Concept
Negative energy
Publications associées (21)
Heuristic Estimation of the Vacuum Energy Density of the Universe: Part II-Analysis Based on Frequency Domain Electromagnetic Radiation
In Part I of this paper, an inequality satisfied by the vacuum energy density of the universe was derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an electron is accelerated to ...
2024Microgravity induces overconfidence in perceptual decision-making
Davide Scaramuzza, Christian Pfeiffer, Leyla Loued-Khenissi
Does gravity affect decision-making? This question comes into sharp focus as plans for interplanetary human space missions solidify. In the framework of Bayesian brain theories, gravity encapsulates a strong prior, anchoring agents to a reference frame via ...
NATURE PORTFOLIO2023Heuristic Estimation of the Vacuum Energy Density of the Universe: Part I—Analysis Based on Time Domain Electromagnetic Radiation
Marcos Rubinstein, Farhad Rachidi-Haeri
In this paper, an inequality satisfied by the vacuum energy density of the universe is derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an electron is accelerated to a constant ...
2023Positive moments for scattering amplitudes
Riccardo Rattazzi, Francesco Riva, Brando Bellazzini, Marc Riembau Saperas
We find the complete set of conditions satisfied by the forward 2 -> 2 scattering amplitude in unitary and causal theories. These are based on an infinite set of energy dependent quantities (the arcs) which are dispersively expressed as moments of a positi ...
AMER PHYSICAL SOC2021Write Termination circuits for RRAM : A Holistic Approach From Technology to Application Considerations
David Atienza Alonso, Alexandre Sébastien Julien Levisse, Marco Antonio Rios
While Resistive Random Access Memories (RRAM) are perceived nowadays as a promising solution for the future of computing, these technologies suffer from intrinsic variability regarding programming voltage, switching speed and achieved resistance values. Wr ...
IEEE2020A review of modeling the effects of vegetation on large wood recruitment processes in mountain catchments
Paolo Perona, Massimiliano Schwarz
Large wood (LW) is an important element in riparian and mountain ecosystems and influences geomorphic controls, particularly in torrents and mountain rivers. Despite several advantages, LW can also exacerbate flood damage near infrastructure due to logjams ...
2019Geomorphic work by gravity currents with varying initial conditions
Gravity currents are density-driven flows that are able to transport high amounts of sediment and are responsible of great geomorphic changes. Moreover they can have severe repercussions on the environment since they are conveyors of substances, e.g. pollu ...
EPFL2018Emergence of Friedmann Equation of Cosmology of a Flat Universe from the Time-Energy Uncertainty Principle
Friedmann equation of cosmology is based on the field equations of general relativity. Its derivation is straight-forward once the Einstein’s field equations are given and the derivation is independent of quantum mechanics. In this paper, it is shown that ...
2017A novel approach to ion-ion Langevin self-collisions in particle-in-cell modules applied to hybrid MHD codes
In order to have a better closure for magnetohydrodynamic (MHD) equations,
a common approach is to obtain the ion fluid pressure tensor by directly computing the moments of an ion distribution function, obtained by a Particle-in-cell (PIC) solver of the V ...
IOP Publishing2017Transient perturbation growth in time-dependent mixing layers
Cristobal Manuel Arratia Martinez
We investigate numerically the transient linear growth of three-dimensional (3D) perturbations in a homogeneous time-evolving mixing layer in order to identify which perturbations are optimal in terms of their kinetic energy gain over a finite, predetermin ...
Cambridge University Press2013