Fundamental Interactions, The Next Revolutions

• Francesco Sannino

Room: Salle Fontannes

Duality along the RG flow

• Borut Bajc

Room: Salle Fontannes I will show an example of exact duality along the RG flow between the electric and magnetic versions of SQCD in D=4. In the vicinity of Nf=3Nc/2 the non-perturbative electric flow can be calculated in terms of the perturbative electric one.

How to naturally break electroweak symmetry

• Teng Ma

Room: Salle Fontannes

Effective actions and the Conformal Scale for physics BSM

• Claudio Coriano

Room: Salle Fontannes

Confronting (composite) DM models and MOND with rotation curves and astrophysical observations

• Mads Frandsen

Room: Salle Fontannes

Central charges and their constraints

• Vladimir Prochazka

Room: Salle Fontannes I will introduce the idea of central charges and how they can imply constraints on UV/IR asymptotics of RG flows akin to 't Hooft anomalies. I will review some results on their monotonicity properties and the so-called a-theorem stating that the central charge 'a' decreases along the RG flow. I will then show how can central charges be computed in realistic theories and present examples. These examples will include both asymptotically safe and asymptotically free theories. Finally I will discuss the relation between central charges and certain convergent sum rules, which can provide a way of putting the a-theorem on lattice.

RG functions in semi-simple gauge theories at large Nf

• Nicola Dondi

Room: Salle Fontannes

Forging a link between quantum gravity and (beyond) Standard Model physics

• Aaron Held

Room: Salle Fontannes Renormalization Group flows provide a link between Planck- and electroweak-scale physics, that could allow to test implications of quantum gravity at accessible energy scales [1]. Systematic truncations suggest the existence of a regime of asymptotically safe quantum gravity, in which gravity fluctuations induce a UV-completion of the matter sector. Within this scenario, the paradigm of asymptotic safety surpasses the predictive power of the Standard Model. It could retrodict the top mass, the bottom mass and the Abelian gauge coupling from first principles in a microscopic model including quantum gravity [2,3]. In our approximation, quantitative agreement with observations is only possible if the electric charge ratio of bottom and top lies in close vicinity to the Standard-Model value of Qb/Qt=-1/2. More generally, the asymptotic safety paradigm could give guidance for model building beyond the Standard Model. For instance, it places novel constraints on grand unification [4] and dark matter searches [5]. References: [1] A. Eichhorn and A. Held, Phys. Rev. D 96, no. 8, 086025 (2017). [2] A. Eichhorn and A. Held, Phys. Lett. B 777, 217 (2018). [3] A. Eichhorn and A. Held, arXiv:1803.04027 (2018). [4] A. Eichhorn, A. Held and C. Wetterich, arXiv:1711.02949 (2017). [5] A. Eichhorn, A. Held and P. Vander Griend, arXiv:1802.08589 (2018)

The flavor puzzle and the Goldstone-Higgs

• Simone Blasi

Room: Salle Fontannes We propose a unified model of scalar particles that addresses the flavour hierarchies, solves the strong CP problem, delivers a dark matter candidate, and provides the trigger for electroweak symmetry breaking. Besides furnishing a unification of the recently proposed axiflavon with a Goldstone-Higgs sector, the scenario can also be seen as adding a model of flavour (and strong CP conservation along with axion dark matter) to elementary Goldstone-Higgs setups.

Dark Bound States of Vector-like fermions

• Juri Smirnov

Room: Salle Fontannes I will discuss the possibility that dark matter in the universe is composed of bound states of fermions with vector-like masses. Those particles are well motivated theoretically in allow in particular to realise asymptotically safe extensions of the Standard Model. I will show that those fermions can form bound states due to a new gauge group, which confines above the temperature of the QCD phase transition or in the most economical set-up the confinement can be due to Standard model strong interactions. Thus leading to weakly intreating massive particles made of strongly interacting components.

Probing Baryogenesis through the Higgs Self-Coupling

• Manuel Reichert

Room: Salle Fontannes The link between a modified Higgs self-coupling and the strong first-order phase transition necessary for baryogenesis is well explored for polynomial extensions of the Higgs potential. We broaden this argument beyond leading polynomial expansions of the Higgs potential to higher-order polynomial terms and to non-polynomial Higgs potentials with the use of the functional renormalization group. In all cases we find that a strong first-order phase transition manifests itself in an enhancement of the Higgs self-coupling by at least 50%, implying that such modified Higgs potentials should be accessible at the LHC. The modifications of the Higgs potential can be linked to e.g. asymptotically safe extensions of the Standard Model.

An almost elementary Higgs: theory and practice

• Daniele Barducci

Room: Salle Fontannes

Flavor Physics and Flavor Anomalies in Minimal Fundamental Partial Compositeness

• Anders Thomsen

Room: Salle Fontannes I would like to present the paper of the same name, written in collaboration with F. Sannino, P. Stangl, and D. Straub. I will breifly review the Fundamental Partial Compositeness framework which is a realistic model for composite dynamics. I then present our analysis of the falvor physics in the minimal model. In particular the analysis finds parameter points that pass the current precision tests. At the same time the new physics contribution to the flavor physics is found to be testable at both current and future experiments. I will pay particular attention the hints of lepton flavor violation in the R_{K^{(\ast)}} and R_{D^{(\ast)}} observables.

Large mass hierarchies in strongly coupled theories with multi-scale dynamics

• Daniel Elander

Room: Salle Fontannes Strongly coupled theories exhibiting walking dynamics provide a scenario for beyond the Standard Model physics, in which electro-weak symmetry is broken dynamically and the large hierarchy between the electro-weak and Planck energy scales is naturally generated. Due to the spontaneous breaking of approximate scale invariance, a light dilaton can be expected to be present in the spectrum. In this talk, we present an example of a strongly coupled theory with multi-scale dynamics, in which there is a light composite scalar state. Using gauge-gravity duality, we compute the spectrum of scalar and tensor glueballs by studying an 8-scalar sigma-model in five dimensions, the solutions of which include the one-parameter family of backgrounds dual to the baryonic branch of the Klebanov-Strassler field theory. We argue that far out on the moduli space, the ratio of explicit to spontaneous breaking of scale invariance can be made small, leading one of the scalar states, the pseudo-dilaton, to become parametrically light.

Unearthing the electroweak structure of warped extra-dimensions at colliders

• Abhishek Iyer

Room: Salle Fontannes

Probing the nature of Dark Matter at the ILC

• Daniel Locke

Room: Salle Fontannes We analyse the potential of the proposed international linear collider to detect Dark Matter (DM) and determine its properties. In many models stability of Dark Matter particles D is ensured by conservation of a new quantum number referred to as D-parity. Our models also contain charged D-odd particles $D^{\pm}$ with the same spin as D. In this work, we study two minimal consistent models corresponding to scalar and fermionic DM. The first of which is the inert higgs doublet model (I2HDM), which is a $Z_2$ symmetric Two Higgs Doublet Model, with the lightest neutral scalar being identified as D. The latter contains an SU(2) doublet of vector-like Dirac fermions, and an additional neutral singlet fermion. In this model, D is a mixture of neutral fermion singlet and doublet. For minimal fermionic DM, we perform an analysis of constraints of the parameter space, coming from DM relic density, DM direct detection, and collider. We propose a method to determine the mass of DM and distinguish its spin, in the process $e^+e^- \to D^+D^- \to DDW^+W^-\ to DD (q\bar{q})(\ell\nu)$ with a signature dijet + $\mu$ (or $e$) + missing mass.