25 papers · ranked by Valyu relevance
S. Anand Narayanan
Gravity is a fundamental interaction that permeates throughout our Universe. On Earth, gravity gives weight to physical objects, and has been a constant presence throughout terrestrial biological evolution. Thus, gravity has shaped all biological functions, some examples include the growth of plants (e.g.…
Björn Jörges, Joan López-Moliner
In the future, humans are likely to be exposed to environments with altered gravity conditions, be it only visually (Virtual and Augmented Reality), or visually and bodily (space travel). As visually and bodily perceived gravity as well as an interiorized representation of earth gravity are involved in a series of…
Konstantinos Adamopoulos, Dimitrios Koutsouris, Apostolos Zaravinos, George I. Lambrou + 2 more
'George I. Lambrou' 'Raffaele Saladino' 'Miroslav Oborník'] Gravity constituted the only constant environmental parameter, during the evolutionary period of living matter on Earth. However, whether gravity has affected the evolution of species, and its impact is still ongoing. The topic has not been investigated in…
Konstantinos I. Tsarouchas
In physics there are two masses, the gravitational and inertial, and an open question: what is the relation between these two masses? The answer to that must pass through the explanation of inertia. In the experiments that have been made, it has been shown that the ratio of inertial mass to gravitational mass of an…
Arshia Anjum, Sriman Srisa Saran Mishra
Gravity plays an important part in the experiments and discoveries of the modern world. But how was it discovered? Surely Newton and Einstein were not the only people to observe it and account for it. It had been a long path before the full theory for Gravitation could be formulated with open ends for more add-ons and…
Björn Jörges, Lena Slupinski, Joan López-Moliner
Evidence suggests that humans rely on an earth gravity prior for sensory-motor tasks like catching or reaching. Even under earth-discrepant conditions, this prior biases perception and action towards assuming a gravitational downwards acceleration of 9.81 m/s^2^. This can be particularly detrimental in interactions…
R. Aldrovandi, J. G. Pereira
At the time it celebrates one century of existence, general relativity — Einstein's theory for gravitation — is given a companion theory: the so-called teleparallel gravity, or teleparallelism for short. This new theory is fully equivalent to general relativity in what concerns physical results, but is deeply different…
Stéphane Fay
This paper explains the basic principles that lead from Galilean to General Relativity in a simple and concise way to make them understandable in a few pages, even for students or general audience with little knowledge in physics and mathematics. To do so, we do not use any calculation (other than the Pythagorean…
John Z. Kiss, Chris Wolverton, Sarah E. Wyatt, Karl H. Hasenstein + 1 more
'Jack J.W.A. van Loon'] Life on Earth has evolved under the influence of gravity. This force has played an important role in shaping development and morphology from the molecular level to the whole organism. Although aquatic life experiences reduced gravity effects, land plants have evolved under a 1-g environment.…
Francesco Lacquaniti, Gianfranco Bosco, Silvio Gravano, Iole Indovina + 3 more
'Iole Indovina' 'Barbara La Scaleia' 'Vincenzo Maffei' 'Myrka Zago'] Gravity is crucial for spatial perception, postural equilibrium, and movement generation. The vestibular apparatus is the main sensory system involved in monitoring gravity. Hair cells in the vestibular maculae respond to gravitoinertial forces, but…
Dorian Verdel, Simon Bastide, Franck Geffard, Olivier Bruneau + 2 more
Gravity is a ubiquitous component of our environment that we learnt to optimally integrate in movement control. Yet, altered gravity conditions arise in numerous applications from space exploration to rehabilitation, thereby pressing the sensorimotor system to adapt. Here, we used a robotic exoskeleton to test whether…
Caroline Ackley, Neda Ziaei Kajbaf, Lindsey Washiashi, Ruchira Krishnamurthy + 2 more
The ability to sense Earth’s gravitational pull is essential for orientation, navigation, and proprioception in most organisms. Here, we demonstrate that C. elegans adults and dauers exhibit negative gravitaxis and that this behavior is modulated by other environmental inputs such as light and electromagnetic fields.…
Björn Jörges, Marlene Wessels, Heiko Hecht, Laurence R. Harris
Humans have been shown to use an internalized representation or prior of Earth gravity to predict object motion. Often, this is shown using the fact that humans tend to neglect an object’s acceleration when predicting it’s motion. This bias tends to be ameliorated when the acceleration acting on the object is Earth…
H. Pietschmann
Aristotle has split physics at the sphere of the moon; above this sphere there is no change except eternal spherical motion, below are two different kinds of motion: Natural motion (without specific cause) and enforced motion. In modern view motion is caused by gravity and by other forces. The split at the sphere of…
Morfoisse Theo, Herrera Altamira Gabriela, Angelini Leonardo, Clément Gilles + 3 more
Human 3D perception of visual objects is flawed by distortions, which are influenced by non-visual factors, such as gravitational vestibular signals. Whether gravity acts specifically on the visual system or at a higher, modality-independent, level of information processing remains unknown. To test these…
Steve Thorne
All living organisms are gravitationally bound to earth’s surface and spun through three major gravitational potentials at nearly Mach 88. Along this pathway, organisms are subjected to non-isotropic strains that are repetitive in their geometry and their periodicity. Because of the relative smallness of this bias and…
Mohsen Farshad
Information and force definition has been intertwined with the concept of entropy for many years. The information for displacement of degrees of freedom with Brownian motions at a given temperature in space emerges as an entropic force between species. Here, we use this concept of entropy to understand the underlying…
Björn Jörges, Joan López-Moliner
TThere is evidence that humans rely on an earth gravity (9.81 m/s^2^) prior for a series of tasks involving perception and action, the reason being that gravity helps predict future positions of moving objects. Eye-movements in turn are partially guided by predictions about observed motion. Thus, the question arises…
Harvey R. Brown, James Read
We discuss what we take to be three possible misconceptions in the foundations of general relativity, relating to: (a) the interpretation of the weak equivalence principle and the relationship between gravity and inertia; (b) the connection between gravitational redshift results and spacetime curvature; and (c) the…
J A M Pereira
Newtonian gravity can be regarded as a hypothetic - deductive system where the inverse square law is the starting point from which gravitational phenomena are deduced. This operational form of presenting gravity endorses problem solving and seems to be predominant in the teaching practice. In contrast, regarding…
Anderson Alves Tomaz, Rafael Souza Mattos, Mario Barbatti
The Diósi-Penrose model states that the wave-function collapse ending a quantum superposition occurs due to the instability of coexisting gravitational potentials created by distinct geometric conformations of the system in different states. The Heisenberg time-energy principle can be invoked to estimate the collapse…
Dave Dunstan
A relativistic classical particle model of the H-atom is presented. The balance of the electrostatic field and the spacetime field generates a quantized atom of singular radius. The radius is quantized due to the quantized nature of the electric charge. A particle model for the atom yields a quantized electron orbital…
Dave Dunstan
A relativistic classical particle model of the H-atom is presented. The balance of the electrostatic field and the spacetime field generates a quantized atom of singular radius. The radius is quantized due to the quantized nature of the electric charge. A particle model for the atom yields a quantized electron orbital…
Authors not listed
In this second part, we present the explicit analytical expression of the framework introduced in Part I. The formulation yields closed-form predictions for capillary rise and depression in cylindrical geometries and extends naturally to a wide range of configurations. It shows that the contact angle, rather than being…
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…