Salvage of too slow gravitinos

Antoniadis, Ignatios; Benakli, Karim; Ke, Wenqi

doi:10.1007/jhep11(2021)063

Cited by 14 publications

(10 citation statements)

References 24 publications

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“…This is the first time that EWKB has been employed to study spin-3/2 fermions in FRW spacetime. Previous work on GPP with spin-3/2 particles [76][77][78][79] (such as supersymmetry's gravitino [80][81][82]) used numerical techniques to estimate the spectrum of inflationary GPP, finding that for a range of cosmological models and particle masses, there can be a 'catastrophic' production of high-momentum particles [78,79,[83][84][85]. Thus, as an application of our work we complement previous numerical studies with an analytical understanding of spin-3/2 GPP via the Stokes phenomenon.…”

Section: Introductionmentioning

confidence: 52%

An analytic evaluation of gravitational particle production of fermions via Stokes phenomenon

Hashiba,

Ling,

Long

2022

Preprint

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The phenomenon of gravitational particle production can take place for quantum fields in curved spacetime. The abundance and energy spectrum of gravitationally produced particles is typically calculated by solving the field's mode equations on a timedependent background metric. For purposes of studying dark matter production in an inflationary cosmology, these mode equations are often solved numerically, which is computationally intensive, especially for the rapidly-oscillating high-momentum modes. However, these same modes are amenable to analytic evaluation via the Exact Wentzel-Kramers-Brillouin (EWKB) method, where gravitational particle production is a manifestation of the Stokes phenomenon. These analytic techniques have been used in the past to study gravitational particle production for spin-0 bosons. We extend the earlier work to study gravitational production of spin-1/2 and spin-3/2 fermions. We derive an analytic expression for the connection matrix (valid to all orders in perturbations) that relates Bogoliubov coefficients across a Stokes line connecting a merged pair of simple turning points. By comparing the analytic approximation with a direct numerical integration of the mode equations, we demonstrate an excellent agreement and highlight the utility of the Stokes phenomenon formalism applied to fermions. We discuss the implications for an analytic understanding of catastrophic particle production due to vanishing sound speed, which can occur for a spin-3/2 Rarita-Schwinger field.

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Section: Introductionmentioning

confidence: 52%

An analytic evaluation of gravitational particle production of fermions via Stokes phenomenon

Hashiba,

Ling,

Long

2022

Preprint

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“…Typically, although though there are important exceptions, production is most efficient when the DM mass is comparable to the inflationary Hubble scale, m χ ∼ H inf , and since cosmological observations constrain H inf 10 14 GeV, such models usually involve superheavy elementary particles. Notable recent work has explored models of higher-spin DM [54][55][56][57][58][59], models of superheavy DM with m χ > H inf [60][61][62], improved analytical techniques [63][64][65], and cosmological signatures such as isocurvature [66][67][68].…”

Section: Cosmic History and Modelsmentioning

confidence: 99%

Snowmass2021 Cosmic Frontier White Paper: Ultraheavy particle dark matter

Carney¹,

Raj²,

Yang³

et al. 2022

Preprint

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We outline the unique opportunities and challenges in the search for "ultraheavy" dark matter candidates with masses between roughly 10 TeV and the Planck scale m pl ≈ 10 16 TeV. This mass range presents a wide and relatively unexplored dark matter parameter space, with a rich space of possible models and cosmic histories. We emphasize that both current detectors and new, targeted search techniques, via both direct and indirect detection, are poised to contribute to searches for ultraheavy particle dark matter in the coming decade. We highlight the need for new developments in this space, including new analyses of current and imminent direct and indirect experiments targeting ultraheavy dark matter and development of new, ultra-sensitive detector technologies like next-generation liquid noble detectors, neutrino experiments, and specialized quantum sensing techniques.

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“…Notable recent work has explored models of higher-spin DM [110][111][112][113][114][115], models of superheavy DM with m χ > H inf [116][117][118][119], improved analytical techniques [120][121][122], and cosmological signatures such as isocurvature [123][124][125][126]. A complementary experimental effort is underway; the Windchime proposal [127][128][129] seeks to test the gravitational interactions of superheavy DM in the laboratory.…”

Section: Freeze-in Dmmentioning

confidence: 99%

Early-Universe Model Building

Asadi,

Bansal,

Berlin

et al. 2022

Preprint

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Salvage of too slow gravitinos

Cited by 14 publications

References 24 publications

An analytic evaluation of gravitational particle production of fermions via Stokes phenomenon

An analytic evaluation of gravitational particle production of fermions via Stokes phenomenon

Snowmass2021 Cosmic Frontier White Paper: Ultraheavy particle dark matter

Early-Universe Model Building

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