Zooming in on fermions and quantum gravity

Eichhorn, Astrid; Lippoldt, Stefan; Schiffer, Marc

doi:10.1103/physrevd.99.086002

Cited by 78 publications

(110 citation statements)

References 89 publications

(222 reference statements)

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“…In fact, even in a setting with interacting fixed points, such truncations could be reliable. Indeed, in the context of diffeomorphism invariant gravity, there are indications that the asymptotically safe fixed point lies in a near-perturbative regime [87][88][89][90], where higher order operators follow their canonical scaling [91][92][93][94]. For a nongravitational example showing the convergence of a truncation based on canonical power counting for an interacting fixed point, see, e.g., [79].…”

Section: Impact Of Quantum Gravity With a Preferred Frame On Mattermentioning

confidence: 99%

“…Finally, despite the breaking of diffeomorphism invariance due to gauge fixing and regulator, we will assume that all different n-point functions originating from the same term in the effective action Γ k come with the same coupling. Indications that this assumption holds semiquantitatively at an asymptotically safe fixed point has been investigated in a Lorentz invariant setting, e.g., in [87][88][89][90].…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Lorentz invariance violations in the interplay of quantum gravity with matter

Eichhorn

Platania²,

Schiffer³

2020

Phys. Rev. D

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We explore the interplay of matter with quantum gravity with a preferred frame to highlight that the matter sector cannot be protected from the symmetry-breaking effects in the gravitational sector. Focusing on Abelian gauge fields, we show that quantum gravitational radiative corrections induce Lorentzinvariance-violating couplings for the Abelian gauge field. In particular, we discuss how such a mechanism could result in the possibility to translate observational constraints on Lorentz violation in the matter sector into strong constraints on the Lorentz-violating gravitational couplings.

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Section: Impact Of Quantum Gravity With a Preferred Frame On Mattermentioning

confidence: 99%

Section: Acknowledgmentsmentioning

confidence: 99%

Lorentz invariance violations in the interplay of quantum gravity with matter

Eichhorn

Platania²,

Schiffer³

2020

Phys. Rev. D

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“…This would imply a weakly coupled asymptotically safe regime with a very small fixed-point value. It is intriguing that hints for a rather weakly-coupled (in the sense of near-Gaussian scaling behavior) asymptotically safe regime have been found in pure gravity [23,35,100], and in particular with matter [5,48,49]. The latter also might allow a near-perturbative UV completion for the Standard Model [2][3][4]72].…”

Section: Conditions Realizing An Intermediate Scaling Regimementioning

confidence: 99%

Asymptotic safety, string theory and the weak gravity conjecture

et al. 2019

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We propose a scenario with string theory in the deep ultraviolet, an intermediate asymptotically safe scaling regime for gravity and matter, and the Standard Model in the infrared. This could provide a new perspective to tackle challenges of the two models: For instance, the gravitational Renormalization Group flow could connect a negative microscopic to a positive macroscopic cosmological constant, potentially rendering string theory on an anti-de Sitter background observationally viable. Further, the unitarity of a string-theoretic ultraviolet completion could be inherited by an asymptotically safe fixed point, despite the presence of higher-order interactions. We discuss necessary conditions on the scale of asymptotic safety and the string scale for our scenario to be viable. As a first test, we explore the weak-gravity conjecture in the context of asymptotically safe gravity.

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“…Starting with the seminal work by Reuter [15], a lot of evidence was collected in favour of this scenario [16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The interplay of quantum gravity and matter was extensively investigated as well [30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Dark matter meets quantum gravity

Reichert

Smirnov

2020

Phys. Rev. D

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We search for an extension of the Standard Model that contains a viable dark matter candidate and that can be embedded into a fundamental, asymptotically safe, quantum field theory with quantum gravity. Demanding asymptotic safety leads to boundary conditions for the non-gravitational couplings at the Planck scale. For a given dark matter model these translate into constraints on the mass of the dark matter candidate. We derive constraints on the dark matter mass and couplings in two minimal dark matter models: i) scalar dark matter coupled via the Higgs-portal in the B-L model; ii) fermionic dark matter in a U (1)X extension of the Standard Model, coupled via the new gauge boson. For scalar dark matter we find 56 GeV < MDM < 63 GeV, and for fermionic dark matter MDM ≤ 37 TeV. Within our framework, we identify three benchmark scenarios with distinct phenomenological consequences.

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Zooming in on fermions and quantum gravity

Cited by 78 publications

References 89 publications

Lorentz invariance violations in the interplay of quantum gravity with matter

Lorentz invariance violations in the interplay of quantum gravity with matter

Asymptotic safety, string theory and the weak gravity conjecture

Dark matter meets quantum gravity

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