Gravitino or axino dark matter with reheat temperature as high as 1016 GeV

Self Cite

In all supersymmetric theories, gravitinos, with mass suppressed by the Planck scale, are an obvious candidate for dark matter; but if gravitinos ever reached thermal equilibrium, such dark matter is apparently either too abundant or too hot, and is excluded. However, in theories with an axion, a saxion condensate is generated during an early era of cosmological history and its late decay dilutes dark matter. We show that such dilution allows previously thermalized gravitinos to account for the observed dark matter over very wide ranges of gravitino mass, keV < m 3/2 < TeV, axion decay constant, 10 9 GeV < f a < 10 16 GeV, and saxion mass, 10 MeV < m s < 100 TeV. Constraints on this parameter space are studied from BBN, supersymmetry breaking, gravitino and axino production from freeze-in and saxion decay, and from axion production from both misalignment and parametric resonance mechanisms. Large allowed regions of (m 3/2 , f a , m s ) remain, but differ for DFSZ and KSVZ theories. Superpartner production at colliders may lead to events with displaced vertices and kinks, and may contain saxions decaying to (W W, ZZ, hh), gg, γγ or a pair of Standard Model fermions. Freeze-in may lead to a sub-dominant warm component of gravitino dark matter, and saxion decay to axions may lead to dark radiation.

Section: Jhep07(2017)125mentioning

confidence: 99%

Saxion cosmology for thermalized gravitino dark matter

DʼEramo

Hall

et al. 2017

Self Cite

“…This model is very similar to the singlet-doublet DM model considered in [30,41], and could be regarded as a simplified version of the Higgsino-Axino system studied in [10,27,39,40], or an analog of a would-be feebly interacting Higgsino-Bino or Higgsino-Singlino system, bearing in mind that here χ and Ψ are Dirac fermions.…”

Section: The Modelmentioning

confidence: 99%

“…(2.1) is neutral, which are significantly more challenging to probe experimentally than those with a charged parent particle 5 , particularly if the decay length of A is large, cτ A 1 m. In the following we consider B SM in Eq. (2.1) to be the SM Higgs [27,30,40].…”

Section: Freeze-in (From Decay) Via the Standard Model Higgsmentioning

confidence: 99%

“…the main LHC detectors. TeV hadron collider (from now on referred to as FCC-hh) and a forward LLP detector with volume given by z ∈ [20,40] m, ρ = x 2 + y 2 ∈ [5, 30] m as measured from the FCC-hh interaction point.…”

Section: Displaced Vertex (Dv) Signaturesmentioning

confidence: 99%

“…As a concrete model, we study a freeze-in DM scenario via the SM Higgs (a simple version of a supersymmetric Higgsino-Axino [27,39,40] or Higgsino-singlino system, very similar to the so-called singlet-doublet DM scenario from [30,41]). We perform an analysis of the projected sensitivity of MATHUSLA in its 100 m × 100 m (MATHUSLA100) and 200 m × 200 m (MATHUSLA200) design proposals [34], to the freeze-in DM parameter space, and study its complementarity to LLP searches with the ATLAS and CMS detectors which use displaced vertices and missing transverse energy E miss T [30].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Probing dark matter freeze-in with long-lived particle signatures: MATHUSLA, HL-LHC and FCC-hh

Tunney

Zaldívar

2020

Collider searches for long-lived particles yield a promising avenue to probe the freeze-in production of Dark Matter via the decay of a parent particle. We analyze the prospects of probing the parameter space of Dark Matter freeze-in from the decay of neutral parent particles at the LHC and beyond, taking as a case study a freeze-in Dark Matter scenario via the Standard Model Higgs. We obtain the projected sensitivity of the proposed MATHUSLA surface detector (for MATHUSLA100 and MATHUSLA200 configurations) for long-lived particle searches to the freeze-in Dark Matter parameter space, and study its complementarity to searches by ATLAS and CMS at HL-LHC, as well as the interplay with constraints from Cosmology: Big-Bang Nucleosynthesis and Lyman-α forest observations. We then analyze the improvement in sensitivity that would come from a forward detector within a future 100 TeV pp-collider. In addition, we discuss several technical aspects of the present Dark Matter freeze-in scenario: the role of the electroweak phase transition; the inclusion of thermal masses, which have been previously disregarded in freeze-in from decay studies; the impact of 2 → 2 scattering processes on the Dark Matter relic abundance; and the interplay between freeze-in and super-WIMP Dark Matter production mechanisms.1 The inverse processes are absent due to the small DM abundance w.r.t. equilibrium densities and to the feeble coupling between DM and the thermal bath.2 This is commonly known as infrared freeze-in. For other possibilities, see e.g. [20,21].3 See e.g. [22], although see [17,23,24] for recent phenomenological probes of freeze-in through a portal.

Probing the BSM physics with CMB precision cosmology: an application to supersymmetry

Dalianis

Watanabe

2018

The cosmic history before the BBN is highly determined by the physics that operates beyond the Standard Model (BSM) of particle physics and it is poorly constrained observationally. Ongoing and future precision measurements of the CMB observables can provide us with significant information about the pre-BBN era and hence possibly test the cosmological predictions of different BSM scenarios. Supersymmetry is a particularly motivated BSM theory and it is often the case that different superymmetry breaking schemes require different cosmic histories with specific reheating temperatures or low entropy production in order to be cosmologically viable. In this paper we quantify the effects of the possible alternative cosmic histories on the n s and r CMB observables assuming a generic non-thermal stage after cosmic inflation. We analyze TeV and especially multi-TeV supersymmetry breaking schemes assuming the neutralino and gravitino dark matter scenarios. We complement our analysis considering the Starobinsky R 2 inflation model to exemplify the improved CMB predictions that a unified description of the early universe cosmic evolution yields. Our analysis underlines the importance of the CMB precision measurements that can be viewed, to some extend, as complementary to the laboratory experimental searches for supersymmetry or other BSM theories.