Tadpole cancellation in top-quark condensation

Top Quark Condensation 1.1 Preliminary

We review a class of dynamical models in which top condensation occurs at the weak scale, giving rise to the large top quark mass and other phenomena. This typically requires a color embedding, SU (3) c → SU (3) 1 × SU (3) 2 , ergo " Topcolor. " Topcolor suggests a novel route to technicolor models in which sequential quarks condense under the Topcolor interaction to break electroweak symmetrie...

Top quark condensation – a review

Exact Cancellation of Quadratic Divergences in Top Condensation Models

We discuss the hierarchy problem and the corresponding quadratic divergences in the top mode Standard Model. Quadratic divergences appear at each order 1/Nc since fermionic and bosonic contributions are of different order 1/Nc. It is shown that the full dynamical system to all orders in 1/Nc admits a solution, where the sum of all quadratic divergent contributions disappears. ∗Email: ab at hep....

Tadpole Cancellation in Unoriented Liouville Theory

The tadpole cancellation in the unoriented Liouville theory is discussed. Using two different methods — the free field method and the boundary-crosscap state method, we derive one-loop divergences. Both methods require two D1-branes with the symplectic gauge group to cancel the orientifold tadpole divergence. However, the finite part left is different in each method and this difference is studi...

Top quark in theory

Of the particles seen so far in collider experiments, the top quark is no doubt the most expensive, and the most glamorous. It is therefore the center of attention at the Tevatron and the LHC, until of course a new star, Higgs, comes along. Expressed less colloquially, the top quark is considered an interesting study object because it has many quantum numbers and thus couples to almost all othe...