Zobrazeno 1 - 10
of 124
pro vyhledávání: '"Irges, Nikos"'
Autor:
Irges, Nikos, Kastrinakis, Stylianos
Publikováno v:
Phys.Rev.D 110 (2024) 4, 045001
We introduce a discrete, graph theoretic approach to conformal field theory correlators. In a certain basis, called the squid basis, the correlator of N scalar operators can be expressed as the determinant of a natural, conformally covariant metric o
Externí odkaz:
http://arxiv.org/abs/2402.08449
Publikováno v:
Eur. Phys. J. C 83, 431 (2023)
Using arguments from holography we propose that the deviation of the cosmological spectral index $n_S$ of scalar fluctuations from unity may be controlled almost entirely by the critical exponent $\eta$ of the $d = 3$ Ising model
Comment: 10 pag
Comment: 10 pag
Externí odkaz:
http://arxiv.org/abs/2209.09939
Publikováno v:
Universe 9 (2023) 10, 434
We consider a real scalar field in de Sitter background and compute its thermal propagators. We propose that in a dS/CFT context, non-trivial thermal effects as seen by an 'out' observer can be encoded in the anomalous dimensions of the $d = 3$ Ising
Externí odkaz:
http://arxiv.org/abs/2209.09938
Autor:
Irges, Nikos, Koutroulis, Fotis
Publikováno v:
Eur. Phys. J. C 81, 187 (2021)
We construct the zero temperature (no compact dimensions) effective action for an SU(2) Yang-Mills theory in five dimensions, with boundary conditions that reduce the symmetry on the four-dimensional boundary located at the origin to a U(1)-complex s
Externí odkaz:
http://arxiv.org/abs/2008.03981
We present a systematic derivation of the form of correlators of N operators in a Conformal Field Theory in d>2 dimensions and the exchange-symmetry constraints that the functions of the dimensionless cross-ratios obey for N>3.
Comment: 9 pages,
Comment: 9 pages,
Externí odkaz:
http://arxiv.org/abs/2001.07171
Autor:
Irges, Nikos, Koutroulis, Fotis
Generalized Effective Field Theory (GEFT) is the non-renormalizable extension of an Effective Field Theory where the Wilson coefficients are endowed by their own, independent scale dependence. Such an effective theory can be constructed by quantizing
Externí odkaz:
http://arxiv.org/abs/1907.07726
Autor:
Irges, Nikos, Koutroulis, Fotis
Publikováno v:
Phys. Rev. D 100, 065004 (2019)
We discuss the role of higher dimensional operators in the spontaneous breaking of internal symmetry and scale invariance, in the context of the Lorentz invariant scalar field theory. Using the $\varepsilon$-expansion we determine phase diagrams and
Externí odkaz:
http://arxiv.org/abs/1905.05506
We review a class of models which generalize the traditional Peccei-Quinn (PQ) axion solution by a St\"uckelberg pseudoscalar. Such axion models represent a significant variant with respect to earlier scenarios where axion fields were associated with
Externí odkaz:
http://arxiv.org/abs/1811.05792
Autor:
Irges, Nikos1 (AUTHOR) akalogirou@mail.ntua.gr, Kalogirou, Antonis1 (AUTHOR), Koutroulis, Fotis2 (AUTHOR) fotis.koutroulis@fuw.edu.pl
Publikováno v:
Universe (2218-1997). Oct2023, Vol. 9 Issue 10, p434. 12p.
Autor:
Irges, Nikos, Koutroulis, Fotis
Publikováno v:
Nucl. Phys. B 937 (2018) 135-195
We initiate the continuum description of a non-perturbative 5d lattice Yang-Mills model with 4d boundaries using the $\varepsilon$-expansion. In its simplest version classically the bulk has an $SU(2)$ gauge symmetry and on the boundary there is an A
Externí odkaz:
http://arxiv.org/abs/1804.06306