207 research outputs found
Scattering amplitudes of fermions on monopoles
We consider scattering processes involving massless fermions and βt Hooft-Polyakov magnetic monopoles in a minimal SU(2) model and in the Grand Unified SU(5) theory. We construct expressions for on-shell amplitudes for these processes in the J = 0 partial wave using the spinor helicity basis consisting of single-particle and pairwise helicities. These processes are unsuppressed and are relevant for the monopole catalysis of proton decay. The amplitudes for the minimal processes involving a single fermion scattering on a monopole in the initial state and half-fermion solitons in the final state are presented for the first time and are used to obtain the amplitudes for processes involving more fermions in the initial state and integer fermion numbers in the final state. A number of such anomalous and non-anomalous processes, along with their amplitude expressions, are written down for the SU(5) GUT model
Higgsploding universe
Higgsplosion is a dynamical mechanism that introduces an exponential suppression of quantum fluctuations beyond the Higgsplosion energy scale E β and further guarantees perturbative unitarity in multi-Higgs production processes. By calculating the Higgsplosion scale for spin 0, 1 / 2 , 1 and 2 particles at leading order, we argue that Higgsplosion regulates all n-point functions, thereby embedding the standard model of particle physics and its extensions into an asymptotically safe theory. There are no Landau poles and the Higgs self-coupling stays positive. Asymptotic safety is of particular interest for theories of particle physics that include quantum gravity. We argue that in a Hippsloding theory one cannot probe shorter and shorter length scales by increasing the energy of the collision beyond the Higgsplosion energy and there is a minimal length set by r β βΌ 1 / E β that can be probed. We further show that Higgsplosion is consistent and not in conflict with models of inflation and the existence of axions. There is also a possibility of testing Higgsplosion experimentally at future high energy experiments
Summing the Instanton Series in N=2 Superconformal Large-N QCD
We consider the multi-instanton collective coordinate integration measure in
N=2 supersymmetric SU(N) gauge theory with N_F fundamental hypermultiplets. In
the large-N limit, at the superconformal point where N_F=2N and all VEVs are
turned off, the k-instanton moduli space collapses to a single copy of
AdS_5*S^1. The resulting k-instanton effective measure is proportional to
N^{1/2} g^4 Z_k^(6), where Z_k^(6) is the partition function of N=(1,0) SYM
theory in six dimensions reduced to zero dimensions. The multi-instanton can in
fact be summed in closed form. As a hint of an AdS/CFT duality, with the usual
relation between the gauge theory and string theory parameters, this precisely
matches the normalization of the charge-k D-instanton measure in type IIB
string theory compactified to six dimensions on K3 with a vanishing two-cycle.Comment: 12 pages, amslate
Dark matter and leptogenesis linked by classical scale invariance
In this work we study a classically scale invariant extension of the Standard Model that can explain simultaneously dark matter and the baryon asymmetry in the universe. In our set-up we introduce a dark sector, namely a non-Abelian SU(2) hidden sector coupled to the SM via the Higgs portal, and a singlet sector responsible for generating Majorana masses for three right-handed sterile neutrinos. The gauge bosons of the dark sector are mass-degenerate and stable, and this makes them suitable as dark matter candidates. Our model also accounts for the matter-anti-matter asymmetry. The lepton flavour asymmetry is produced during CP-violating oscillations of the GeV-scale right-handed neutrinos, and converted to the baryon asymmetry by the electroweak sphalerons. All the characteristic scales in the model: the electro-weak, dark matter and the leptogenesis/neutrino mass scales, are generated radiatively, have a common origin and related to each other via scalar field couplings in perturbation theory
Gravitational waves and dark matter from classical scale invariance
In this paper we consider a minimal classically conformal U(1) model of
fermionic dark matter. We calculate the one loop effective potential which
generates the mass scale quantum mechanically via dimensional transmutaion in
the spirit of Gildener and Weinberg, and examine the effects of the new dark
sector on the Standard Model Higgs as well as how the dark fermions receive a
mass and can produce the observed relic abundance. We then consider constraints
on the model coming from collider and direct detection experiments before
calculating the thermal effects on the potential in the early universe. We
examine the nature and conditions for a strongly first order phase transition
in our model and calculate the associated gravitational wave signal and compare
to the sensitivities of current and proposed experiments
- β¦