Can We See a Rotating Gravitational Lens?

Rotating Gravitational Lens ?

It is known that the rotation of a gravitational lens affects properties of images. We consider an inverse problem: If the lens is dark, can we infer its rotation from the observed images? We find that, up to the first order in the gravitational constant G, a rotating lens is not distinguishable from a non-rotating one. The quadrupole contribution to the deflection angle is also calculated for ...

Can We See Gravitational Collapse in (quantum) Gravity Perturbation Theory?

In this paper, by making use of the perturbative expansion around topological field theory we are trying to understand why the standard perturbation theory for General Relativity, which starts with linearized gravity does not see gravitational collapse. We start with investigating classical equations of motion. For zero Immirzi parameter the ambiguity of the standard perturbative expansion is r...

Why Can We See a Local Spread of Chikungunya Virus (CHIKV) Infection?

Can we see Focus

The purpose of this study was to determine whether the visual modality is useful for the perception of prosody. An audiovisual corpus consisting of four focus conditions (subject, verb, object focus and broad focus) was recorded from a male native speaker of French. A preliminary production study showed that there are visible correlates of contrastive focus in French a) increase in lip area and...

[Can we see pain?].

Pain is a highly subjective experience that is difficult to measure objectively due to its varied expression. It is defined as a complex sensory-emotional experience, it is modulated by cognitive factors and involves a broad neural system. Functional neuroimaging has helped to define that neural circuit involved in the perception, modulation and response to painful experience, both in healthy c...