Publications (38)
Inverse Seesaw, dark matter and the Hubble tension
Enrique Fernandez-Martinez, Mathias Pierre, Emanuelle Pinsard +1
We consider the inverse Seesaw scenario for neutrino masses with the approximate Lepton number symmetry broken dynamically by a scalar with Lepton number two. We show that the Majo…
Cosmology With a Very Light Gauge Boson
Miguel Escudero, Dan Hooper, Gordan Krnjaic +1
In this paper, we explore in detail the cosmological implications of an abelian gauge extension of the Standard Model featuring a light and weakly coupled . Such a…
A New Window into Gravitationally Produced Scalar Dark Matter
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
Conventional scenarios of purely gravitationally produced dark matter with masses below the Hubble parameter at the end of inflation are in tension with Cosmic Microwave Background…
Monomial warm inflation revisited
Guillermo Ballesteros, Alejandro Pérez RodrÃguez, Mathias Pierre
We revisit the idea that the inflaton may have dissipated part of its energy into a thermal bath during inflation, considering monomial inflationary potentials and three different…
Sensitivity of CTA to dark matter signals from the Galactic Center
Mathias Pierre, Jennifer M. Siegal-Gaskins, Pat Scott
(abridged) The Galactic Center is one of the most promising targets for indirect detection of dark matter with gamma rays. We investigate the sensitivity of the upcoming Cherenkov…
Scrutinizing a di-photon resonance at the LHC through Moscow zero
Giorgio Arcadi, Pradipta Ghosh, Yann Mambrini +1
The ATLAS and CMS collaborations have recently released their new analyses of the diphoton searches. We look in detail the consequences of their results deriving strong constraints…
A Dark Matter Interpretation of the ANITA Anomalous Events
Lucien Heurtier, Yann Mambrini, Mathias Pierre
The ANITA collaboration recently reported the detection of two anomalous upward-propagating extensive air showers exiting the Earth with relatively large emergence angles and energ…
A Model of Metastable EeV Dark Matter
Emilian Dudas, Lucien Heurtier, Yann Mambrini +2
We propose a model where a long-lived pseudoscalar EeV particle can be produced with sufficient abundance so as to account for the cold dark matter density, despite having a Planck…
Vector SIMP dark matter with approximate custodial symmetry
Soo-Min Choi, Hyun Min Lee, Yann Mambrini +1
We consider a novel scenario for Vector Strongly Interacting Massive Particle (VSIMP) dark matter with local symmetry in the dark sector. Similarly to the…
Freezing-in dark matter through a heavy invisible
Gautam Bhattacharyya, MaÃra Dutra, Yann Mambrini +1
We demonstrate that in a class of the extension of the Standard Model (SM), under which all the Standard Model matter fields are uncharged and the additional neutral gauge…
portal to Chern-Simons Dark Matter
Giorgio Arcadi, Pradipta Ghosh, Yann Mambrini +2
We study the phenomenological credibility of a vectorial dark matter, coupled to a portal through Chern-Simons interaction. We scrutinize two possibilities of connecting a $Z'…
Gravitational wave signatures of post-fragmentation reheating
Marcos A. G. Garcia, Mathias Pierre
After cosmic inflation, coherent oscillations of the inflaton field about a monomial potential result in an expansion phase characterized by a stiff equation-of-st…
Scalar dark matter production from the inflaton
Mathias Pierre
A curved space-time is known to act as a source for particle production in environments where gravity plays a significant role. We explore this effect in a minimal setup of cosmic…
Higgs-boson visible and invisible constraints on hidden sectors
Thomas Biekötter, Mathias Pierre
We investigate the impact of interactions between hidden sectors and the discovered Higgs boson , allowing for additional invisible decay channels of . We perform…
Non-Gaussian tails without stochastic inflation
Guillermo Ballesteros, Thomas Konstandin, Alejandro Pérez RodrÃguez +2
We show, both analytically and numerically, that non-Gaussian tails in the probability density function of curvature perturbations arise in ultra-slow-roll inflation from the …
Disformal Dark Matter
Philippe Brax, Kunio Kaneta, Yann Mambrini +1
We generalize dark matter production to a two-metric framework whereby the physical metric, which couples to the Standard Model (SM), is conformally and/or disformally related to t…
Vector SIMP dark matter
Soo-Min Choi, Yonit Hochberg, Eric Kuflik +4
Strongly Interacting Massive Particles (SIMPs) have recently been proposed as light thermal dark matter relics. Here we consider an explicit realization of the SIMP mechanism in th…
Dark matter in GUT inspired portal scenarios
Mathias Pierre
We consider simple dark matter extensions of the standard model in portal scenarios inspired by grand unification theory constructions and we study the phenomenology of…
The Waning of the WIMP: Endgame?
Giorgio Arcadi, David Cabo-Almeida, MaÃra Dutra +7
Weakly Interacting Massive Particles (WIMPs) continue to be considered some of the best-motivated Dark Matter (DM) candidates. No conclusive signal, despite an extensive search pro…
Impact of Dark Matter Direct and Indirect Detection on Simplified Dark Matter Models
Giorgio Arcadi, Yann Mambrini, Mathias Pierre
We discuss simple extensions of the Standard Model featuring a (fermionic) stable DM candidate interacting with SM fermions through a mediator. These kind of models offer a…
Re-opening dark matter windows compatible with a diphoton excess
Giorgio Arcadi, Pradipta Ghosh, Yann Mambrini +1
We investigate a simple setup in which an excess in the di-photon invariant mass distribution around GeV, as seen by the ATLAS and CMS collaborations, is originated through a…
Intrinsic non-Gaussianity of ultra slow-roll inflation
Guillermo Ballesteros, Jesús GambÃn Egea, Thomas Konstandin +3
We study the non-Gaussian tail of the curvature fluctuation, , in an inflationary scenario with a transient ultra slow-roll phase that generates a localized large enhancement o…
Scalar Dark Matter Production from Preheating and Structure Formation Constraints
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
We investigate the out-of-equilibrium production of scalar dark matter (DM) from the inflaton condensate during inflation and reheating. We assume that this scalar couples only to…
Fermion (non)reheating with a quartic inflaton potential
Nabeen Bhusal, M. Ernesto Chávez M., Ernesto Chávez M. +3
Any viable inflationary model must account for reheating of the universe prior to the onset of primordial nucleosynthesis. In this work, we study the (p)reheating mechanism for an…
Dark Matter candidates in a Type-II radiative neutrino mass model
Roberto A. Lineros, Mathias Pierre
We explore the connection between Dark Matter and neutrinos in a model inspired by radiative Type-II seessaw and scotogenic scenarios. In our model, we introduce new electroweakly…
The Waning of the WIMP? A Review of Models, Searches, and Constraints
Giorgio Arcadi, MaÃra Dutra, Pradipta Ghosh +5
Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. In light of no conclusive detection signal yet despite an extensive search program…
Dark Matter phenomenology : from simplified WIMP models to refined alternative solutions
Mathias Pierre
One of the most puzzling problems of modern physics is the identification of the nature a non-relativistic matter component present in the universe, contributing to more than 25$\%…
Flavourful portal for vector-like neutrino Dark Matter and
Adam Falkowski, Stephen F. King, Elena Perdomo +1
We discuss a flavourful portal model with a coupling to fourth-family singlet Dirac neutrino dark matter. In the absence of mixing, the is fermiophobic, having no couplin…
Primordial black holes and gravitational waves from dissipation during inflation
Guillermo Ballesteros, Marcos A. G. GarcÃa, Alejandro Pérez RodrÃguez +2
We study the generation of a localized peak in the primordial spectrum of curvature perturbations from a transient dissipative phase during inflation, leading to a large population…
Spin-2 Portal Dark Matter
Nicolas Bernal, Maira Dutra, Yann Mambrini +3
We generalize models invoking a spin-2 particle as a mediator between the dark sector and the Standard Model. We show that a massive spin-2 messenger can efficiently play the role…
Isocurvature Constraints on Scalar Dark Matter Production from the Inflaton
Marcos A. G. Garcia, Mathias Pierre, Sarunas Verner
We investigate the production of a spectator scalar dark matter field that is directly coupled to the inflaton during inflation and reheating. We consider two specific inflationary…
Effects of Fragmentation on Post-Inflationary Reheating
Marcos A. G. Garcia, Mathieu Gross, Yann Mambrini +3
We consider the effects of fragmentation on the post-inflationary epoch of reheating. In simple single field models of inflation, an inflaton condensate undergoes an oscillatory ph…
A testable hidden-sector model for Dark Matter and neutrino masses
Julia Gehrlein, Mathias Pierre
We consider a minimal extension of the Standard Model with a hidden sector charged under a dark local gauge group, accounting simultaneously for light neutrino masses and t…
Metastable Conformal Dark Matter
Philippe Brax, Kunio Kaneta, Yann Mambrini +1
We show that a metastable dark matter candidate arises naturally from the conformal transformation between the Einstein metric, where gravitons are normalised states, and the Jorda…
Energy-Momentum portal to dark matter and emergent gravity
Pascal Anastasopoulos, Kunio Kaneta, Yann Mambrini +1
We propose a new scenario where dark matter belongs to a secluded sector coupled to the Standard Model through energy--momentum tensors. Our model is motivated by constructions whe…
How warm are non-thermal relics? Lyman- bounds on out-of-equilibrium dark matter
Guillermo Ballesteros, Marcos A. G. Garcia, Mathias Pierre
We investigate the power spectrum of Non-Cold Dark Matter (NCDM) produced in a state out of thermal equilibrium. We consider dark matter production from the decay of scalar condens…
GUT Models at Current and Future Hadron Colliders and Implications to Dark Matter Searches
Giorgio Arcadi, Manfred Lindner, Yann Mambrini +2
Grand Unified Theories (GUT) offer an elegant and unified description of electromagnetic, weak and strong interactions at high energy scales. A phenomenological and exciting possib…
Reheating after Inflaton Fragmentation
Marcos A. G. Garcia, Mathias Pierre
In the presence of self-interactions, the post-inflationary evolution of the inflaton field is driven into the non-linear regime by the resonant growth of its fluctuations. The onc…