Getting a THUMP from a WIMP

Abstract

Producing an acceptable thermal relic abundance of dark matter with masses 10 2 TeV is a challenge. We propose a novel mechanism where GeV-scale states establish a tiny thermal relic abundance for dark matter, which is later promoted to ultra massive status by a very light scalar. We refer to this dark matter as a THermal Ultra Massive Particle (THUMP). Direct detection of THUMPs can be naturally expected due to large scattering cross sections mediated by low mass states that couple THUMPs to the Standard Model. Our model generically leads to signals for the associated GeV-scale states at accelerator experiments.

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 superheavy dark matter with gravitational waves

“…Since α DM has an upper limit ∼ 4π set by the unitarity bound, M DM also has an upper limit, which is ∼ 300 TeV derived from the partial wave analysis, known as the Griest-Kamionkowski (GK) bound [10]. 1 It is known that DM can be heavier than the GK bound in case of non-thermal dynamics, nonstandard cosmological history [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] or the first-order cosmic phase transition [29][30][31][32].…”

Superheavy WIMP dark matter from incomplete thermalization

“…There have been attempts to make the thermal superheavy DM scenario viable. Recent attempts include a freeze-out mechanism for a DM particle accompanied by many degenerate states [5], a huge mass gain by a late time phase transition after freeze-out [6], DM annihilations with DM number non-conserving 2 ↔ 2 interactions [7], the DM thermalization with not the SM thermal plasma but a hidden sector's [8], and the DM freeze-out during a matter-dominated era after inflation [9].…”