Search Publications
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 the baryon abundance with the kinematic Sunyaev-Zel'dovich effect: Projected-field detection using P l a n c k , W M A P , and u n W I S E
Ferraro, Simone; Hill, J. Colin; Kusiak, Aleksandra +2 more
The kinematic Sunyaev-Zel'dovich (kSZ) effect—the Doppler boosting of Cosmic Microwave Background (CMB) photons scattering off free electrons with nonzero line-of-sight velocity—is an excellent probe of the distribution of baryons in the Universe. In this paper, we measure the kSZ effect due to ionized gas traced by infrared-selected galaxies from…
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…
Dark matter properties through cosmic history
Kopp, Michael; Skordis, Constantinos; Thomas, Daniel B. +1 more
We perform the first test of dark matter (DM) stress-energy evolution through cosmic history, using cosmic microwave background measurements supplemented with baryon acoustic oscillation data and the Hubble Space Telescope key project data. We constrain the DM equation of state (EoS) in 8 redshift bins, and its sound speed and (shear) viscosity in…
Late-time acceleration due to a generic modification of gravity and the Hubble tension
Gangopadhyay, Mayukh R.; Sami, M.; Sharma, Mohit K. +1 more
We consider a scenario of modified gravity, which is generic to late-time acceleration, namely, acceleration in the Jordan frame and no acceleration in the Einstein frame. The possibility is realized by assuming an interaction between dark matter and the baryonic component in the Einstein frame which is removed by going to the Jordan frame using a…
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…
Nonparametric reconstruction of interaction in the cosmic dark sector
Mukherjee, Purba; Banerjee, Narayan
The possibility of a nongravitational interaction between dark matter and dark energy is reconstructed using some recent data sets. The crucial aspect is that the interaction is not parametrized at the outset, but rather reconstructed directly from the data in a nonparametric way. The cosmic chronometer Hubble data, the Pantheon supernova compilat…
Supernova bounds on axionlike particles coupled with nucleons and electrons
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +3 more
We investigate the potential of type II supernovae (SNe) to constrain axionlike particles (ALPs) coupled simultaneously to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN unhindered, producing a large ALP flux. For masse…