scholarly journals Light neutrino masses from gravitational condensation: the Schwinger–Dyson approach

2021 ◽  
Vol 81 (6) ◽  
Author(s):  
Gabriela Barenboim ◽  
Jessica Turner ◽  
Ye-Ling Zhou
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Degrees Of Freedom ◽  
Chiral Symmetry Breaking ◽  
Planck Scale ◽  
Neutrino Masses ◽  
Beyond The Standard Model ◽  
Standard Model Particle ◽  
Particle Content ◽  
The Standard Model

AbstractIn this work we demonstrate that non-zero neutrino masses can be generated from gravitational interactions. We solve the Schwinger–Dyson equations to find a non-trivial vacuum thereby determining the neutrino condensate scale and the number of new particle degrees of freedom required for gravitationally induced dynamical chiral symmetry breaking. We show for minimal beyond the Standard Model particle content, the scale of the condensation occurs close to the Planck scale.

scholarly journals Sub-GeV-scale signatures of hidden braneworlds up to the Planck scale in a SO(3,1)-broken bulk

2019 ◽  
Vol 34 (05) ◽  
pp. 1950029 ◽  
Author(s):  
Coraline Stasser ◽  
Michaël Sarrazin
Keyword(s):  
Standard Model ◽  
Phenomenological Model ◽  
Quantum Dynamics ◽  
Scale Up ◽  
Planck Scale ◽  
Energy Scale ◽  
Beyond The Standard Model ◽  
Coupling Constant ◽  
The Standard Model ◽  
Gut Scale

Many-brane Universes are at the heart of several cosmological scenarios related to physics beyond the Standard Model. It is then a major concern to constrain these approaches. Two-brane Universes involving [Formula: see text]-broken 5D bulks are among the cosmological models of interest. They also allow considering matter exchange between branes, a possible way to test these scenarios. Neutron disappearance (reappearance) toward (from) the hidden brane is currently tested with high-precision experiments to constrain the coupling constant [Formula: see text] between the visible and hidden neutron sectors. When dealing with the sub-GeV-scale quantum dynamics of fermions, any pair of braneworlds can be described by a noncommutative two-sheeted space–time [Formula: see text] from which [Formula: see text] emerges. Nevertheless, the calculation of the formal link between [Formula: see text] for a neutron and [Formula: see text]-broken 5D bulks remains an open problem until now although necessary to constrain these braneworld scenarios. Thanks to a phenomenological model, we derive [Formula: see text] — for a neutron — between the two braneworlds endowed with their own copy of the Standard Model in an [Formula: see text]-broken 5D bulk. Constraints on interbrane distance and brane energy scale (or brane thickness) are discussed. While brane energy scale below the GUT scale is excluded, energy scale up to the Planck limit allows neutron swapping detection in forthcoming experiments.

EFFECTS OF PAIRING CORRELATIONS ON THE ISOSPIN-SYMMETRY-BREAKING CORRECTION TO SUPER-ALLOWED 0+ → 0+ FERMI TRANSITIONS WITHIN THE HIGHER TAMM–DANCOFF APPROACH

2011 ◽  
Vol 20 (02) ◽  
pp. 274-280 ◽  
Author(s):  
JULIEN LE BLOAS ◽  
LUDOVIC BONNEAU ◽  
PHILIPPE QUENTIN ◽  
JOHANN BARTEL
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Electromagnetic Interaction ◽  
Sensitivity Study ◽  
Transition Matrix Element ◽  
Beyond The Standard Model ◽  
Isospin Symmetry ◽  
The Standard Model ◽  
Isospin Symmetry Breaking ◽  
Pairing Correlations

Super-allowed 0+ → 0+ Fermi transitions provide a test at low energy of the Standard Model of elementary interactions. The isospin-symmetry breaking due to the electromagnetic interaction at a nuclear level is a fundamental theoretical tool for the understanding of weak processes beyond the Standard Model. Within the Higher Tamm–Dancoff description of correlated nuclear states, we calculate the isospin-symmetry breaking correction δc to the Fermi transition matrix element. A sensitivity study on the T = 0 pairing correlations is carried out and some tests of model ingredients are performed. The obtained correction is of the order of 0.15~0.2% for plausible strengths in the T = 1 and T = 0 channels of the residual interaction. This is expected to constitute a lower bound.

scholarly journals From old symmetries to new symmetries: Quarks, leptons and B-L

2014 ◽  
Vol 29 (29) ◽  
pp. 1430066 ◽  
Author(s):  
Rabindra N. Mohapatra
Keyword(s):  
Standard Model ◽  
Weak Interactions ◽  
Low Energy ◽  
Neutrino Masses ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Recent Developments

The Baryon–Lepton difference (B-L) is increasingly emerging as a possible new symmetry of the weak interactions of quarks and leptons as a way to understand the small neutrino masses. There is the possibility that current and future searches at colliders and in low energy rare processes may provide evidence for this symmetry. This paper provides a brief overview of the early developments that led to B-L as a possible symmetry beyond the standard model, and also discusses some recent developments.

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