Strong gravitational radiation from a simple dark matter model

Abstract

A rather minimal possibility is that dark matter consists of the gauge bosons of a spontaneously broken symmetry. Here we explore the possibility of detecting the gravitational waves produced by the phase transition associated with such breaking. Concretely, we focus on the scenario based on an SU (2) D group and argue that it is a case study for the sensitivity of future gravitational wave observatories to phase transitions associated with dark matter. This is because there are few parameters and those fixing the relic density also determine the effective potential establishing the strength of the phase transition. Particularly promising for LISA and even the Einstein Telescope is the super-cool dark matter regime, with DM masses above O(100) TeV, for which we find that the gravitational wave signal is notably strong. In our analysis, we include the effect of astrophysical foregrounds, which are often ignored in the context of phase transitions.

Detecting gravitational waves from cosmological phase transitions with LISA: an update

“…The possibility of detecting GWs from a PT in a dark sector was explored in [180] in models of composite dark sectors, and further explored in a variety of other DM scenarios in [69,[181][182][183][184][185][186][187][188][189][190][191][192]. While of course any hidden sector could be engineered to feature a cosmological PT, scenarios in which the PT serves a specific purpose can yield specific predictions for GW signals at LISA.…”

Strong supercooling as a consequence of renormalization group consistency

“…As already briefly discussed in Section III A, after the generation of a finite v QCD φ , the s field will either roll down the potential or undergo a first-order phase transition. While we do not study which of the two scenarios occurs for our parameter points, note that the latter option is not expected to produce an observable gravitational wave signature [11], implying that both cosmological scenarios are phenomenologically equivalent.…”

“…Scale-invariant theories, on the other hand, are based on a nearly-conformal effective potential and can thus circumvent the aforementioned upper limits [36]. Depending on the concrete scenario, supercooling can even become so strong that the scalesymmetry-breaking PT does not complete until the Universe cools down to temperatures of the order of the QCD scale [9][10][11]. In such cases, the chiral PT of QCD is anticipated to proceed anyway, which will eventually induce electroweak symmetry breaking [9].…”

Gravitational waves from scale-invariant vector dark matter model: probing below the neutrino-floor

“…Particularly, conformal DM models with Higgs portal are attractive because they can solve DM problem and at the same time can generate a strongly first order phase transition [8][9][10][11]. GWs due to first order phase transition have been studied within models where the scale-invariant symmetry is broken due to Coleman-Weinberg mechanism [12][13][14][15][16][17][18][19][20] or models with DM candidate [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Conformal * a.mohamadnejad@ut.ac.ir symmetry also proposed as a possible solution for hierarchy problem [40].…”