Search Publications

Astrophysical constraints on decaying dark gravitons

Obied, Georges; Law-Smith, Jamie A. P.; Prabhu, Anirudh +1 more

In the dark dimension scenario, which predicts an extra dimension of micron scale, dark gravitons (KK modes) are a natural dark matter candidate. In this paper, we study observable features of this model. In particular, their decay to standard matter fields can distort the CMB and impact other astrophysical signals. Using this we place bounds on t…

Spinning primordial black holes from first order phase transition

Banerjee, Indra Kumar; Dey, Ujjal Kumar

We conduct a novel study to obtain the initial spin of the primordial black holes created during a first-order phase transition due to delayed false vacuum decay. Remaining within the parameter space consistent with observational bounds, we express the abundance and the initial spin of the primordial black holes as functions of the phase transitio…

Light thermal dark matter beyond p-wave annihilation in minimal Higgs portal model

Wu, Lei; Chen, Yu-Tong; Matsumoto, Shigeki +2 more

This study explores a minimal renormalizable dark matter (DM) model, incorporating a sub-GeV Majorana DM and a singlet scalar particle ϕ. Using scalar and pseudo-scalar interactions (couplings c_s and c_p), we investigate implications for DM detection, considering s-wave, p-wave, and combined (s+p wave) contributions in DM anni…

Freezing-in cannibal dark sectors

Hryczuk, Andrzej; Cervantes, Esau

Self-Interacting Dark Matter models can successfully explain dark matter (DM) production through interactions confined within the dark sector. However, they often lack measurable experimental signals due to their secluded nature. Including a feeble interaction with the visible sector through a Higgs portal leads not only to potential detection ave…