scholarly journals Quantum field theory of interacting dark matter and dark energy: Dark monodromies

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
Guido D’Amico ◽  
Teresa Hamill ◽  
Nemanja Kaloper
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Matter ◽  
Dark Energy ◽  
Quantum Field

scholarly journals ISSUES WITH VACUUM ENERGY AS THE ORIGIN OF DARK ENERGY

2012 ◽  
Vol 27 (27) ◽  
pp. 1250154 ◽  
Author(s):  
HOURI ZIAEEPOUR
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Energy ◽  
Particle Physics ◽  
Vacuum Energy ◽  
A Priori ◽  
Higgs Field ◽  
Scalar Fields ◽  
Vacuum Energy Density ◽  
Quantum Field

In this paper, we address some of the issues raised in the literature about the conflict between a large vacuum energy density, a priori predicted by quantum field theory, and the observed dark energy which must be the energy of vacuum or include it. We present a number of arguments against this claim and in favor of a null vacuum energy. They are based on the following arguments: A new definition for the vacuum in quantum field theory as a frame-independent coherent state; results from a detailed study of condensation of scalar fields in Friedmann–Lemaître–Robertson–Walker (FLRW) background performed in a previous work; and our present knowledge about the Standard Model of particle physics. One of the predictions of these arguments is the confinement of nonzero expectation value of Higgs field to scales roughly comparable with the width of electroweak gauge bosons or shorter. If the observation of Higgs by the LHC is confirmed, accumulation of relevant events and their energy dependence in near future should allow us to measure the spatial extend of the Higgs condensate.

scholarly journals Some remarks on axion dark matter, dark energy and energy of the quantum vacuum

2020 ◽  
Vol 35 (02n03) ◽  
pp. 2040036
Author(s):  
V. M. Mostepanenko
Keyword(s):  
Field Theory ◽  
Dark Matter ◽  
Dark Energy ◽  
Cosmological Constant ◽  
Physical Significance ◽  
Quantum Field ◽  
Quantum Vacuum ◽  
Casimir Forces ◽  
Nucleon Interaction ◽  
The Difference

In connection with the problem of dark matter, we discuss recent results on constraining the parameters of axion-to-nucleon interaction following from the experiment on measuring the difference of Casimir forces. It is shown that this experiment not only leads to competitive constraints, but provides stronger support to other constraints obtained in Casimir physics so far. The description of dark energy by means of cosmological constant originated from the quantum vacuum is considered in terms of the renormalization procedures in quantum field theory. It is argued that only the renormalized value of cosmological constant directly connected with the observed density of dark energy is of physical significance, so that some statements in the literature concerning the vacuum catastrophe may be considered as an exaggeration.

Quantum field theory in curved spacetime and the dark matter problem

2007 ◽  
Author(s):  
A. A. Grib ◽  
Yu. V. Pavlov ◽  
Piotr Kielanowski ◽  
Anatol Odzijewicz ◽  
Martin Schlichenmeier ◽  
...  
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Matter ◽  
Quantum Field ◽  
Curved Spacetime

scholarly journals MICROSCOPIC APPROACH TO THE RICCI DARK ENERGY

2012 ◽  
Vol 21 (06) ◽  
pp. 1250053 ◽  
Author(s):  
BOGUSŁAW BRODA
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Energy ◽  
Quantum Field ◽  
Microscopic Approach ◽  
Ricci Dark Energy ◽  
Matter Fields ◽  
Gravitational Background

A derivation of the Ricci dark energy from quantum field theory of fluctuating "matter" fields in a classical gravitational background is presented. The coupling to the dark energy, the parameter α, is estimated in the framework of our formalism, and qualitatively it appears to be within observational expectations.

scholarly journals Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Tobias Binder ◽  
Burkhard Blobel ◽  
Julia Harz ◽  
Kyohei Mukaida
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Matter ◽  
State Formation ◽  
Bound State ◽  
Higher Order ◽  
Theory Approach ◽  
Quantum Field ◽  
The Impact ◽  
Non Equilibrium

Abstract The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios.

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