22 papers · ranked by Valyu relevance
Flaminia Giacomini, Esteban Castro-Ruiz, Časlav Brukner
In physics, every observation is made with respect to a frame of reference. Although reference frames are usually not considered as degrees of freedom, in all practical situations it is a physical system which constitutes a reference frame. Can a quantum system be considered as a reference frame and, if so, which…
Matteo Luca Ruggiero
The definition of a reference frame in General Relativity is achieved through the construction of a congruence of time-like world-lines. In this framework, splitting techniques enable us to express physical phenomena in analogy with Special Relativity, thereby realizing the local description in terms of Minkowski…
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This article explores the differences between frame and coordinate transformations in relativistic theories. We highlight the key role of tetrad fields in connecting spacetime and frame indices. Using Maxwell's electrodynamics as an example, we show that Maxwell's equations are invariant under coordinate…
Oleg I. Drivotin
Formal definition of the reference frame is given. This definition is valid for nonrelativistic and relativistic cases. Proposed definition allows using wide classes of reference frames without restriction to inertial, uniformly accelerated or rotating frames. A conception of the system of coordinates associated with a…
Boris Čulina
The concept of inertial frame of reference in classical physics and special theory of relativity is analysed. It has been shown that this fundamental concept of physics is not clear enough. A definition of inertial frame of reference is proposed which expresses its key inherent property. The definition is operational…
Dongcheng He, Haluk Ogmen
Previous studies showed that elongation and symmetry (two ubiquitous aspects of natural stimuli) are important attributes in object perception and recognition, which in turn suggests that these geometrical factors may contribute to the selection of perceptual reference-frames. However, whether and how these attributes…
Subhash Kak
This article revisits the historiography of the problem of inertial frames. Specifically, the case of the twins in the clock paradox is considered to see that some resolutions implicitly assume inertiality for the non-accelerating twin. If inertial frames are explicitly identified by motion with respect to the large…
Mário Bacelar Valente
The 1095 theory of relativity is rightly considered as a breakthrough moment in the history of physics; in particular. it is widely accepted that it brought a new conception of space and time. The purpose of this work is to reevaluate to what point and in what sense can we consider that the conception of space and time…
Yan Chen, Zhe-Xin Xu
Visual search in natural environments involves numerous objects, each composed of countless features. Despite this complexity, our brain efficiently locates targets. Here, we propose that an internal reference frame facilitates real-world visual search. Objects in natural scenes often appear in orientations perceived…
Kenny R. Coventry, Elena Andonova, Thora Tenbrink, Harmen B. Gudde + 1 more
'Paul E. Engelhardt'] To what extent is the choice of what to say driven by seemingly irrelevant cues in the visual world being described? Among such cues, how does prior description affect how we process spatial scenes? When people describe where objects are located their use of spatial language is often associated…
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This article is the second in a two-part tutorial review on electronic spin-dependent dynamics. In Part I, we presented the fundamental theory within the adiabatic Born– Huang framework that describes the interaction between nuclear motion and the elec- tronic (spin and spatial) degrees of freedom. In particular, we…
Jennifer E. Corbett, Marisa Carrasco, Jan Lauwereyns
Performance in most visual discrimination tasks is better along the horizontal than the vertical meridian (Horizontal-Vertical Anisotropy, HVA), and along the lower than the upper vertical meridian (Vertical Meridian Asymmetry, VMA), with intermediate performance at intercardinal locations. As these inhomogeneities are…
Bernard Marius ’t Hart, Patrick Cavanagh
When two probes are flashed at different times within a moving frame they can be perceived as dramatically separated from each other even though they are at the same location in the display. This effect suggests that we perceive object position relative to the surrounding frame even when it is moving (19). Here, 8…
H. G. Solari, M. A. Natiello
We present an epistemological schema of natural sciences inspired by Peirce’s pragmaticist view, stressing the role of the phenomenological map, that connects reality and our ideas about it. The schema has a recognisable mathematical/logical structure which allows to explore some of its consequences. We show that…
Sabyasachi Shivkumar, Gregory C. DeAngelis, Ralf M. Haefner
Since motion can only be defined relative to a reference frame, which reference frame guides perception? A century of psychophysical studies has produced conflicting evidence: retinotopic, egocentric, world-centric, or even object-centric. We introduce a hierarchical Bayesian model mapping retinal velocities to…
Adrienn Réka Németh, Sandra Stojić, Zoltan Nadasdy
In this article, we review the extensive and complex fabric of literature concerning the ontogenesis of spatial representations from earliest childhood to the elderly, including normal and abnormal aging (dementia and Alzheimer’s disease). We also revisit fundamental concepts of the neuronal representations of space…
Patrick Cavanagh, Stuart Anstis, Matteo Lisi, Mark Wexler + 4 more
Probes flashed within a moving frame are dramatically displaced (15; 24) The effect is much larger than that seen on static or moving probes (induced motion, 6; 21). These flashed probes are often perceived with the separation they have in frame coordinates — a 100% effect. Here we explore this frame effect on flashed…
Mert Özkan, Stuart Anstis, Bernard M. ’t Hart, Mark Wexler + 1 more
To capture where things are and what they are doing, the visual system may extract the position and motion of each object relative to its surrounding frame of reference^e.g.,1,2^. Here we report a particularly powerful example where a paradoxical stabilization is produced by a moving frame. We first take a frame that…
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NMR chemical shifts depend on the applied magnetic flux density, and this becomes more and more important as stronger and stronger magnetic fields are becoming available. Herein, we develop a theory of the field dependence of NMR shifts of paramagnetic molecules in solution. Our derivation leads to two distinct…
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Electrochemical techniques have been extensively employed across various fields of research due to their pivotal role in advancing the clean energy transition. This interdisciplinary integration, however, requires special attention to the fundamental aspects of electrochemistry. As the number of researchers adopting…
Umberto Lucia, Giulia Grisolia
Causality is the relationship between causes and effects. Following Relativity, any cause of an event must always be in the past light cone of the event itself, but causes and effect must always be related to some interactions. In this paper, causality is developed as a consequence of the analysis of the Einstein…
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Most advances in electronic spin-dependent non-adiabatic dynamics focus on refining the underlying dynamics methods. In contrast, this work considers an improved description of spin-orbit coupling by explicitly accounting for its relativistic origins. To this end, we extend a standard one-electron triatomic…