 1512 Luis GonzalezMestres
 Tests and prospects of new physics at very high energy
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Feb 7, 15

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Abstract. Recent results and announcements by Planck and BICEP2 have led to important controversies in the fields of Cosmology and Particle Physics. As new ideas and alternative approaches can since then more easily emerge, the link between the Mathematical Physics aspects of theories and the interpretation of experimental results becomes more
direct. This evolution is also relevant for Particle Physics experiments at very high energy, where the interpretation of data on the highestenergy cosmic rays remains a major theoretical and phenomenological challenge. Alternative particle physics and cosmology can raise fundamental questions such as that of the structure of vacuum and spacetime. In particular, the simplified description of the physical vacuum contained in standard quantum field theory does not necessarily correspond to reality at a deeper level, and similarly for the relativistic spacetime based on four real variables. In a more general approach, the definition itself of vacuum can be a difficult task. The spinorial spacetime (SST) we suggested in 199697 automatically incorporates a local privileged space direction (PSD)
for each comoving observer, possibly leading to a locally anisotropic vacuum structure. As the existence of the PSD may have been confirmed by Planck, and a possible discovery of primordial Bmodes in the polarization of the cosmic microwave background radiation (CMB) may turn out to contain new evidence for the SST, we explore other possible implications of this approach to spacetime. The SST structure can naturally be at the origin of Quantum Mechanics at distance scales larger than the fundamental one if standard particles are dealt with as vacuum excitations. We also discuss possible implications of our lack of knowledge of the structure of vacuum, as well as related theoretical,
phenomenological and cosmological uncertainties. PreBig Bang scenarios and new ultimate constituents of matter (including superbradyons) are crucial open subjects, together with vacuum structure and the interaction between vacuum and standard matter.
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