We present a systematic approach to the classification of the UV properties of higher dimensional operators spanned by $\Phi^\dagger \Phi$ and ordinary derivatives thereof (e.g. $\partial_\mu (\Phi^\dagger \Phi)\partial^\mu (\Phi^\dagger \Phi) , (\Phi^\dagger \Phi)^3, (\Phi^\dagger \Phi)^4, \dots$) in Higgs Effective Field Theories. The procedure is purely algebraic and thus...

We explore a possibility to UV-complete the Standard Model in an asymptotically safe manner. We assume the existence of $N_F$ new types of vector-like fermions which minimally couple to $SU(3)_C$ and/or $SU(2)_L$ and modify the running of the corresponding gauge couplings in such a way that at least one of them is not asymptotically free anymore. If additionally the BSM fermions carry a...

We have recently proposed a new regularization framework based on the loop-tree duality theorem. This theorem allows to rewrite loop level amplitudes in terms of tree-level like structures and phase-space integrations. In consequence, it is possible to combine naturally real and virtual contributions at integrand level. Moreover, by introducing a proper momentum mapping, a complete local...

The thermalization process of an out-of-equilibrium boost-invariant strongly interacting non-Abelian

plasma is investigated using a holographic method. Boundary sourcing, a distortion of the boundary metric,

is employed to drive the system far from equilibrium. Thermalization is analyzed in the fully dynamical

system through nonlocal probes: the equal-time two-point correlation function of...

Solving by a string theory the 't Hooft large-$N$ expansion of QCD is a long-standing problem that resisted all the attempts despite the advent of the celebrated gauge/gravity duality in the framework of string theory. We demonstrate that in the canonical string framework such a solution does not actually exist because an inconsistency arises between the renormalization properties of the...

The top-down holographic Witten-Sakai-Sugimoto model for low-energy QCD, augmented by finite quark masses, has recently been found to be able to reproduce the decay pattern of the scalar glueball candidate f0(1710) on a quantitative level. We show that this model predicts a narrow pseudoscalar glueball heavier than the scalar glueball and with a very restricted decay pattern involving eta or...

We generalize the semiclassical treatment of graviton radiation to

gravitational scattering at very large energies $\sqrt{s}\gg m_P$ and finite

scattering angles $\Theta_s$, so as to approach the collapse regime of impact

parameters $b \simeq b_c \sim R\equiv 2G\sqrt{s}$. Our basic tool is the

extension of the recently proposed, unified form of radiation to the string-based ACV

...

We present a D-brane realisation of the (non-)Abelian $\mathscr{N}=2^*$ theory. For $\Omega$ deformation we compute suitable topological amplitudes in this setup. These amplitudes are expressed as a double series expansion. The coefficients determine couplings of higher-dimensional operators in the effective supergravity action that involve powers of the anti-self-dual $\mathscr{N}=2$ chiral...

A novel non-linear symmetry of black hole entropy is presented : Freudenthal duality, defined as an anti-involutive, non-linear map acting on symplectic spaces.

After a general introduction on some aspects of extended (super)gravity theories in four dimensions and the structure of their e.m. duality orbits, I will consider the e.m. duality Lie groups "of type E7", and the corresponding notion...

We investigate light massive string states that appear at brane

intersections. They replicate the massless spectrum in a richer

fashion and may be parametrically lighter than standard Regge

excitations. We compute tri-linear Yukawa couplings of such

open-string states to massless ones and to one another. Due to

ambiguities in the normalisation of the vertex operators, that involve

twist...