Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Cosme, Catarina"'
Dark matter freeze-in at stronger coupling is operative when the Standard Model (SM) bath temperature never exceeds the dark matter mass. An attractive feature of this scenario is that it can be probed by direct detection experiments as well as at th
Externí odkaz:
http://arxiv.org/abs/2402.04743
Predictivity of many non-thermal dark matter (DM) models is marred by the gravitational production background. This problem is ameliorated in models with lower reheating temperature $T_R$, which allows for dilution of gravitationally produced relics.
Externí odkaz:
http://arxiv.org/abs/2306.13061
We investigate the production of gravitational waves (GWs) during preheating with monomial/polynomial inflationary potentials, considering a trilinear coupling $\phi\chi^2$ between a daughter field $\chi$ and the inflaton $\phi$. For sufficiently lar
Externí odkaz:
http://arxiv.org/abs/2206.14721
Publikováno v:
Phys. Rev. D 109, 075003 (2024)
We explore a mechanism for producing the baryon asymmetry and dark matter in models with multiple hidden sectors that are Standard-Model-like but with varying Higgs mass parameters. If the field responsible for reheating the Standard Model and the ex
Externí odkaz:
http://arxiv.org/abs/2206.11314
Publikováno v:
Cosme, C., Dutra, M., Godfrey, S. et al. Testing freeze-in with axial and vector Z' bosons. J. High Energ. Phys. 2021, 56 (2021). https://doi.org/10.1007/JHEP09(2021)056
The freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter in the early universe is an appealing alternative to the well-known - and constrained - Weakly Interacting Massive Particle (WIMP) paradigm. Although challenging, the
Externí odkaz:
http://arxiv.org/abs/2104.13937
Autor:
Cosme, Catarina, Tenkanen, Tommi
Publikováno v:
Phys. Rev. D 102, 123534 (2020)
It has been shown that the observed dark matter (DM) abundance can be produced by amplification of quantum fluctuations of an energetically subdominant scalar field during inflation. In this paper, we study the robustness of this "spectator dark matt
Externí odkaz:
http://arxiv.org/abs/2009.01149
Publikováno v:
J. High Energ. Phys. 2021, 26 (2021)
We study the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal. We consider a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a FIMP candid
Externí odkaz:
http://arxiv.org/abs/2003.01723
Autor:
Cosme, Catarina
We introduce an oscillating scalar field coupled to the Higgs that can account for all dark matter in the Universe. Due to an underlying scale invariance of this model, the dark scalar only acquires mass after the electroweak phase transition. We dis
Externí odkaz:
http://arxiv.org/abs/1911.10622
Publikováno v:
Phys. Rev. D 102, 063507 (2020)
We consider the possibility of an oscillating scalar field accounting for dark matter and dynamically controlling the spontaneous breaking of the electroweak symmetry through a Higgs-portal coupling. This requires a late decay of the inflaton field,
Externí odkaz:
http://arxiv.org/abs/1811.08908
We study production of dark matter (DM) in models with a non-standard expansion history. We consider both freeze-out and freeze-in mechanisms for producing the observed DM abundance in a model where the DM consists of scalar singlet particles coupled
Externí odkaz:
http://arxiv.org/abs/1806.11122