Dark Energy from graviton-mediated interactions in the QCD vacuum

Journal Article · Sat Jun 01 04:00:00 EDT 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/06/011· OSTI ID:22282901

Pasechnik, Roman ^[1]; Beylin, Vitaly; Vereshkov, Grigory ^[2]

---

1. Department of Astronomy and Theoretical Physics, Lund University, SE-223 62 Lund (Sweden)
2. Research Institute of Physics, Southern Federal University, 344090 Rostov-on-Don (Russian Federation)

Adopting the hypothesis about the exact cancellation of vacuum condensates contributions to the ground state energy in particle physics to the leading order in graviton-mediated interactions, we argue that the observable cosmological constant can be dynamically induced by an uncompensated quantum gravity correction to them after the QCD phase transition epoch. To start with, we demonstrate a possible cancellation of the quark-gluon condensate contribution to the total vacuum energy density of the Universe at temperatures T < 100 MeV without taking into account the graviton-mediated effects. In order to incorporate the latter, we then calculate the leading-order quantum correction to the classical Einstein equations due to metric fluctuations induced by the non-perturbative vacuum fluctuations of the gluon and quark fields in the quasiclassical approximation. It has been demonstrated that such a correction to the vacuum energy density has a form ε{sub Λ} ∼ GΛ{sub QCD}{sup 6}, where G is the gravitational constant, and Λ{sub QCD} is the QCD scale parameter. We analyze capabilities of this approach based on the synthesis between quantum gravity in quasiclassical approximation and theory of non-perturbative QCD vacuum for quantitative explanation of the observed Dark Energy density.

• OSTI ID: 22282901
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 06 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
APPROXIMATIONS
CORRECTIONS
COSMOLOGICAL CONSTANT
COSMOLOGY
EINSTEIN FIELD EQUATIONS
ENERGY DENSITY
FLUCTUATIONS
GLUON CONDENSATION
GLUONS
GROUND STATES
METRICS
MEV RANGE
NONLUMINOUS MATTER
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUANTUM GRAVITY
QUARK MATTER
UNIVERSE