relativity

Despite dozens of experiments over the years, scientists still don't have a precise measurement for gravity's strength. Why is that?

I had a look at a number of books that deal with Special Relativity. Many, if not most, textbooks on the theory of Special Relativity introduce the Lorentz factor ##\gamma## $$\gamma=\frac{1}{\sqrt{1-\frac{v^2}{c^2}}}$$ Different textbooks introduce ##\gamma## differently; some use it only as a... Read more

Hello, I am an independent researcher working on a geometric framework for theoretical physics, based on the Berry connection on an information manifold. The framework derives from the single-electron double-slit experiment. I am here to share my results and welcome technical feedback. I may... Read more

Dispersion of Space: A Volumetric Density Gradient as an Alternative to Spacetime Curvature Author: Lloyd Small Abstract General Relativity describes gravity as the curvature of spacetime caused by mass and energy. This paper proposes an alternative framework in which gravity arises from the... Read more

I am not a physicist. In the block universe model how does causality work? If all timeframes are equal. Surely the cause has to come before the effect and so on therefore causing a string of ...

Physicists have been trying to reconcile the differences between Einstein’s theory of spacetime and our observations of quantum mechanics for almost a century. One way that they’ve attempted to do this involves theories that treat space as one-dimensional at very short distances. In a recent paper, physicists claim that they’ve solved a major problem that’s plagued these theories for decades.

Lets suppose we could place a long rod in orbit, at the distance of Moon. Which would be the stabile position of the rod, perdendicular to the orbital path, or parallel to it? I think parallel, to minimize tidal forces between the two opposite parts of the rod.

My name is Terry David Silvercloud. I go by BUTCH or BUTCH HIMSELF. I am proposing that the cause of the speed of light is the physical size of the electron, both its diameter AND circumference (half spin). Line up Electrons, side by each, in a row, about 10 to the 24th power and you will... Read more

Albert Einstein in 1905 led the constitutional overhaul of fundamental physics. Since then, when Special Relativity (SR) was written in stone, it became established that nothing can move faster than the speed of light in the vacuum: 299.792.458 m/s. This constituent principle is... Read more

I have been reading about the "river model" of general relativity, in which spacetime is described as flowing into a massive object. I am not sure whether this is a fully accurate picture or ...

In holographic theories, physicists may have traced the pliability of space-time to its quantum roots: a measure of quantumness known as “magic.” The post Entanglement Builds Space-Time. Now “Magic” Gives It Gravity. first appeared on Quanta Magazine

Say there is a beam of light at 1 um (f=300 THz), and there is a particle traveling at constant speed along the axis of the beam, which is, say, a few mm or cm in diameter. Say the particle is going fast enough so that the shift brings the light down to the MHz level (v/c ~ 1- O(10^-16)). Then... Read more

This paper develops a non-dual ontological reinterpretation of gravity within the One Source framework. We argue that gravitational phenomena are not fundamental forces nor merely the passive curvature of spacetime, but rather the geometric expression of the Primordial Ground’s reabsorption dynamic. Mass-energy is understood as localized radiation of distinctions from this non-dual source, while …

In quantum field theory a conformal anomaly is a quantum anomaly that breaks conformal invariance. Discussion of the conformal anomaly (Weyl anomaly) of the relativistic string as an anomalous action functional is in (Freed 86, 2.). The following summary of this is taken from this MO answer by Pavel Safronov. Let be a compact surface (worldsheet) and a Riemannian manifold (spacetime). The string …

Foucault’s pendulum experiment led to an increase in the public’s interest in both real-life science and science fiction.

Hey everyone, undergrad here. Just took my first SR course and something's been bugging me. I know this is probably a dumb question, but I'd really appreciate it if someone could point out where my logic breaks. Step 1 – What SR says (as I understand it): For a... Read more

Hi everyone, My name is Miguel Andrés Burgos Arias. I am a high school student from Colombia with a deep interest in theoretical astrophysics, quantum mechanics, and relativity. I found Physics Forums via Google search while looking for a serious community to discuss and stress-test some... Read more

A new theoretical study suggests that black holes may never completely disappear, potentially offering a way to resolve the long-standing black hole information paradox. One of the biggest unsolved problems in modern physics, known as the “black hole information paradox,” may finally have a compelling solution. The proposed answer could also help explain where the [...]

General relativity is conventionally understood as a geometric theory of spacetime curvature sourced by matter-energy. This paper proposes an alternative interpretation grounded in the contological framework (C1–C5) and its mathematical topology companion. We show that: (1) special relativity emerges at the boundary between C2 (space as lattice) and C3 (matter as braids), with the invariant speed…

This paper examines a methodological question arising in orbital mechanics and the foundations of physical modeling: does successful prediction of a relativistic observable uniquely determine the underlying dynamics? Using Mercury perihelion precession as a representative case, several dynamically non-equivalent orbital systems are constructed that reproduce essentially identical relativistic-sca…