1.4k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Texas A&M UniversityUS282 papers
- Academy of AthensGR204 papers
- European Organization for Nuclear ResearchCH141 papers
- Institute of Theoretical PhysicsCN77 papers
- Chinese Academy of SciencesCN75 papers
- King's College LondonGB60 papers
- Mitchell InstituteUS50 papers
- University of MinnesotaUS41 papers
- Sam Houston State UniversityUS27 papers
- Kavli Institute for Theoretical SciencesCN26 papers
- University of OxfordGB25 papers
- Rice UniversityUS21 papers
17 papers · 1 filter
Constraining D-foam via the 21-cm Line
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
We have suggested earlier that D-particles, which are stringy space-time defects predicted in brane-inspired models of the Universe, might constitute a component of dark matter, an…
A Novel Foamy Origin for Singlet Fermion Masses
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
We show how masses for singlet fermions can be generated by interactions with a D-particle model of space-time foam inspired by brane theory. It has been shown previously by one of…
Comments on Graviton Propagation in Light of GW150914
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
The observation of gravitational waves from the Laser Interferometer Gravitational-Wave Observatory (LIGO) event GW150914 may be used to constrain the possibility of Lorentz violat…
Liouville Cosmology at Zero and Finite Temperatures
J. Ellis, N. E. Mavromatos, M. Westmuckett +1
We discuss cosmology in the context of Liouville strings, characterized by a central-charge deficit Q^2, in which target time is identified with (the world-sheet zero mode of the)…
The String Coupling Accelerates the Expansion of the Universe
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
Generic cosmological models in non-critical string theory have a time-dependent dilaton background at a late epoch. The cosmological deceleration parameter Q_0 is given by the squa…
Brany Liouville Inflation
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
We present a specific model for cosmological inflation driven by the Liouville field in a non-critical supersymmetric string framework, in which the departure from criticality is d…
Space-Time Foam may Violate the Principle of Equivalence
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
The interactions of different particle species with the foamy space-time fluctuations expected in quantum gravity theories may not be universal, in which case different types of en…
Impact of Low-Energy Constraints on Lorentz Violation
J. Ellis, E. Gravanis, N. E. Mavromatos +1
We extend previous analyses of the violation of Lorentz invariance induced in a non-critical string model of quantum space-time foam, discussing the propagation of low-energy parti…
How Large are Dissipative Effects in Non-Critical Liouville String Theory?
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
In the context of non-critical Liouville strings, we clarify why we expect non-quantum-mechanical dissipative effects to be of order E^2/M_P, where E is a typical energy scale of t…
Dynamical Formation of Horizons in Recoiling D Branes
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
A toy calculation of string/D-particle interactions within a world-sheet approach indicates that quantum recoil effects - reflecting the gravitational back-reaction on space-time f…
Gravitational-Recoil Effects on Fermion Propagation in Space-Time Foam
J. Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
Motivated by the possible experimental opportunities to test quantum gravity via its effects on high-energy neutrinos propagating through space-time foam, we discuss how to incorpo…
A Microscopic Recoil Model for Light-Cone Fluctuations in Quantum Gravity
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We present a microscopic model for light-cone fluctuations ``in vacuo'', which incorporates a treatment of quantum-gravitational recoil effects induced by energetic particles. Trea…
Search for Quantum Gravity
John. Ellis, N. E. Mavromatos, D. V. Nanopoulos
A satisfactory theory of quantum gravity may necessitate a drastic modification of our perception of space-time, by giving it a foamy structure at distances comparable to the Planc…
Quantum-Gravitational Diffusion and Stochastic Fluctuations in the Velocity of Light
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We argue that quantum-gravitational fluctuations in the space-time background give the vacuum non-trivial optical properties that include diffusion and consequent uncertainties in…
Time-Dependent Vacuum Energy Induced by D-Particle Recoil
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We consider cosmology in the framework of a `material reference system' of D particles, including the effects of quantum recoil induced by closed-string probe particles. We find a…
Irreversible Time Flow in a Two-Dimensional Dilaton Black Hole with Matter
G. A. Diamandis, John Ellis, B. C. Georgalas +3
We show that an exact solution of two-dimensional dilaton gravity with matter discovered previously exhibits an irreversible temporal flow towards flat space with a vanishing cosmo…
Quantum Decoherence in a Four-Dimensional Black Hole Background
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein-Yang-Mills black hole in four dimensions. This divergence is related to a…