Holography, conformal field theories, and lattice

Contribution List

2. Holography, Conformal invariance and phase transitions in QCD-like theories

Elias Kiritsis

27/06/2016, 10:00

4. N=1 Euler Anomaly Flow from Dilaton Effective Action

Roman Zwicky

27/06/2016, 11:30

We consider N=1 supersymmetric gauge theories in the conformal window. The running of the gauge coupling is absorbed into the metric by applying a suitable matter superfield- and Weyl-transformation. The computation becomes equivalent to one of a free theory in a curved background carrying the information of the renormalisation group flow. We use the techniques of conformal anomaly...

1. The Quantum Simplicial Lattice for Conformal Field theory on Curved Manifolds.

Richard Brower

27/06/2016, 13:30

3. Large mass hierarchies from strongly-coupled dynamics

Maurizio Piai

27/06/2016, 14:30

5. Exact results in (Super) QFT: From Asymptotic Freedom to Asymptotic Safety

Francesco Sannino

27/06/2016, 16:00

I will present new exact results in four-dimensional quantum field theory that led to the discovery to asymptotically safe theories in four dimensions without supersymmetry. I will also discuss supersymmetric extensions and present new exact results that make use of a number of non-perturbative tools ranging from the unitary of the conformal operators to the a-theorem and maximisation. The...

9. An ambitious alternative: Partial Compositeness

Luca Vecchi

28/06/2016, 09:00

10. Gauge theories of partial compositeness. Scenarios for the Lattice and the LHC

Gabriele Ferretti

28/06/2016, 10:00

We present a class of gauge theories in which the Higgs boson arises as a pseudo-Nambu-Goldstone boson and top-partners arise as bound states of three hyperfermions. All models have additional pNGBs in their spectrum that should be accessible at LHC, including one that can explain the current diphoton excess at 750~GeV. We discuss how the Lattice can help answering some of the questions about...

11. Higgs Coupling measurements and UV implications

Christoph Englert

28/06/2016, 11:30

I will discuss the implications of recent LHC measurements for Higgs physics using effective field theory methods. On the basis of these results I will discuss the status of concrete UV scenarios, in particular composite Higgs models.

12. Composite Higgs Dynamics on the Lattice

Claudio Pica

28/06/2016, 13:30

We investigate the spectrum of the SU(2) gauge theory with Nf = 2 flavors of fermions in the fundamental representation, in the continuum, using Lattice simulations [1,2,3]. This model provides a minimal template which has been used for different strongly coupled extensions of the Standard Model ranging from composite (Goldstone) Higgs models [4] to intriguing types of dark matter...

13. Composite Higgs model based on a conformal fixed point

Anna Hasenfratz

28/06/2016, 14:30

We construct a prototype BSM model where the Higgs boson is a pseudo Nambu-Goldstone boson by combining 4 light (massless) flavors and 8 heavy flavors. In the infrared, the SU(4) chiral symmetry is spontaneously broken , while in the ultraviolet it exhibits the properties of the $N_f=12$ conformal fixed point. The running coupling of this system ``walks" and the energy range of walking can...

14. Crossing the conformal window: SU(2) with 2-8 fundamental fermions

Kari Rummukainen

28/06/2016, 16:00

SU(2) gauge theory is asymptotically free with Nf <= 10 fundamental representation fermions. Above approximately 6 fermion flavours the theory is expected to have an infrared fixed point. We study the evolution of the coupling using the gradient flow step scaling mehtod, and investigate the behaviour of the hadron spectrum as we cross from the confining into the conformal region.

15. Theta angle, the quark mass, and the conformal window in holographic QCD

Mätti Jarvinen

29/06/2016, 09:00

I discuss holographic QCD in the Veneziano limit (large N_c and N_f with x=N_f/N_c fixed) where quarks are fully backreacted to gluons. When all quark flavors are identical, QCD in this limit has two parameters in addition to Lambda_QCD, namely the quark mass and the theta angle. I demostrate how these parameters can be included in holographic QCD, and discuss the resulting phase diagram. At...

16. Direct test of the gauge/gravity duality for the D0-brane system at finite N

Jun Nishimura

29/06/2016, 10:00

We test the gauge/gravity duality conjecture directly by using Monte Carlo methods to study the strongly coupled regime of the relevant gauge theory. In particular, we focus on the D0-brane system, which is described by a one-dimensional gauge theory with 16 supercharges. Extending our previous work, which confirmed the duality in the large-N limit, we investigate whether the duality...

17. Magnetically induced phenomena and Holographic QCD

Umut Gürsoy

29/06/2016, 11:30

18. Recent results on large N gauge theories on the lattice

Tony Gonzalez-Arroyo

29/06/2016, 13:30

We review progress made recently in obtaining results on large N gauge theories using the lattice formulation together with the concept of volume independence

23. Volume independence beyond large N

Marga Garcia-Perez

29/06/2016, 14:30

In the limit of infinite numbers of coulours in Yang-Mills theory, the interplay between volume and group degrees of freedom has led to the concept of volume independence through Eguchi-Kawai reduction. We will discuss an attempt to extend this idea beyond the large N limit. A few non-perturbative examples will be presented, including the running of the SU(N) ’t Hooft coupling and the 2+1...

19. Large N mesons

Gunnar Bali

29/06/2016, 16:00

22. Near-conformal composite Higgs or PNGB with partial compositeness?

Julius Kuti

30/06/2016, 09:00

Based on recent analysis of the LatHC collaboration I will review critical features of a minimal composite Higgs model close to the conformal window. Challenging problems of the near-conformal paradigm will be compared with PNGB based partial compositeness.

21. A Spartan model for the LHC Diphoton Excess

Tom Appelquist

30/06/2016, 10:00

I will describe a very simple model accommodating the reported 750 GeV diphoton excess seen in the first 13-TeV run of the LHC. It leads to testable predictions, in particular for di-lepton production, at higher integrated luminosity. A new gauge sector with its own SU(2) symmetry group is appended to the minimal standard model. A new complex doublet scalar field provides mass for the heavy...

24. A composite model for flavor and diphoton anomalies

David Marzocca

30/06/2016, 11:30

Among all LHC results, the most exciting signs of deviations from the SM are, on the one hand, a series of hints of violation of lepton-flavor universality in various B-meson decays and, on the other hand, the excess in diphoton invariant mass distribution at 750GeV. In this talk I discuss a class of new physics models with composite dynamics aimed at addressing both sets of anomalies in a...

20. Talk 6: Determining the β-function in Nf = 3 QCD

Alberto Ramos

30/06/2016, 13:30

0. Lattice QCD averages from non-equilibrium transformations

Marco Panero

30/06/2016, 14:30

We discuss an efficient method to compute expectation values of generic observables in lattice Monte Carlo calculations, by evaluating the work performed during a non-equilibrium transformation between configurations in different equilibrium ensembles. This technique, which relies on a theorem proven by Christopher Jarzynski in 1997, has potential applications for a broad spectrum of...

26. Bump hunting at the LHC

Christos Leonidopoulos (ATLAS)

30/06/2016, 16:00