O'Connor, J. D.

Wells, John Edwin

doi:10.1002/9781405198431.wbeal0877

Cited by 24 publications

(30 citation statements)

References 1 publication

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“…The scalar masses, on the other hand, follow from the treelevel Kähler potential and are as large as (or larger than) the gravitino mass. For m 3/2 ∼ O (100 · · · 1000) TeV, our model is thus compatible with the scenario of high-scale supersymmetry breaking [46,51,52], which has gained considerable interest after the discovery of the standard model Higgs boson with a mass of 126 GeV [53,54].…”

Section: Discussionmentioning

confidence: 76%

Unified model of chaotic inflation and dynamical supersymmetry breaking

Harigaya

Schmitz

2017

Physics Letters B

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The large hierarchy between the Planck scale and the weak scale can be explained by the dynamical breaking of supersymmetry in strongly coupled gauge theories. Similarly, the hierarchy between the Planck scale and the energy scale of inflation may also originate from strong dynamics, which dynamically generate the inflaton potential. We present a model of the hidden sector which unifies these two ideas, i.e., in which the scales of inflation and supersymmetry breaking are provided by the dynamics of the same gauge group. The resultant inflation model is chaotic inflation with a fractional power-law potential in accord with the upper bound on the tensor-to-scalar ratio. The supersymmetry breaking scale can be much smaller than the inflation scale, so that the solution to the large hierarchy problem of the weak scale remains intact. As an intrinsic feature of our model, we find that the sgoldstino, which might disturb the inflationary dynamics, is automatically stabilized during inflation by dynamically generated corrections in the strongly coupled sector. This renders our model a field-theoretical realization of what is sometimes referred to as sgoldstino-less inflation.

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Section: Discussionmentioning

confidence: 76%

Unified model of chaotic inflation and dynamical supersymmetry breaking

Harigaya

Schmitz

2017

Physics Letters B

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“…For instance, in the pure-gravity mediation [80][81][82] or minimal split SUSY [83] (see also Refs. [84][85][86]), the stop masses of order m 3/2 = O(10 − 100) TeV is favored to explain the Higgs boson mass. In the Higgs or Higgs-anomaly mediation [87][88][89][90], the stop mass squared is generated at the loop level and can be of order 0.01m 2 3/2 .…”

Section: Discussionmentioning

confidence: 99%

ALP inflation and Big Bang on Earth

Takahashi

Yin

2019

J. High Energ. Phys.

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We study a hilltop inflation model where an axion-like particle (ALP) plays the role of the inflaton. We find that, for a broad class of potentials, the decay constant and the mass at the potential minimum satisfy the relation, m φ ∼ 10 −6 f , to explain the CMB normalization. The ALP is necessarily coupled to the standard model particles for successful reheating. The ALP with the above relation can be searched at beam dump experiments, e.g., the SHiP experiment, if the inflation scale is sufficiently low. In this case, the ALP decays through the interactions that led to the reheating of the Universe. In other words, the Big Bang may be probed at ground-based experiments. *

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“…Such a large mass is problematic if this is also the scale of visible-sector superparticle masses, and one wishes to use supersymmetry to solve the hierarchy problem. (However, large superparticle masses are still acceptable for "split" Supersymmetry [28,29].) Any realistic model assuming that DM is produced during an early epoch of matter domination by a heavy scalar [30,31] has to respect this bound.…”

Section: Introductionmentioning

confidence: 99%

Dark matter production in an early matter dominated era

Drees¹,

Hajkarim²

2018

J. Cosmol. Astropart. Phys.

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We investigate dark matter (DM) production in an early matter dominated era where a heavy long-lived particle decays to radiation and DM. In addition to DM annihilation into and thermal DM production from radiation, we include direct DM production from the decay of the long-lived particle. In contrast to earlier treatments the temperature dependence of the number of degrees of freedom g * in the Standard Model (SM) plasma is treated carefully. Besides the well-known cases of thermal hot and cold DM, additional regions of parameter space with the approximately correct DM relic density appear. In some of these regions the temperature dependence of g * can change the final DM density by several hundred percent. Furthermore, we analyze the effect of allowing nonvanishing initial abundances for radiation and DM. We find an upper bound on the mass of the long-lived particle if the DM annihilation cross section is below that corresponding to thermal WIMP (Weakly Interactive Massive Particle) DM in standard cosmology.

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O'Connor, J. D.

Abstract: Professor Joseph Desmond O'Connor (1919–98) was one of the leading British phoneticians in the second half of the 20th century. A friendly and informal man, he was known by everyone, students as well as colleagues, as Doc.

Cited by 24 publications

References 1 publication

Unified model of chaotic inflation and dynamical supersymmetry breaking

Unified model of chaotic inflation and dynamical supersymmetry breaking

ALP inflation and Big Bang on Earth

Dark matter production in an early matter dominated era

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