10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- European Organization for Nuclear ResearchCH2k papers
- National and Kapodistrian University of AthensGR1.9k papers
- Charles UniversityCZ1.9k papers
- Rutherford Appleton LaboratoryGB1.9k papers
- Centre National de la Recherche ScientifiqueFR1.8k papers
- Universidad Autónoma de MadridES1.8k papers
- Boğaziçi UniversityTR1.8k papers
- University of BelgradeRS1.8k papers
- Istituto Nazionale di Fisica Nucleare, Sezione di BolognaIT1.8k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.8k papers
- The Ohio State UniversityUS1.8k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.8k papers
305 papers · 1 filter
Unification of Gravity with Internal Interactions: the SO(2,16) Scheme Revisited
Stelios Stefas, George Zoupanos
The starting point of the present work is the observation that the tangent group of a curved manifold need not have the same dimension as the manifold itself. We use this fact to c…
Unification of Gravities with GUTs
Danai Roumelioti, Stelios Stefas, George Zoupanos
Within the gauge-theoretic approach of gravity, the gauging of an enlarged symmetry of the tangent space in four dimensions allows gravity to be unified with internal interactions.…
Nonconformally Ricci-flat instantons in Conformal Gravity with and without nonlinear matter fields
Cristóbal Corral, Borja Diez, Eleftherios Papantonopoulos
In this work, we study nonconformally Ricci-flat gravitational instantons in four-dimensional Conformal Gravity, both in vacuum and in the presence of nonlinear conformal matter. F…
The thermal backreaction of a scalar field in de Sitter spacetime
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
We argue that a scalar field in de Sitter spacetime should feel explicit thermal effects associated with its curvature. Starting from the Bunch-Davies vacuum and a scalar field wit…
On internal mechanical properties of Electroweak Magnetic Monopoles and their effects on stability
K. Farakos, G. Koutsoumbas, Nick E. Mavromatos +1
By considering properties of the energy-momentum tensor of the electroweak magnetic monopole and its Born-Infeld extension, we attempt to make comments on the stability of these co…
Unification of Conformal and Fuzzy Gravities with Internal Interactions resulting in SO(10) and a Possible Probe through Stochastic Gravitational Wave Background
Gregory Patellis, Danai Roumelioti, Stelios Stefas +1
The unification of conformal and fuzzy gravities with internal interactions is based on the facts that i) the tangent group of a curved manifold and the manifold itself do not nece…
To stealth or not to stealth: Thermodynamics of stealth black holes
Athanasios Bakopoulos, Thanasis Karakasis, Eleftherios Papantonopoulos
Using Euclidean methods we investigate the thermodynamics of stealth black hole solutions, which are solutions that geometrically are indistinguishable from those of general relati…
Thermodynamics of black holes featuring primary scalar hair
Athanasios Bakopoulos, Nikos Chatzifotis, Thanasis Karakasis
In this work, we embark on the thermodynamic investigation concerning a family of primary charged black holes within the context of shift and parity symmetric Beyond Horndeski grav…
Exact black holes in string-inspired Euler-Heisenberg theory
Athanasios Bakopoulos, Thanasis Karakasis, Nick E. Mavromatos +2
We consider higher-order derivative gauge field corrections that arise in the fundamental context of dimensional reduction of String Theory and Lovelock-inspired gravities and obta…
Unification of Gravity and Internal Interactions
Spyros Konitopoulos, Danai Roumelioti, George Zoupanos
In the gauge theoretic approach of gravity, General Relativity is described by gauging the symmetry of the tangent manifold in four dimensions. Usually the dimension of the tangent…
Stealth Ellis Wormholes In Horndeski theories
Athanasios Bakopoulos, Nikos Chatzifotis, Cristian Erices +1
In this work we are revisiting the well studied Ellis wormhole solution in a generalized Horndeski theory motivated from the Kaluza-Klein compactification procedure of the more fun…
On the Ghost Problem of Conformal Gravity
Anamaria Hell, Dieter Lust, George Zoupanos
We study the metric perturbations around the de Sitter and Minkowski backgrounds in Conformal Gravity. We confirm the presence of ghosts in both cases. In the de Sitter case, by ap…
Intertwining noncommutativity with gravity and particle physics
George Manolakos, Pantelis Manousselis, Danai Roumelioti +2
Here we present an overview on the various works, in which many collaborators have contributed, regarding the interesting dipole of noncommutativity and physics. In brief, we prese…
Is Gauge Mediation in the Swampland?
Ioannis Dalianis, Fotis Farakos, Alex Kehagias
We note that the typical gauge mediation of supersymmetry breaking is in tension with the global limit of the festina lente swampland bound. The alternatives are mediation/breaking…
Quasinormal Modes and Love Numbers of Kerr Black Holes from AdS Black Holes
Alex Kehagias, Davide Perrone, Antonio Riotto
We show that the linear perturbations of any spin field in the near-zone limit of the Kerr black hole are identical to those of an AdS black hole which enjoys the same basic pr…
Progress in the numerical studies of the type IIB matrix model
Konstantinos N. Anagnostopoulos, Takehiro Azuma, Kohta Hatakeyama +5
The type IIB matrix model, also known as the IKKT model, has been proposed as a promising candidate for a non-perturbative formulation of superstring theory. Based on this proposal…
Ising Cosmology
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
Using arguments from holography we propose that the deviation of the cosmological spectral index of scalar fluctuations from unity may be controlled almost entirely by the cr…
Thermal effects in Ising Cosmology
Nikos Irges, Antonis Kalogirou, Fotis Koutroulis
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' ob…
Primordial Black Holes and Gravitational Waves in Multi-Axion-Chern-Simons Inflation
Nick E. Mavromatos, Vassilis C. Spanos, Ioanna D. Stamou
We study aspects of inflation and the possibility of enhanced production of primordial black holes (PBHs) and gravitational waves (GWs) in a string-inspired model of two axion fiel…
The continuum limit of the modular discretization of AdS
Minos Axenides, Emmanuel Floratos, Stam Nicolis
According to the holographic picture of 't Hooft and Susskind, the black hole entropy, , is carried by the chaotic microscopic degrees of freedom, that live in the near…
O6-plane backreaction on scale-separated Type IIA AdS vacua
Maxim Emelin, Fotis Farakos, George Tringas
We evaluate the backreaction of O6-planes in scale-separated flux vacua of massive Type IIA. Using the appropriate flux scaling we show that the corrections to the v…
Complex Langevin studies of the emergent space-time in the type IIB matrix model
Kohta Hatakeyama, Konstantinos Anagnostopoulos, Takehiro Azuma +5
The type IIB matrix model has been proposed as a non-perturbative definition of superstring theory since 1996. We study a simplified model that describes the late time behavior of…
Complex Linear Multiplets and Local Supersymmetry Breaking
Fotis Farakos, Alex Kehagias, Nikolaos Liatsos
We study supersymmetry breaking from a complex linear superfield coupled to 4D N=1 supergravity. The theory has two classically decoupled vacua, one supersymmetric and one with bro…
Torsion in string-inspired cosmologies and the universe dark sector
Nick E. Mavromatos
I review several aspects of torsion in string-inspired cosmologies. In particular, I discuss its connection with fundamental, string-model independent, axion fields associated with…