103 citations · 675 across the 29 of their papers we have counts for
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Infrared (in)sensitivity of relativistic effects in cosmological observable statistics
Ermis Mitsou, Jaiyul Yoo, Matteo Magi
The relativistic effects in cosmological observables contain critical information about the initial conditions and gravity on large scales. Compared to the matter density fluctuati…
Pure Lorentz spin connection theories and uniqueness of General Relativity
Kirill Krasnov, Ermis Mitsou
General Relativity can be reformulated as a diffeomorphism invariant gauge theory of the Lorentz group, with Lagrangian of the type , where is the curvature 2-for…
Deformations of GR, Geometrodynamics and Reality Conditions
Kirill Krasnov, Ermis Mitsou
In four dimensions complexified General Relativity (GR) can be non-trivially deformed: There exists an (infinite-parameter) set of modifications all having the same count of degree…
Cutting out the cosmological middle man: General Relativity in the light-cone coordinates
Ermis Mitsou, Giuseppe Fanizza, Nastassia Grimm +1
Analytical computations in relativistic cosmology can be split into two sets: time evolution relating the initial conditions to the observer's light-cone and light propagation to o…
Spin connection formulations of real Lorentzian General Relativity
Ermis Mitsou
We derive the pure spin connection and constraint-free BF formulations of real four-dimensional Lorentzian vacuum General Relativity. In contrast to the existing complex formulatio…
Apples with Apples comparison of 3+1 conformal numerical relativity schemes
David Daverio, Yves Dirian, Ermis Mitsou
This paper contains a comprehensive comparison catalog of `Apples with Apples' tests for the BSSNOK, CCZ4 and Z4c numerical relativity schemes, with and without constraint damping…
Observed Angles and Geodesic Light-Cone Coordinates
Ermis Mitsou, Fulvio Scaccabarozzi, Giuseppe Fanizza
We discuss the interpretation of the angles in the Geodesic Light-Cone (GLC) coordinates. In particular, we clarify the way in which these angles can be identified with the observe…
A numerical relativity scheme for cosmological simulations
David Daverio, Yves Dirian, Ermis Mitsou
Cosmological simulations involving the fully covariant gravitational dynamics may prove relevant in understanding relativistic/non-linear features and, therefore, in taking better…
Aspects of Infrared Non-local Modifications of General Relativity
Ermis Mitsou
In this thesis we are interested in the problem of dark energy in cosmology. In particular, we consider the possibility that this effect is due to an infrared non-local modificatio…
Stability analysis and future singularity of the model of non-local gravity
Yves Dirian, Ermis Mitsou
We analyse the classical stability of the model proposed by Maggiore and Mancarella, where gravity is modified by a term to produce the late-time accelerat…
Differential form description of the Noether-Lagrange machinery, vielbein/gauge-field analogies and energy-momentum complexes
Ermis Mitsou
We derive the variational principle and Noether's theorem in generally covariant field theory in an explicitly coordinate-independent way by means of the exterior calculus over the…
Gravitational radiation from radial infall of a particle into a Schwarzschild black hole. A numerical study of the spectra, quasi-normal modes and power-law tails
Ermis Mitsou
The computation of the gravitational radiation emitted by a particle falling into a Schwarzschild black hole is a classic problem studied already in the 1970s. Here we present a de…