#### Pregled bibliografske jedinice broj: 397352

## Generalized Uhlenbeck-Goudsmit Hypothesis, ‘ Magnetic’ Sa and ‘ Electric’ Za Spins

Generalized Uhlenbeck-Goudsmit Hypothesis, ‘ Magnetic’ Sa and ‘ Electric’ Za Spins, 2008. (e-preprint arhive).

**Naslov**

Generalized Uhlenbeck-Goudsmit Hypothesis, ‘ Magnetic’ Sa and ‘ Electric’ Za Spins

(Generalized Uhlenbeck-Goudsmit Hypothesis, ‘ Magnetic’ S{;a}; and ‘ Electric’ Z{;a}; Spins)

**Autori**

Ivezić, Tomislav

**Izvornik**

ArXiv: 0801.0851

**Vrsta, podvrsta**

Ostale vrste radova, e-preprint arhive

**Godina**

2008

**Ključne riječi**

Generalized Uhlenbeck-Goudsmit hypothesis; mangetic and electric spins

**Sažetak**

In this paper the connection between the dipole moment tensor Dab and the spin four-tensor Sab is formulated in the form of the generalized Uhlenbeck- Goudsmit hypothesis, Dab = gSSab. It is also found that the spin four-tensor Sab can be decomposed into two 4-vectors, the usual “ space-space” intrinsic angular momentum Sa, which will be called ‘ magnetic’ spin (mspin), and a new one, the “ time-space” intrinsic angular momentum Za, which will be called ‘ electric’ spin (espin). Both spins are equally well physical quantities. Taking into account the generalized Uhlenbeck-Goudsmit hypothesis, the decomposition of Sab and the decomposition of Dab into the dipole moments ma and da we find that an electric dipole moment (EDM) of a fundamental particle, as a four-dimensional geometric quantity, is determined by Za and not, as generally accepted, by the spin S. Also it is proved that neither the T inversion nor the P inversion are good symmetries in the 4D spacetime. In this geometric approach only the world parity W, Wxa = − xa, is well-defined in the 4D spacetime. Different shortcomings in EDM experiments are discussed. One of the main shortcomings is that in all experiments the usual transformations of the 3D fields E and B (A. Einstein, Ann. Physik 17, 891 (1905)) are always considered as that they are relativistically correct Lorentz transformations (LT) of E and B. However, as proved in, e.g., T. Ivezi´c, Found. Phys. Lett. 18, 301 (2005), these transformations are not the LT and they drastically differ from the LT of the relativistically correct 4D electric and magnetic fields. This is an essential reason why the fact that no EDM has yet been found does not mean that there is no EDM of the size predicted in this paper. The other reasons are also discussed.

**Izvorni jezik**

Engleski

**Znanstvena područja**

Fizika

**POVEZANOST RADA**

**Projekt / tema**

098-1191005-2879 - Fizika teških iona (Zoran Basrak, )

**Ustanove**

Institut "Ruđer Bošković", Zagreb

**Autor s matičnim brojem:**

Tomislav Ivezić, (71760)