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Open Accessλϕ4 theory — Part II. the broken phase beyond NNNN(NNNN)LO
We extend the study of the two-dimensional euclidean ϕ4 theory initiated in ref. [1] to the ℤ2 broken phase. In particular, we compute in perturbation theory up to N4LO in the quartic coupling the vacuum energy, ...
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Open AccessTopological susceptibility and QCD axion mass: QED and NNLO corrections
We improve the precision of the topological susceptibility of QCD, and therefore of the QCD axion mass, by including O(αem) and NNLO corrections in the chiral expansion, which amount to 0.65(21)% and -0.71(29)% r...
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Open Accessλϕ4 theory — Part I. The symmetric phase beyond NNNNNNNNLO
Perturbation theory of a large class of scalar field theories in d < 4 can be shown to be Borel resummable using arguments based on Lefschetz thimbles. As an example we study in detail the λϕ4 theory in two dimen...
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Open AccessAxions from strings: the attractive solution
We study the system of axion strings that forms in the early Universe if the Peccei-Quinn symmetry is restored after inflation. Using numerical simulations, we establish the existence of an asymptotic solution...
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Open AccessThe power of perturbation theory
We study quantum mechanical systems with a discrete spectrum. We show that the asymptotic series associated to certain paths of steepest-descent (Lefschetz thimbles) are Borel resummable to the full result. Us...
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Article
Open AccessAxion phenomenology and θ-dependence from N f = 2 + 1 lattice QCD
We investigate the topological properties of N f = 2 + 1 QCD with physical quark masses, both at zero and finite temperature. We adopt stout imp...
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Open AccessThe QCD axion, precisely
We show how several properties of the QCD axion can be extracted at high precision using only first principle QCD computations. By combining NLO results obtained in chiral perturbation theory with recent Latti...
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Open AccessHiggs mass determination in supersymmetry
We present the state-of-the-art of the effective field theory computation of the MSSM Higgs mass, improving the existing ones by including extra threshold corrections. We show that, with this approach, the the...
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Open AccessThe last vestiges of naturalness
Direct LHC bounds on colored SUSY particles now corner naturalness more than the measured value of the Higgs mass does. Bounds on the gluino are of particular importance, since it radiatively “sucks” up the st...
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Open AccessMini-Split
The lack of evidence for new physics beyond the standard model at the LHC points to a paucity of new particles near the weak scale. This suggests that the weak scale is tuned and that supersymmetry, if present...
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Open AccessUniversality of the volume bound in slow-roll eternal inflation
It has recently been shown that in single field slow-roll inflation the total volume cannot grow by a factor larger than \( {e^{{S_{dS}}/2}} \) ...
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Open AccessA non Standard Model Higgs at the LHC as a sign of naturalness
Light states associated with the hierarchy problem affect the Higgs LHC production and decays. We illustrate this within the MSSM and two simple extensions applying the latest bounds from LHC Higgs searches. L...
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Open AccessOn Fayet-Iliopoulos terms and de Sitter vacua in supergravity: some easy pieces
We clarify a number of issues on Fayet-Iliopoulos (FI) terms in supergravity, kee** the formalism at a minumum and making use of explicit examples. We explain why, if the U(1) vector is massive everywhere in...
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Low scale flavor gauge symmetries
We study the possibility of gauging the Standard Model flavor group. Anomaly cancellation leads to the addition of fermions whose mass is inversely proportional to the known fermion masses. In this case all fl...
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Open AccessNon-universal minimal Z′ models: present bounds and early LHC reach
We consider non-universal ‘minimal’ Z′ models, whose additional U(1) charge is a non-anomalous linear combination of the weak hypercharge Y, the baryon number B and the partial lepton numbers (L ...
