New Frontiers in Theoretical Physics - XXXV Convegno Nazionale di Fisica Teorica and GGI 10th anniversary

Session

Parallel 20 am

May 20, 2016, 10:50 AM

Galileo Galilei Institute, Firenze

22. Framing and localization in Chern-Simons theories with matter

Andrea Mauri (M)

5/20/16, 10:50 AM

Supersymmetric localization provides exact results that should match QFT computations in some regularization scheme. The agreement is particularly subtle in three dimensions where complex answers from the localization procedure sometimes arise. I will introduce this problem in the case of 1/6 BPS Wilson loops in ABJ(M) theory. I will show how the localization results are reproduced...

57. Giant Monopoles as a Dark Matter Candidate

Prof. Jarah Evslin (Institute of Modern Physics, CAS)

5/20/16, 10:50 AM

I will review recent challenges to WIMP dark matter models and describe how some of them are addressed by giant 't Hooft-Polyakov monopole models. These models exist in theories with a dark sector including a dark SU(2) gauge symmetry coupled to an adjoint Higgs and two fundamental fermions. Several consistency checks of such models will be described, including consistency with MACHO bounds...

28. Surprises from the resummation of ladders in the ABJ(M) cusp anomalous dimension

Dr Michelangelo Preti (Università degli Studi di Parma)

5/20/16, 11:10 AM

We study the cusp anomalous dimension in N=6 ABJ(M) theory, identifying a scaling limit in which the ladder diagrams dominate. The resummation is encoded into a Bethe-Salpeter equation that is mapped to a Schroedinger problem, exactly solvable due to the surprising supersymmetry of the effective Hamiltonian. In the ABJ case the solution implies the diagonalization of the U(N) and U(M) building...

13. WIMP Dark Matter at gamma-ray telescopes

Mr Filippo Sala (LPTHE Paris)

5/20/16, 11:10 AM

Weakly interactive massive particles (WIMP), as candidates of Dark Matter, motivate new physics at the TeV scale independently of electroweak naturalness. What will be the role of gamma-ray telescopes in probing this paradigm, also in comparison with other experiments, like colliders? I will examine this question in the case of electroweak multiplets, which constitute a WIMP ``prototype’’,...

25. Inflation with weakly broken Galileon symmetry

Luca Santoni (PI)

5/20/16, 11:30 AM

In Effective Field Theories (EFT), symmetries (exact and approximate) play a key role in legitimizing the size and the hierarchy of the Wilson coefficients. With this in mind, in the context of the EFT of single-field inflation, we will study the theoretical and phenomenological consequences of a weakly broken Galileon symmetry, providing novel inflationary scenarios in a class of accelerating...

45. Susy Scattering amplitudes, Wilson loops and integrability.

Alfredo Bonini (BO)

5/20/16, 11:30 AM

The gluon scattering amplitudes and the null polygonal Wilson loops in planar Super Yang-Mills N=4 are believed to be the same. Many tests have been done at the perturbative level, while at strong coupling the scattering amplitudes can be computed solving a minamal area problem, thanks to the AdS/CFT correspondence. As for the Wilson loops, a variant of the well-known Operator Product...

21. Higgs-regulated amplitudes in N = 4 SYM, the generalized cusp anomalous dimension and bound states of W-bosons

Silvia Davoli (PR)

5/20/16, 11:50 AM

We consider massive scattering amplitudes on the Coulomb branch of N = 4 SYM theory, obtained by giving a general vacuum expectation value to the scalars fields of the theory. Dual conformal invariance is still present in four-point amplitudes and the generalized cusp anomalous dimension characterizes its planar IR divergencies. The angle theta measures the relative orientation for Coulomb...

19. Weakly coupled baryonic dark matter

Andrea Mitridate (INFN)

5/20/16, 11:50 AM

In this talk I will describe Dark Matter (DM) arising as a composite state of a new confining gauge force and stable thanks to accidental symmetries, as recently proposed in the context of theories with new vector-like fermions. Differently from previous works, I will focus on the regime where the fermion masses are larger than the confinement scale. In this scenario DM is a baryonic...

2. Asymptotic Freedom versus Planar Duality in Gauge and String Theories

Marco Bochicchio (ROMA1)

5/20/16, 12:10 PM

For large-N confining asymptotically-free gauge theories with no perturbative mass scale we investigate the compatibility between the asymptotic freedom of the S-matrix and the planar duality of disk amplitudes of their would-be string solutions. Several implications for any would-be string solution of large-N QCD with massless quarks follow.

12. Gravitational waves from coalescing relativistic binaries

Dr Alessandro Nagar (IHES)

5/20/16, 12:10 PM

The direct detection by the LIGO detector of the gravitational waves emitted by a coalescing black hole binary (GW150914) has marked the beginning of gravitational wave astronomy. Motivated by the recent experimental result, I will review recent results about analytical effective-one-body (EOB) approach to the general-relativistic two-body dynamics, notably its completion using numerical...

40. Cubic interactions for Maxwell-Like higher spins

Mr Gabriele Lo Monaco (Università di Pisa)

5/20/16, 12:30 PM

After a brief review of the interaction problem in higher-spin theory, I will illustrate the construction of cubic vertices for higher-spin gauge fields described at free level by a new class of Lagrangians, termed Maxwell-like. The latter generalise the Fronsdal formulation to the case of reducible multiplets of massless particles and can be shown to be directly related to free tensionless...

18. Is the gravitational-wave ringdown a probe of the event horizon?

Edgardo Franzin (C)

5/20/16, 12:30 PM

It is commonly believed that the ringdown signal from a binary coalescence provides a conclusive proof for the formation of an event horizon after the merger. This expectation is based on the assumption that the ringdown waveform at intermediate times is dominated by the quasinormal modes of the final object. We point out that this assumption should be taken with great care, and that very...