We extend our investigation of the IR effects on the local dynamics of matter
fields in quantum gravity. Specifically we clarify how the IR effects depend on
the change of the quantization scheme: different parametrization of the metric
and the ma...
We extend our investigation of soft graviton effects on the microscopic
dynamics of matter fields in de Sitter space. We evaluate the quantum equation
of motion in generic gauge theories. We find that the Lorentz invariance can be
respected and th...
The scale invariance of the quantum fluctuations in de Sitter space leads to
the appearance of de Sitter symmetry breaking infra-red logarithms in the
graviton propagator. We investigate physical effects of soft gravitons on the
local dynamics of ...
We extend our investigation on a possible de Sitter symmetry breaking
mechanism in non-linear sigma models. The scale invariance of the quantum
fluctuations could make the cosmological constant time dependent signaling the
de Sitter symmetry break...
We investigate infra-red dynamics of the non-linear sigma model in de Sitter
space. In the presence of minimally coupled massless scalar fields, the de
Sitter symmetry is dynamically broken and physical constants become time
dependent. We find tha...
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