Conveners
Formal
- Cheng-Wei Chiang (National Taiwan University / National Center for Theoretical Sciences)
Formal
- Kin-ya Oda (Tokyo Woman's Christian University)
Formal
- Ryuichiro Kitano (KEK)
We find a new contribution in wave-packet scatterings, which has been overlooked in the standard formulation of S-matrix. As a concrete example, we consider a two-to-two scattering of light scalars 's' by another intermediate heavy scalar 'Phi', in the Gaussian wave-packet formalism: ss → Phi → ss. This contribution can be interpreted as an “in-time-boundary effect” of s for the corresponding...
We define a set of fully Lorentz-invariant wave packets and show that it spans the corre- sponding one-particle Hilbert subspace, and hence the whole Fock space as well, with a manifestly Lorentz-invariant completeness relation (resolution of identity). The position- momentum uncertainty relation for this Lorentz-invariant wave packet deviates from the ordinary Heisenberg uncertainty...
Gravity can be regarded as a consequence of local Lorentz (LL) symmetry, which is essential in defining a spinor field in curved spacetime. The gravitational action may admit a zero-field limit of the metric and vierbein at a certain ultraviolet cutoff scale such that the action becomes a linear realization of the LL symmetry. Consequently, only three types of term are allowed in the...
It has been known that when a charged fermion scatters off a monopole, the fermion in the s-wave component must flip its chirality. Because of this feature, if there are two or more flavors of massless fermions, any superposition of the fermion states cannot be the final state of the s-wave scattering as it is forbidden by conservation of the electric and flavor charges. The unitary evolution...
