17,499 research outputs found
F-term Stabilization of Odd Axions in LARGE Volume Scenario
In the context of the LARGE volume scenario, stabilization of axionic moduli
is revisited. This includes both even and odd axions with their scalar
potential being generated by F-term contributions via various tree-level and
non-perturbative effects like fluxed E3-brane instantons and fluxed
poly-instantons. In all the cases, we estimate the decay constants and masses
of the axions involved.Comment: 35 pages, 3 figures, version3, Title changed along with significant
changes in the introduction to stress that implementing a 'concrete' visible
sector was not among the goals to achieve in this article, version to appear
in NP
Dimensional oxidation and modular completion of non-geometric type IIB action
Utilizing a setup of type IIB superstring theory compactified on an
orientifold of T^6/(Z2xZ2), we propose a modular invariant dimensional
oxidation of the four-dimensional scalar potential. In the oxidized
ten-dimensional supergravity action, the standard NS-NS and RR three form
fluxes (H-, F-) as well as the non-geometric fluxes (Q-, P-) are found to
nicely rearrange themselves to form generalized flux-combinations. As an
application towards moduli stabilization, using the same S-duality invariant
scalar potential, we examine the recently proposed No-Go theorem (in
arXiv:1409.7075) about creating a mass-hierarchy between universal-axion and
the dilaton relevant for axionic-inflation. Considering a two-field dynamics of
universal axion and dilaton while assuming the other moduli/axions being
stabilized, we find a part of the No-Go arguments to be quite robust even with
the inclusion of non-geometric (Q-, P-) fluxes.Comment: version4: 26 pages, minor changes, published versio
Quantization of Yang-Mills Theories without the Gribov Ambiguity
A gauge condition is presented here to quantize non-Abelian gauge theory on
the manifold , which is free from the
Gribov ambiguity. Perturbative calculations in the new gauge behave like the
axial gauge in ultraviolet region, while infrared behaviours of the
perturbative series are quite nontrivial. The new gauge condition, which reads
, may not satisfy the requirement that
in conventional perturbative calculations. However, such
contradiction is not harmful for gauge theories constructed on the manifold
.Comment: 11page
QCD phase transitions via a refined truncation of Dyson-Schwinger equations
We investigate both the chiral and deconfinement phase transitions of QCD
matter in a refined scheme of Dyson-Schwinger equations, which have been shown
to be successful in giving the meson mass spectrum and matching the interaction
with the results from ab initio computation. We verify the equivalence of the
chiral susceptibility criterion with different definitions for the
susceptibility and confirm that the chiral susceptibility criterion is
efficient to fix not only the chiral phase boundary but also the critical end
point (CEP), especially when one could not have the effective thermodynamical
potential. We propose a generalized Schwinger function criterion for the
confinement. We give the phase diagram of both phase transitions and show that
in the refined scheme the position of the CEP shifts to lower chemical
potential and higher temperature. Based on our calculation and previous results
of the chemical freeze out conditions, we propose that the CEP locates in the
states of the matter generated by the Au--Au collisions with
GeV.Comment: 12 pages, 6 figures, 1 tabl
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