Search Publications

High-redshift JWST massive galaxies and the initial clustering of supermassive primordial black holes

Piao, Yun-Song; Huang, Hai-Long; Jiang, Jun-Qian

In this paper, we show that the initial clustering of supermassive primordial black holes (SMPBHs) beyond a Poisson distribution can efficiently enhance the matter power spectrum, and thus the halo mass function. As a result, the population of initially clustered SMPBHs with M

Resonant conversion of gravitational waves in neutron star magnetospheres

McDonald, Jamie I.; Ellis, Sebastian A. R.

High-frequency gravitational waves are the subject of rapidly growing interest in the theoretical and experimental community. In this work we calculate the resonant conversion of gravitational waves into photons in the magnetospheres of neutron stars via the inverse Gertsenshtein mechanism. The resonance occurs in regions where the vacuum birefrin…

Early structure formation from cosmic string loops in light of early JWST observations

Refregier, Alexandre; Jiao, Hao; Brandenberger, Robert

Cosmic strings, if they exist, source nonlinear and non-Gaussian perturbations all the way back to the time of equal matter and radiation (and earlier). Here, we compute the mass function of halos seeded by a scaling distribution of cosmic string loops, and we compare the results with the predictions of the standard Gaussian Λ cold dark matter mod…