few years. Simulations that include well know…