Inflation and Gauge Mediation in Supersymmetric Gauge Theory

Kamada, Kohei; Nakai, Yuichiro; Sakai, Manabu

doi:10.1143/ptp.125.395

Cited by 3 publications

(7 citation statements)

References 48 publications

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“…2 There are models where the inflaton resides directly into the hidden sector [34][35][36][37][38][39], though there seem to be difficulties in getting towards low supersymmetry breaking scales.…”

Section: Arxiv:170506788v2 [Hep-th] 9 Aug 2017mentioning

confidence: 99%

“…The inflationary paradigm for the very early universe is indeed supported by more and more experimental evidence, and the high energy scales that it naturally involves beg for its embedding in supergravity, as a first step towards a more complete quantum treatment in string theory models. 1 Models where the sgoldstino itself is the inflaton exist [24][25][26][27], though it has been more popular to consider an inflaton superfield together with a stabilizer superfield [28], which can cure most of the problems of SUGRA inflation, and/or together with a supersymmetry breaking sector [29][30][31].2 There are models where the inflaton resides directly into the hidden sector [34][35][36][37][38][39], though there seem to be difficulties in getting towards low supersymmetry breaking scales.…”

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confidence: 99%

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Sgoldstino-less inflation and low energy SUSY breaking

Argurio

Coone

Heurtier

et al. 2017

J. Cosmol. Astropart. Phys.

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We assess the range of validity of sgoldstino-less inflation in a scenario of low energy supersymmetry breaking. We first analyze the consistency conditions that an effective theory of the inflaton and goldstino superfields should satisfy in order to be faithfully described by a sgoldstino-less model. Enlarging the scope of previous studies, we investigate the case where the effective field theory cut-off, and hence also the sgoldstino mass, are inflaton-dependent. We then introduce a UV complete model where one can realize successfully sgoldstino-less inflation and gauge mediation of supersymmetry breaking, combining the α-attractor mechanism and a weakly coupled model of spontaneous breaking of supersymmetry. In this class of models we find that, given current limits on superpartner masses, the gravitino mass has a lower bound of the order of the MeV, i.e. we cannot reach very low supersymmetry breaking scales. On the plus side, we recognize that in this framework, one can derive the complete superpartner spectrum as well as compute inflation observables, the reheating temperature, and address the gravitino overabundance problem. We then show that further constraints come from collider results and inflation observables. Their non trivial interplay seems a staple feature of phenomenological studies of supersymmetric inflationary models. arXiv:1705.06788v2 [hep-th] 9 Aug 2017Contents Recently there has been renewed interest in models of inflation in supergravity [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The inflationary paradigm for the very early universe is indeed supported by more and more experimental evidence, and the high energy scales that it naturally involves beg for its embedding in supergravity, as a first step towards a more complete quantum treatment in string theory models. 1 Models where the sgoldstino itself is the inflaton exist [24][25][26][27], though it has been more popular to consider an inflaton superfield together with a stabilizer superfield [28], which can cure most of the problems of SUGRA inflation, and/or together with a supersymmetry breaking sector [29][30][31].2 There are models where the inflaton resides directly into the hidden sector [34][35][36][37][38][39], though there seem to be difficulties in getting towards low supersymmetry breaking scales.

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Section: Arxiv:170506788v2 [Hep-th] 9 Aug 2017mentioning

confidence: 99%

mentioning

confidence: 99%

Sgoldstino-less inflation and low energy SUSY breaking

Argurio

Coone

Heurtier

et al. 2017

J. Cosmol. Astropart. Phys.

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“…Recently, two of the present authors realized hybrid inflation [17] embedded in a gaugemediated SUSY-breaking model motivated by the KOO model [18]. This scenario uses two hierarchical mass scales in the magnetic description of the KOO model such that the higher scale corresponds to the inflationary scale and the lower scale corresponds to the SUSY breaking scale.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we present an inflationary scenario following the line of Ref. [18] and analyze the reheating stage of an inflation model with gauge mediation. Since the couplings of the inflaton in the SUSY breaking hidden sector with the visible sector fields are given by the standard model gauge interactions, the reheating process after inflation is predictable in this framework.…”

Section: Introductionmentioning

confidence: 99%

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Inflation in Gauge Mediation and Gravitino Dark Matter

Kamada

Nakai

Sakai

2011

Progress of Theoretical Physics

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We present an inflationary scenario based on a phenomenologically viable model with direct gauge mediation of low-scale supersymmetry breaking. Inflation can occur in the supersymmetry-breaking hidden sector. Although the reheating temperature from the inflaton decay is so high that the gravitino problem seems to be severe, late time entropy production from the decay of the pseudomoduli field associated with the supersymmetry breaking can dilute gravitinos sufficiently. We show that gravitinos are also produced from the pseudomoduli decay and there is a model parameter space where gravitinos can be the dark matter in the present universe. * Cosmological inflation [1,2] in the early universe is now considered as a part of the "standard" cosmology. It can solve many cosmological problems such as the horizon problem and the flatness problem. It also accounts for the origin of the primordial fluctuations [3]. In most models of inflation, a scalar field with the flat potential (called the inflaton) which drives inflation is assumed to be outside the standard model of particle physics since there is almost no inflaton candidate in this framework. 1 Then, a natural question is how inflation dynamics is embedded in a particle physics model beyond the standard model. To construct an inflation model, it is reasonable to respect supersymmetry (SUSY), which is one of the most promising candidates for physics beyond the standard model, because the radiative corrections for scalar fields are suppressed in supersymmetric theories and an inflaton potential can be naturally flattened.If SUSY is realized in nature, it must be broken at some energy scale. We usually leave its dynamics to a SUSY breaking hidden sector and the SUSY breaking effect is transmitted to the visible sector by some interactions. Gauge mediation is an attractive mechanism, which uses the standard model gauge interactions [7,8] (For recent general arguments, see Ref.[9]). It naturally suppresses the unwanted flavor-changing processes due to flavor blindness of the gauge interactions. While many gauge mediation models are already known, the model proposed by Kitano, Ooguri and Ookouchi (KOO) [10] is a distinguished one (see also Ref. [11]). This model is based on the recent development of metastable SUSY breaking in supersymmetric QCD (SQCD) started from the work of Intriligator, Seiberg and Shih (ISS)[12] and is classified as so-called direct gauge mediation models [13] where the flavor symmetries of a hidden SUSY breaking sector are weakly gauged and identified with the standard model gauge symmetries. The KOO model can generate sizable gaugino masses while many direct gauge mediation models suffer from anomalously small gaugino masses [14] (see also Ref. [15]). However, since the vacuum considered in the KOO model (the ISS vacuum) is not the global minimum of the potential, it is necessary to impose several conditions on the model parameters in order to guarantee the vacuum stability. In particular, two hierarchical mass scales are required in the flavors o...

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