Search Publications
Constraints on primordial curvature spectrum from primordial black holes and scalar-induced gravitational waves
Yi, Zhu; Fei, Qin
The observational data of primordial black holes and scalar-induced gravitational waves can constrain the primordial curvature perturbation at small scales. We parameterize the primordial curvature perturbation by a broken power law form and find that it is consistent with many inflation models that can produce primordial black holes, such as nonm…
Primordial black holes in nonminimal derivative coupling inflation with quartic potential and reheating consideration
Karami, Kayoomars; Heydari, Soma
We investigate the generation of primordial black holes (PBHs) with the aid of gravitationally increased friction mechanism originated from the nonminimal field derivative coupling (NMDC) to gravity framework, with the quartic potential. Applying the coupling parameter as a two-parted function of inflaton field and fine-tuning of five parameter as…
Limits on primordial black holes detectability with Isatis: a BlackHawk tool
Auffinger, Jérémy
Primordial black holes (PBHs) are convenient candidates to explain the elusive dark matter (DM). However, years of constraints from various astronomical observations have constrained their abundance over a wide range of masses, leaving only a narrow window open at
Inverse Seesaw, dark matter and the Hubble tension
Pierre, M.; Fernandez-Martinez, E.; Pinsard, E. +1 more
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 Majoron associated to the spontaneous symmetry breaking can alleviate the Hubble tension through its contribution to Δ Neff and late decays to neutrinos. Among th…
Clusters of Primordial Black Holes
Belotsky, Konstantin M.; Dokuchaev, Vyacheslav I.; Eroshenko, Yury N. +7 more
The Primordial Black Holes (PBHs) are a well-established probe for new physics in the very early Universe. We discuss here the possibility of PBH agglomeration into clusters that may have several prominent observable features. The clusters can form due to closed domain walls appearance in the natural and hybrid inflation models whose subsequent ev…
X-ray lines and self-interacting dark matter
Mambrini, Yann; Toma, Takashi
We study the correlation between a monochromatic signal from annihilating dark matter and its self-interacting cross section. We apply our argument to a complex scalar dark sector, where the pseudo-scalar plays the role of a warm dark matter candidate while the scalar mediates its interaction with the Standard Model. We combine the recent observat…