Composite dark matter from strongly-interacting chiral dynamics

Abstract

A class of chiral gauge theories is studied with accidentally-stable pseudo Nambu-Goldstone bosons playing the role of dark matter (DM). The gauge group contains a vector-like dark color factor that confines at energies larger than the electroweak scale, and a U(1)D factor that remains weakly coupled and is spontaneously broken. All new scales are generated dynamically, including the DM mass, and the IR dynamics is fully calculable. We analyze minimal models of this kind with dark fermions transforming as non-trivial vector-like representations of the Standard Model (SM) gauge group. In realistic models, the DM candidate is a SM singlet and comes along with charged partners that can be discovered at high-energy colliders. The phenomenology of the lowest-lying new states is thus characterized by correlated predictions for astrophysical observations and laboratory experiments.

Dark Matter as dark dwarfs and other macroscopic objects: multiverse relics?

“…Dark Matter (DM) might be an accidentally stable dark baryon made of dark quarks q colored under a new dark gauge group [1][2][3][4][5][6][7][8][9][10][11][12][13]. In models with an appropriate number of light dark quark flavours the dark confinement phase transition is first-order and has interesting cosmological implications [14,15]: relic dark quarks tend to remain in the false vacuum (because they are lighter than dark baryons in the true vacuum), so expanding bubbles of the true vacuum compress them down to small pockets.…”

Supercool Composite Dark Matter Beyond 100 TeV

“…2. We have studied the signals of the model at gravitational waves interferometers, colliders, direct and indirect detection experiments, for the cases where DM is a heavy scalar, 17 Other ways to evade this bound are, for example, DM dilution after a matter era [128,[218][219][220][221][222][223][224][225][226][227], or having a dark sector being much cooler than SM [237,238], DM becoming heavy only after freezing-out [239], DM annihilating with one spectator field [240] or with many of them [241], DM forming an extended object which undergoes a second annihilation stage [228][229][230]. Mechanisms involving phase transitions include the possibility of a short inflationary stage associated with perturbative DM mass generation [147], DM filtered [231,232] or squeezed-out [233,234] by non-relativistic bubble wall motion, DM produced by elastic bubble-bubble collisions [235] or perturbative plasma interactions with relativistic walls [236].…”

Probing Higgs exotic decay at the LHC with machine learning

“…Moreover, such a semi-inclusive approach particularly balances the broadness of the signal space and the usage of kinematics to suppress the background, which will complement the traditional exclusive searches and possible more modelagnostic searches. This strategy can be followed in many different channels, such as W/Z/h-decay to multiple sterile neutrinos [52], continium dark sector [53][54][55], and generally hidden strong dynamics. It is also useful to extend the study of off-shell heavy standard model particle decays, as well as the search of BSM particle decays such as W , Z , top partners and heavy Higgs.…”