Search Publications
Near future MeV telescopes can discover asteroid-mass primordial black hole dark matter
Muñoz, Julian B.; Ray, Anupam; Laha, Ranjan +1 more
Primordial black holes (PBHs), formed out of large overdensities in the early Universe, are a viable dark matter (DM) candidate over a broad range of masses. Ultralight, asteroid-mass PBHs with masses around 1017 g are particularly interesting as current observations allow them to constitute the entire DM density. PBHs in this mass rang…
Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
Cai, Rong-Gen; Chen, Chao; Fu, Chengjie
We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling term with a periodic function of inflaton triggers the exponential growth of the spectator field perturbations, which indirectly amplifies the curvature perturbations to…
Primordial black holes and scalar-induced secondary gravitational waves from inflationary models with a noncanonical kinetic term
Gao, Qing; Gong, Yungui; Yi, Zhu +1 more
With the enhancement mechanism provided by a noncanonical kinetic term with a peak, the amplitude of primordial curvature perturbations can be enhanced by seven orders of magnitude at small scales while keeping to be consistent with observations at large scales. The peak function and inflationary potential are not restricted in this mechanism. We …
INTEGRAL x-ray constraints on sub-GeV dark matter
Pinetti, Elena; Fornengo, Nicolao; Cirelli, Marco +1 more
Light dark matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma rays is challenged by the scarcity of experiments in the MeV-GeV region. We look ther…
Lyman-α constraints on cosmic heating from dark matter annihilation and decay
Slatyer, Tracy R.; Liu, Hongwan; Qin, Wenzer +1 more
We derive new constraints on models of decaying and annihilating dark matter (DM) by requiring that the energy injected into the intergalactic medium (IGM) not overheat it at late times, when measurements of the Lyman-α forest constrain the IGM temperature. We improve upon previous analyses by using the recently developed DarkHistory code package,…
Primordial black holes and secondary gravitational waves from the Higgs field
Gong, Yungui; Wang, Bin; Yi, Zhu +1 more
We devise a novel mechanism and for the first time demonstrate that the Higgs model in particle physics can drive the inflation to satisfy the cosmic microwave background observations and simultaneously enhance the curvature perturbations at small scales to explain the abundance of dark matter in our universe in the form of primordial black holes.…
Constraining primordial black holes as dark matter at JUNO
Wang, Sai; Xia, Dong-Mei; Chang, Zhe +2 more
As an attractive candidate for dark matter, the primordial black holes (PBHs) in the mass range (8 ×1014∼1016) g could be detected via their Hawking radiation, including neutrinos and antineutrinos of three flavors. In this paper, we investigate the possibility to constrain the PBHs as dark matter by measuring (anti)neutrino …
Primordial black holes and secondary gravitational waves from string inspired general no-scale supergravity
Gong, Yungui; Wu, Lina; Li, Tianjun
The formation of primordial black hole (PBH) dark matter and the generation of scalar induced secondary gravitational waves (SIGWs) have been studied in the generic no-scale supergravity inflationary models. By adding an exponential term to the Kähler potential, the inflaton experiences a period of ultraslow-roll and the amplitude of primordial po…
511 keV excess and primordial black holes
Hooper, Dan; Keith, Celeste
An excess of 511 keV photons has been detected from the central region of the Milky Way. It has been suggested that the positrons responsible for this signal might be produced through the Hawking evaporation of primordial black holes. After evaluating the constraints from INTEGRAL, COMPTEL, and Voyager 1, we find that black holes in mass range of …
Isotropic x-ray bound on primordial black hole dark matter
Serpico, P. D.; Siegert, T.; Iguaz, J.
We revisit the constraints on evaporating primordial black holes (PBHs) from the isotropic x-ray and soft gamma-ray background in the mass range 1016- 1018 g . We find that they are stronger than usually inferred due to two neglected effects: (i) The contribution of the annihilation radiation due to positrons emitted in the e…