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Gravity follows Newton and Einstein’s rules, even at cosmic scales

Researchers tracked galaxy clusters to test gravity's strength, finding it weakens with distance as predicted by Newton and Einstein. The study confirms the existence of invisible dark matter, closing the door on alternative theories like Modified Newtonian Dynamics.

SourceUniversity of Pennsylvania·JournalPhysical Review Letters·TypeData/statistical analysis·DateApr 15, 2026

A Snapshot of Relativistic Motion: Special relativity made visible

Researchers from Vienna University of Technology successfully reproduced the Terrell-Penrose effect using laser pulses and precision cameras, demonstrating the relativistic length contraction and its impact on perceived rotation. The experiment uses a novel technique inspired by art to recreate the effect in the laboratory.

SourceVienna University of Technology·JournalCommunications Physics·TypeExperimental study·DateMay 5, 2025
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Three time dimensions, one space dimension

Researchers from Warsaw and Oxford propose a new theoretical framework that incorporates three time dimensions and one spatial dimension. This concept allows for the description of phenomena in a world with superluminal observers, which could potentially exist.

SourceUniversity of Warsaw, Faculty of Physics·JournalClassical and Quantum Gravity·DateDec 22, 2022

Completing Einstein’s homework on special relativity in electromagnetism

Researchers at Osaka University have demonstrated the relativistic contraction of an electric field produced by fast-moving charged particles, as predicted by Einstein’s theory. This effect, corresponding to Lorentz transformation of electromagnetic potentials, has been observed using ultrafast electro-optic measurements.

SourceOsaka University·JournalNature Physics·TypeExperimental study·DateOct 20, 2022
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The Universe, where space-time becomes discrete

Physicists have long struggled to reconcile classical physics and quantum mechanics. New research by Stefano Liberati and colleagues proposes a scenario that preserves special relativity while introducing non-local effects. The model suggests space-time becomes granular at tiny scales, allowing for experimental testing of its predictions.

SourceInternational School of Advanced Studies (SISSA)·JournalPhysical Review Letters·DateApr 22, 2016

Smooth or grainy?

A systematic review presents the state of the art in investigating the existence of grains in space-time, which could lead to violations of special relativity. Physicists have devised methods to test these deviations using high-energy astrophysics phenomena.

SourceInternational School of Advanced Studies (SISSA)·JournalClassical and Quantum Gravity·DateDec 20, 2013

Removing complexity layers from the universe's creation

Physicists propose that Einstein's special relativity emerges from a combination of quantum dynamics and gravity. This theory predicts the formation of charge asymmetry between particles and anti-particles at ultra-minute fractions of seconds after the Big Bang, in agreement with recent cosmological observations.

SourceSpringer·JournalThe European Physical Journal C·DateJul 26, 2013
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