Technically natural cosmological constant from supersymmetric 6D brane backreaction

Burgess, C.P.; Nierop, Leo van

doi:10.1016/j.dark.2012.10.001

Cited by 38 publications

(85 citation statements)

References 160 publications

(221 reference statements)

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“…This is known not to be a good approximation in general for codimension-2 objects since in many cases it is the classical bulk back-reaction that cancels the brane tensions to allow the classical brane geometries to be flat [24,30,61]. (Indeed, it is this property -together with bulk supersymmetry -that underlies their use as a starting point for seeking solutions to the cosmological constant problem [25,27,62].) The regularized energy density for H and Φ is…”

Section: B Probe-brane Energeticsmentioning

confidence: 99%

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events

Diener

Burgess

2013

J. High Energ. Phys.

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To solve the hierarchy problem, extra-dimensional models must explain why the new dimensions stabilize to the right size, and the known mechanisms for doing so require bulk scalars that couple to the branes. Because of these couplings the energetics of dimensional stabilization competes with the energetics of the Higgs vacuum, with potentially observable effects. These effects are particularly strong for one or two extra dimensions because the bulkHiggs couplings can then be super-renormalizable or dimensionless. Experimental reach for such extra-dimensional Higgs 'portals' are stronger than for gravitational couplings because they are less suppressed at low-energies. We compute how Higgs-bulk coupling through such a portal with two extra dimensions back-reacts onto properties of the Higgs boson. When the KK mass is smaller than the Higgs mass, mixing with KK modes results in an invisible Higgs decay width, missing-energy signals at high-energy colliders, and new mechanisms of energy loss in stars and supernovae. Astrophysical bounds turn out to be complementary to collider measurements, with observable LHC signals allowed by existing constraints. We comment on the changes to the Higgs mass-coupling relationship caused by Higgs-bulk mixing, and how the resulting modifications to the running of Higgs couplings alter vacuum-stability and triviality bounds.

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Section: B Probe-brane Energeticsmentioning

confidence: 99%

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events

Diener

Burgess

2013

J. High Energ. Phys.

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“…The SM is the most general renormalizable theory that is possible given its particular particle content. Ideas for what lies beyond the SM are largely driven by technical naturalness arguments [73], and are motivated by the belief that the SM is an effective field theory [74].…”

Section: Cosmology and The Cosmological Constant Problemmentioning

confidence: 99%

BeyondΛCDM: Problems, solutions, and the road ahead

Bull

Akrami

Adamek

et al. 2016

Physics of the Dark Universe

442

210

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Despite its continued observational successes, there is a persistent (and growing) interest in extending cosmology beyond the standard model, ΛCDM. This is motivated by a range of apparently serious theoretical issues, involving such questions as the cosmological constant problem, the particle nature of dark matter, the validity of general relativity on large scales, the existence of anomalies in the CMB and on small scales, and the predictivity and testability of the inflationary paradigm. In this paper, we summarize the current status of ΛCDM as a physical theory, and review investigations into possible alternatives along a number of different lines, with a particular focus on highlighting the most promising directions. While the fundamental problems are proving reluctant to yield, the study of alternative cosmologies has led to considerable progress, with much more to come if hopes about forthcoming high-precision observations and new theoretical ideas are fulfilled.Keywords: cosmology -dark energy -cosmological constant problem -modified gravitydark matter -early universe Cosmology has been both blessed and cursed by the establishment of a standard model: ΛCDM. On the one hand, the model has turned out to be extremely predictive, explanatory, and observationally robust, providing us with a substantial understanding of the formation of large-scale structure, the state of the early Universe, and the cosmic abundance of different types of matter and energy. It has also survived an impressive battery of precision observational tests -anomalies are few and far between, and their significance is contentious where they do arise -and its predictions are continually being vindicated through the discovery of new effects (B-mode polarization [1] and lensing [2,3] of the cosmic microwave background (CMB), and the kinetic Sunyaev-Zel'dovich effect [4] being some recent examples). These are the hallmarks of a good and valuable physical theory.On the other hand, the model suffers from profound theoretical difficulties. The two largest contributions to the energy content at late times -cold dark matter (CDM) and the cosmological constant (Λ) -have entirely mysterious physical origins. CDM has so far evaded direct detection by laboratory experiments, and so the particle field responsible for it -presumably a manifestation of "beyond the standard model" particle physics -is unknown. Curious discrepancies also appear to exist between the predicted clustering properties of CDM on small scales and observations. The cosmological constant is even more puzzling, giving rise to quite simply the biggest problem in all of fundamental physics: the question of why Λ appears to take such an unnatural value [5,6,7]. Inflation, the theory of the very early Universe, has also been criticized for being fine-tuned and under-predictive [8], and appears to leave many problems either unsolved or fundamentally unresolvable. These problems are indicative of a crisis.From January 14th-17th 2015, we held a conference in Oslo, Norway to surve...

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“…As a result, the most important quantum corrections are those bulk loops that can induce a brane-φ coupling [3,4,9]. Ref.…”

Section: Jhep07(2014)034mentioning

confidence: 99%

“…The models have two (supersymmetric) micron-sized extra dimensions (see below for the origins of this size) setting the scale of the observed Dark Energy density, with ordinary Standard Model particles (but no MSSM superpartners for them) assumed to be localized on a brane 3 [6][7][8][9].…”

Section: Jhep07(2014)034mentioning

confidence: 99%

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Distributed SUSY breaking: dark energy, Newton’s law and the LHC

Burgess

Nierop

Williams

2014

J. High Energ. Phys.

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Abstract:We identify the underlying symmetry mechanism that suppresses the lowenergy effective 4D cosmological constant within some 6D supergravity models, generically leading to results suppressed by powers of the KK scale, m 2 KK , relative to the much larger size, m 4 , associated with mass-m particles localized in these models on codimension-2 branes. These models are examples for which the local conditions for unbroken supersymmetry can be satisfied locally everywhere within the extra dimensions, but are obstructed only by global conditions like flux quantization or by the mutual inconsistency of the boundary conditions required at the various branes. Consequently quantities (like vacuum energies) forbidden by supersymmetry cannot become nonzero until wavelengths of order the KK scale are integrated out, since only such long wavelength modes can see the entire space and so 'know' that supersymmetry has broken. We verify these arguments by extending earlier rugby-ball calculations of one-loop vacuum energies within these models to more general pairs of branes within two warped extra dimensions. JHEP07 (2014)034 numerical purposes we take m to be the top-quark mass and take M g as small as possible, consistent with energy-loss bounds from supernovae.) C is a constant depending on the details of the bulk spectrum, which could easily be of order 500 for each of hundreds of fields in the bulk. The value C ∼ 6 × 10 6 would give the observed Dark Energy density.

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Technically natural cosmological constant from supersymmetric 6D brane backreaction

Cited by 38 publications

References 160 publications

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events

Bulk stabilization, the extra-dimensional Higgs portal and missing energy in Higgs events

BeyondΛCDM: Problems, solutions, and the road ahead

Distributed SUSY breaking: dark energy, Newton’s law and the LHC

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