10 papers · 1 filter
Competing bounds on the present-day time variation of fundamental constants
Thomas Dent, Steffen Stern, Christof Wetterich
We compare the sensitivity of a recent bound on time variation of the fine structure constant from optical clocks with bounds on time varying fundamental constants from atomic cloc…
Time variation of fundamental couplings and dynamical dark energy
Thomas Dent, Steffen Stern, Christof Wetterich
Scalar field dynamics may give rise to a nonzero cosmological variation of fundamental constants. Within different scenarios based on the unification of gauge couplings, the variou…
Composition-dependent long range forces from varying m_p/m_e
Thomas Dent
We relate possible cosmological variations in the mass ratio mu \equiv m_p/m_e and the fine structure constant alpha to long-range composition-dependent forces mediated by a scalar…
Varying alpha, thresholds and extra dimensions
Thomas Dent
We consider variations of coupling strengths and mass ratios in and beyond the Standard Model, in the light of various mechanisms of mass generation. In four-dimensional unified mo…
Modular symmetry, twisted sectors and flavour
Thomas Dent
We investigate the implications for fermion mass models in heterotic orbifolds of the modular symmetry mixing twisted states localized at different fixed points. We show that, unli…
A realistic formulation of approximate CP
Thomas Dent, Joaquim Silva-Marcos
CP violation in the SM is naturally implemented as a small imaginary perturbation to real Yukawa couplings. For example, a large CP asymmetry in B_d decays can arise if the imagina…