Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Koutroulis, Fotis"'
We propose a setup for the origin of dark matter based on spacetime with a warped extra dimension and three branes: the Planck brane, the TeV brane, at a (few) TeV scale $\rho_T$, and a dark brane, at a (sub)-GeV scale $\rho_1\lesssim 100$ GeV $\ll\r
Externí odkaz:
http://arxiv.org/abs/2403.06276
We consider gravitational production of singlet fermions such as sterile neutrinos during and after inflation. The production efficiency due to classical gravity is suppressed by the fermion mass. Quantum gravitational effects, on the other hand, are
Externí odkaz:
http://arxiv.org/abs/2310.15906
Autor:
Grefsrud, Aurora Singstad, Buanes, Trygve, Koutroulis, Fotis, Lipniacka, Anna, Masełek, Rafał, Papaefstathiou, Andreas, Sakurai, Kazuki, Sjursen, Therese B., Slazyk, Igor
In models with large extra dimensions, "miniature" black holes (BHs) might be produced in high-energy proton-proton collisions at the Large Hadron Collider (LHC). In the semi-classical regime, those BHs thermally decay, giving rise to large-multiplic
Externí odkaz:
http://arxiv.org/abs/2310.15227
We study the vacuum dynamics of pseudo-Nambu-Goldstone bosons (pNGBs) for $SO(N+1) \rightarrow SO(N)$ spontaneous and explicit symmetry breaking. We determine the magnitude of explicit symmetry breaking consistent with an EFT description of the effec
Externí odkaz:
http://arxiv.org/abs/2309.15749
With no evidence of any exotic particle detected so far beyond the Standard Model, the new physics may lie above the presently accessible energies at colliders and, at low-energies, can be accounted for via an effective description. The interplay of
Externí odkaz:
http://arxiv.org/abs/2304.10560
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
Publikováno v:
In Nuclear Physics, Section B September 2023 994