17 citations · 64 across the 12 of their papers we have counts for
12 papers
Quasilocal conservation laws in cosmology: a first look
Marius Oltean, Hossein Bazrafshan Moghaddam, Richard J. Epp
Quasilocal definitions of stress-energy-momentum---that is, in the form of boundary densities (in lieu of local volume densities)---have proven generally very useful in formulating…
Energy of cosmological spacetimes and perturbations: a quasilocal approach
Marius Oltean, Hossein Bazrafshan Moghaddam, Richard J. Epp
Quasilocal definitions of stress-energy-momentum -- that is, in the form of boundary densities (rather than local volume densities) -- have proven generally very useful in formulat…
Study of the Relativistic Dynamics of Extreme-Mass-Ratio Inspirals
Marius Oltean
The principal subject of this thesis is the gravitational two-body problem in the extreme-mass-ratio regime---that is, where one mass is significantly smaller than the other---in t…
Motion of localized sources in general relativity: gravitational self-force from quasilocal conservation laws
Marius Oltean, Richard J. Epp, Carlos F. Sopuerta +2
An idealized "test" object in general relativity moves along a geodesic. However, if the object has a finite mass, this will create additional curvature in the spacetime, causing i…
Particle-without-Particle: a practical pseudospectral collocation method for linear partial differential equations with distributional sources
Marius Oltean, Carlos F. Sopuerta, Alessandro D. A. M. Spallicci
Partial differential equations with distributional sources---in particular, involving (derivatives of) delta distributions---have become increasingly ubiquitous in numerous areas o…
Relativistic geoids and time dependence: quasilocal frames versus isochronometric surfaces
Marius Oltean, Richard J. Epp, Paul L. McGrath +1
In a recent paper [D. Philipp, V. Perlick, D. Puetzfeld, E. Hackmann, and C. Lämmerzahl, Phys. Rev. D 95, 104037 (2017)], a definition of a general-relativistic geoid, restricted t…
A frequency-domain implementation of the particle-without-particle approach to EMRIs
Marius Oltean, Carlos F. Sopuerta, Alessandro D. A. M. Spallicci
The gravitational waves emitted by binary systems with extreme mass ratios carry unique astrophysical information expected to be probed by the next generation of gravitational wave…
Entropy theorems in classical mechanics, general relativity, and the gravitational two-body problem
Marius Oltean, Luca Bonetti, Alessandro D. A. M. Spallicci +1
In classical Hamiltonian theories, entropy may be understood either as a statistical property of canonical systems, or as a mechanical property, that is, as a monotonic function of…
Geoids in General Relativity: Geoid Quasilocal Frames
Marius Oltean, Richard J. Epp, Paul L. McGrath +1
We develop, in the context of general relativity, the notion of a geoid -- a surface of constant "gravitational potential". In particular, we show how this idea naturally emerges a…
Cosmological Perturbations in Antigravity
Marius Oltean, Robert Brandenberger
We compute the evolution of cosmological perturbations in a recently proposed Weyl-symmetric theory of two scalar fields with oppositely-signed conformal couplings to Einstein grav…
Gravitational Waves from Preheating in M-flation
Amjad Ashoorioon, Brandon Fung, Robert B. Mann +2
Matrix inflation, or M-flation, is a string theory motivated inflationary model with three scalar field matrices and gauge fields in the adjoint representation of the $\mathbf{U}(N…
Lifshitz Solitons
Robert Mann, Luisa Pegoraro, Marius Oltean
We numerically obtain a class of soliton solutions for Einstein gravity in dimensions coupled to massive abelian gauge fields and with a negative cosmological constant with…