Search Publications
Primordial black hole production during first-order phase transitions
Cai, Rong-Gen; Guo, Zong-Kuan; Liu, Jing +2 more
A novel mechanism for the primordial black hole (PBH) production is proposed as a natural and inevitable consequence of general first-order phase transitions without reference to specific underlying particle physics models. We obtain mutual predictions and constraints between primordial black holes and gravitational waves from phase transitions in…
Hunt for light primordial black hole dark matter with ultrahigh-frequency gravitational waves
Franciolini, Gabriele; Maharana, Anshuman; Muia, Francesco
Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe. This paper critically assesses whether planned and future gravitational wave detectors in the ultrahigh-frequency band could constrain the fraction of dark matter composed of subsolar primordial black holes. Adopting the state-of-the-art description o…
Sensitivities on nonspinning and spinning primordial black hole dark matter with global 21-cm troughs
Laha, Ranjan; Saha, Akash Kumar
Detection of the global 21 cm signal arising from neutral hydrogen can revolutionize our understanding of the standard evolution of the Universe after recombination. In addition, it can also be an excellent probe of dark matter (DM). Among all the DM candidates, primordial black holes (PBHs) are one of the most well motivated. Hawking emission fro…
Dark dimension, the swampland, and the dark matter fraction composed of primordial black holes
Anchordoqui, Luis A.; Antoniadis, Ignatios; Lüst, Dieter
Very recently, it was suggested that combining the swampland program with the smallness of the dark energy and confronting these ideas to experiment lead to the prediction of the existence of a single extra dimension (dubbed the dark dimension) with characteristic length scale in the micron range. We show that the rate of Hawking radiation slows d…
Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations
Calore, F.; Serpico, P. D.; Siegert, T. +2 more
We present a new analysis of the diffuse soft γ -ray emission toward the inner Galaxy as measured by the spectrometer aboard the INTEGRAL satellite (SPI) with 16 years of data taking. The analysis implements a spatial template fit of SPI data and an improved instrumental background model. We characterize the contribution of primordial black holes …
511 keV line constraints on feebly interacting particles from supernovae
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +4 more
Feebly interacting particles with masses with O (10 - 100 ) MeV can be copiously produced by core-collapse supernovae (SNe). In this paper we consider the case of MeV-ish sterile neutrinos and dark photons mixed with ordinary neutrinos and photons, respectively. Furthermore, both sterile neutrinos and dark photons may decay into positrons on their…
Future constraints on primordial black holes from XGIS-THESEUS
Ghosh, Diptimoy; Sachdeva, Divya; Singh, Praniti
Current observations allow primordial black holes (PBHs) in asteroid mass range 1017- 1022 g to constitute the entire dark matter energy density (barring a small mass range constrained by 21-cm observations). In this work, we explore the possibility of probing PBHs with masses 1017- 1019 g via the upcomi…
Primordial black hole dark matter in the context of extra dimensions
Vincent, Aaron C.; Song, Ningqiang; Friedlander, Avi +2 more
Theories of large extra dimensions (LEDs) such as the Arkani-Hamed, Dimopoulos and Dvali scenario predict a "true" Planck scale M⋆ near the TeV scale, while the observed Mp l is due to the geometric effect of compact extra dimensions. These theories allow for the creation of primordial black holes (PBHs) in the early Universe…
Shining ALP dark radiation
Jaeckel, Joerg; Yin, Wen
String scenarios typically not only predict axionlike particles (ALPs) but also significant amounts of ALP dark radiation originating from the decay of the inflaton or a more general modulus. In this paper, we study the decay of such nonthermally produced relativistic (but massive) ALPs to photons. If the ALPs are sufficiently highly energetic, co…
Sensitivity of future gamma-ray telescopes to primordial black holes
Linden, Tim; Hooper, Dan; Keith, Celeste +1 more
The strongest existing constraints on primordial black holes with masses in the range of mBH∼1015- 1017 g have been derived from measurements of the local cosmic-ray electron-positron flux by Voyager 1, and MeV-scale gamma-ray observations of the inner Galaxy by COMPTEL and INTEGRAL. In this paper, we evaluate the …