28 research outputs found
A Possible Solution of the Cosmological Constant Problem based on Minimal Length Uncertainty and GW170817 and PLANCK Observations
We propose the generalized uncertainty principle (GUP) with an additional
term of quadratic momentum motivated by string theory and black hole physics as
a quantum mechanical framework for the minimal length uncertainty at the Planck
scale. We demonstrate that the GUP parameter, , could be best
constrained by the the gravitational waves observations; GW170817 event. Also,
we suggest another proposal based on the modified dispersion relations (MDRs)
in order to calculate the difference between the group velocity of gravitons
and that of photons. We conclude that the upper bound reads . Utilizing features of the UV/IR correspondence and the obvious
similarities between GUP (including non-gravitating and gravitating impacts on
Heisenberg uncertainty principle) and the discrepancy between the theoretical
and the observed cosmological constant (apparently manifesting
gravitational influences on the vacuum energy density), known as {\it
catastrophe of non-gravitating vacuum}, we suggest a possible solution for this
long-standing physical problem, GeV.Comment: 15 pages, submitted to JCA
QCD thermodynamics and magnetization in nonzero magnetic field
In nonzero magnetic field, the magnetic properties and thermodynamics of the
quantum-chromodynamic (QCD) matter is studied in the hadron resonance gas and
the Polyakov linear-sigma models and compared with recent lattice calculations.
Both models are fairly suited to describe the degrees of freedom in the
hadronic phase. The partonic ones are only accessible by the second model. It
is found that the QCD matter has paramagnetic properties, which monotonically
depend on the temperature and are not affected by the hadron-quark
phase-transition. Furthermore, raising the magnetic field strength increases
the thermodynamic quantities, especially in the hadronic phase but reduces the
critical temperature, i.e. inverse magnetic catalysis.Comment: 14 pages, 3 figures accepted for publication in AHE