Theory of fundamental interactionsedited by G. Costa

Fundamental theory of piezotronics.

Due to polarization of ions in crystals with noncentral symmetry, such as ZnO, GaN, and InN, a piezoelectric potential (piezopotential) is created in the crystal when stress is applied. Electronics fabricated using the inner-crystal piezopotential as a gate voltage to tune or control the charge transport behavior across a metal/semiconductor interface or a p-n junction are called piezotronics. ...

The Fundamental Group of G-manifolds

Let M be a connected smooth G-manifold, where G is a connected compact Lie group. In this paper, we first study the relation between π1 (M) and π1 (M/G). Then we particularly focus on the case when M is a connected Hamiltonian G-manifold with an equivariant moment map φ. In [13], for compact M , we proved that π1 (M) = π1 (M/G) = π1 (Ma) for all a ∈ image(φ), where Ma is the symplectic quotient...

Unified Theory of Fundamental Interactions

Based on local gauge invariance, four different kinds of fundamental interactions in Nature are unified in a theory which has SU(3)c⊗SU(2)L⊗U(1)⊗s Gravitational Gauge Group gauge symmetry. In this approach, gravitational field, like electromagnetic field, intermediate gauge field and gluon field, is represented by gauge potential. Four kinds of fundamental interactions are formulated in the sim...

Fundamental Symmetries and Theory

Let me begin by thanking Bernard Frois and the Organizing Committee for making it possible for us to enjoy both the 1998 International Nuclear Physics Conference and the lovely city of Paris. My charge today is to summarize fundamental symmetries and theory, a topic with a rich history in nuclear physics. A generation ago nuclear studies of β decay helped established the V-A nature of the weak ...

Fundamental Theory of Statistical Inference