Dynamical supergravity breaking via the super-Higgs effect revisited

Alexandre, Jean; Houston, Nick; Mavromatos, Nikolaos

doi:10.1103/physrevd.88.125017

Cited by 33 publications

(168 citation statements)

References 37 publications

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“…They satisfy the constraint: λ S − λ PS + 4λ PV = −3κ 2 /4. This freedom was addressed in the second reference in [20], where we refer the reader for details. 1 Our metric signature is (−, +, +, +) and the definitions of the Ricci and Riemann curvature tensors are R μν = R λ μλν and R λ μνρ = ∂ ν Γ λ μρ −.…”

Section: Dynamical Breaking Ofmentioning

confidence: 99%

“…For phenomenological reasons which have been outlined in detail in refs. [19,20], and we shall discuss below, we adopt an extension of N = 1 SUGRA which incorporates local supersymmetry in the Jordan frame, enabled by an associated dilaton superfield [14]. The scalar component ϕ of the latter can be either a fundamental space-time scalar mode of the gravitational multiplet, i.e.…”

Section: Icnfp 2015mentioning

confidence: 99%

“…[20]. We consider the (on-shell) action for 'minimal' N = 1 D = 4 supergravity in the second order formalism [17,18]:…”

Section: Dynamical Breaking Ofmentioning

confidence: 99%

“…The supersymmetry breaking occurs dynamically via the formation of gravitino condensates, as a consequence of the four-gravitino interactions that characterise (any) supergravity action, via the fermionic torsion parts of the spin connection. The approach is documented in a series of previous publications [19][20][21] and will be reviewed briefly here. We should stress that our approach does not supersymmetrise higher curvature terms in the action to obtain Starobinksy-like effective actions, as e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Since this must be an energetically favourable process to occur, it then follows that the effective potential experienced by the gravitino condensate must be locally concave about the origin. The corresponding one-loop effective potential of the gravitino condensate scalar field, therefore, has the characteristic form of a Coleman-Weinberg double well potential, offering the possibility of hilltop-type inflation, with the condensate field playing the role of the inflaton [19,20], which would be the simplest scenario. However, in order to guarantee a slow-roll inflation one needs unnaturally large values of the gravitino-condensate wave function renormalisation, unless transplanckian scales for supersymmetry breaking are invoked.…”

Section: Introductionmentioning

confidence: 99%

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Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via “running vacuum”

Mavromatos

2016

EPJ Web Conf.

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Abstract. On the occasion of a century from the proposal of General relativity by Einstein, I attempt to tackle some open issues in modern cosmology, via a toy but non-trivial model. Specifically, I would like to link together: (i) the smallness of the cosmological constant today, (ii) the evolution of the universe from an inflationary era after the bigbang till now, and (iii) local supersymmetry in the gravitational sector (supergravity) with a broken spectrum at early eras, by making use of the concept of the "running vacuum" in the context of a simple toy model of four-dimensional N=1 supergravity. The model is characterised by dynamically broken local supersymmetry, induced by the formation of gravitino condensates in the early universe. As I will argue, there is a Starobinsky-type inflationary era characterising the broken supersymmetry phase in this model, which is compatible with the current cosmological data, provided a given constraint is satisfied among some tree-level parameters of the model and the renormalised cosmological constant of the de Sitter background used in the analysis. Applying the "running vacuum" concept, then, to the effective field theory at the exit of inflation, makes a smooth connection (in cosmic time) with the radiation dominance epoch and subsequently with the current era of the Universe, characterised by a small (but dominant) cosmological-constant contribution to the cosmic energy density. In this approach, the smallness of the cosmological constant today is attributed to the failure (due to quantum gravity non-perturbative effects) of the aforementioned constraint.

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Section: Dynamical Breaking Ofmentioning

confidence: 99%

Section: Icnfp 2015mentioning

confidence: 99%

“…[20]. We consider the (on-shell) action for 'minimal' N = 1 D = 4 supergravity in the second order formalism [17,18]:…”

Section: Dynamical Breaking Ofmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via “running vacuum”

Mavromatos

2016

EPJ Web Conf.

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Anti-brane uplift instability from goldstino condensation

Dall’Agata

Emelin

Farakos

et al. 2022

J. High Energ. Phys.

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We investigate the possible appearance of composite states of the goldstino in models with four-dimensional non-linear supersymmetry and we provide a description of their dynamics in terms of a Kähler potential and a superpotential. Our analysis shows that the critical point corresponding to the Volkov-Akulov model is unstable. Similarly, we find that the uplifted stable de Sitter critical point of the KKLT model is shifted and acquires a tachyonic instability. Our findings indicate the existence of a potentially dangerous instability shared by all anti-brane uplifts.

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Starobinsky-like inflation in dilaton-brane cosmology

2014

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We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.

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Dynamical supergravity breaking via the super-Higgs effect revisited

Cited by 33 publications

References 37 publications

Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via “running vacuum”

Supersymmetry, Cosmological Constant and Inflation: Towards a fundamental cosmic picture via “running vacuum”

Anti-brane uplift instability from goldstino condensation

Starobinsky-like inflation in dilaton-brane cosmology

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