Gravitational contributions to the electron $g$-factor

Cohen, Andrew G.; Kaplan, David B.

doi:10.48550/arxiv.2103.04509

Cited by 9 publications

(27 citation statements)

References 13 publications

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“…Basically, considering the (g − 2) experiment allows us to calculate the deviations that occur due to the presence of gravity. For a technical review on both the UV-IR cutoffs correlation and (g − 2) test, and to avoid prolonging the discussion, let us refer the reader to [7,[10][11][12] and references therein. Now we are going to turn our attention to the so called holographic dark energy model obviously as an emergent of CKN model.…”

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confidence: 99%

“…There are some outstanding examples of the applications of holography concept in high energy physics, of which the anti De Sitter/conformal field theory, AdS/CFT, correspondence [17,18] and entropy of black holes [6,19] are well-known to physics community . To avoid the breakdown of black hole formation within the EFT, based on [7,11,12,14,20,21], there should be a bound for the entropy of black hole as…”

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confidence: 99%

“…where even if IR cutoff behaves like Λ −2 , according to [7,12], the holography concept can not be mimicked anymore, at least for a cosmological purpose. The numerical constant 3c 2 is introduced for convenience and it is not dimensionless as appeared usually in the literature.…”

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confidence: 99%

“…( 3) to its analogues appeared in [7] and [12], it isn't allowed to easily consider this equation as a holographic dark energy equation, that should mimic such a formula Λ 4 = ρ Λ ≅ πM 2 P l L −2 . In this regard, as discussed in CKN and CK, [7,12], and obviously from Eq. ( 1), the IR and UV cutoffs can not be treated as independent parameters.…”

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confidence: 99%

“…Now let's turn our attention to the so called electron (g − 2) experiment. Following CKN and CK, [7,12], and by utilizing Eq. ( 1) we can obtain the constraint between IR and UV cutoffs as follows,…”

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confidence: 99%

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Is the Universe actually holographic?

Sheikhahmadi¹

2021

Preprint

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In this letter, we are going to reexamine the holographic dark energy concept that is proposed for cosmological applications. By considering precisely the bounds on the entropy arisen from lattice field theory on one side and Bekenstein-Hawking entropy of black holes on another side, it is shown that the so-called holographic dark energy can not be mimicked as easily as claimed in the literature. In addition, the limits which are discussed in the literature on the electron (g − 2) experiments, are rediscussed here. It is shown that the corrections to the electron magnetic momentum should be of the order of O(10 −23 ).

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confidence: 99%

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Is the Universe actually holographic?

Sheikhahmadi¹

2021

Preprint

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IR/UV mixing, towers of species and swampland conjectures

Castellano

Herráez

Ibáñez

2022

J. High Energ. Phys.

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By applying the Covariant Entropy Bound (CEB) to an EFT in a box of size 1/ΛIR one obtains that the UV and IR cut-offs of the EFT are necessarily correlated. We argue that in a theory of Quantum Gravity (QG) one should identify the UV cutoff with the ‘species scale’, and give a general algorithm to calculate it in the case of multiple towers becoming light. One then obtains an upper bound on the characteristic mass scale of the tower in terms of the IR cut-off, given by Mtower ≲ $$ {\left({\Lambda}_{\mathrm{IR}}\right)}^{2{\alpha}_D} $$ Λ IR 2 α D in Planck units, with αD = (D − 2 + p)/2p(D − 1), where p depends on the density of states. Identifying the IR cut-off with a (non-vanishing) curvature in AdS one reproduces the statement of the AdS Distance Conjecture (ADC), also giving an explicit lower bound for the α exponent. In particular, we find that the CEB implies α ≥ 1/2 in any dimension if there is a single KK tower, both in AdS and dS vacua. However values α < 1/2 are allowed if the particle tower is multiple or has a string component. We also consider the CKN constraint coming from avoiding gravitational collapse which further requires in general α ≥ 1/D for the lightest tower. We analyse the case of the DGKT-CFI class of Type IIA orientifold models and show it has both particle and string towers below the species scale, so that a careful analysis of how the ADC is defined is needed. We find that this class of models obey but do not saturate the CEB. The UV/IR constraints found apply to both AdS and dS vacua. We comment on possible applications of these ideas to the dS Swampland conjecture as well as to the observed dS phase of the universe.

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Impact of Lorentz violation on anomalous magnetic moments of charged leptons

Crivellin

Kirk

Schreck

2022

J. High Energ. Phys.

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We address the question whether a violation of Lorentz symmetry can explain the tension between the measurement and the Standard-Model prediction of the anomalous magnetic moment of the muon, (g − 2)μ, and whether it can significantly impact the one of the electron, (g — 2)e. While anisotropic Lorentz-violating effects are, in general, expected to produce sidereal oscillations in observables, isotropic Lorentz violation (LV) in the charged-lepton sector could also feed into (g — 2)e,μ. However, we find that this type of Lorentz violation, parametrised via a dim-4 field operator of the Standard-Model Extension (SME), is already strongly constrained by the absence of vacuum Čerenkov radiation and photon decay. In particular, the observations of very-high-energetic astrophysical photons at LHAASO and of high-energetic electrons (muons) by the LHC (IceCube) place the most stringent two-sided bounds on the relevant SME coefficients $$ \overset{\circ }{c} $$ c ∘ (e) ($$ \overset{\circ }{c} $$ c ∘ (μ)). Therefore, any explanation of the tension in (g − 2)μ via isotropic Lorentz violation of the minimal spin-degenerate SME is excluded, and the possible size of its impact on (g − 2)e is very limited.

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Gravitational contributions to the electron $g$-factor

Cited by 9 publications

References 13 publications

Is the Universe actually holographic?

Is the Universe actually holographic?

IR/UV mixing, towers of species and swampland conjectures

Impact of Lorentz violation on anomalous magnetic moments of charged leptons

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