How Can Astronauts Tell How Fast They’re Going?

Weirdly, spaceships have no direct way to gauge their own speed. Luckily, we can use some physics tricks to figure it out.
Scientific Research Publishing

Non-Invariant One-Way Speed of Light: Advancing the Selleri Transformations ()

In a recent paper [1], the author shows that in spacetime physics, the Selleri transformations (STs) are viable alternatives ...

Light can travel for billions of years yet experience no time

A photon emitted from a star a billion light-years away arrives at a telescope having experienced no time whatsoever. Not ...
IEEE

Quantifying error sources that affect long-term accuracy of Doppler velocity logs

Abstract: A Doppler velocity log measures relative velocity between an instrument and the bottom of a body of water by transmitting acoustic pulses that are scattered off the bottom. The scattered ...
IEEE

Bayesian Seismic Tomography Based on Velocity-Space Stein Variational Gradient Descent for Physics-Informed Neural Network

Abstract: In this study, we propose a Bayesian seismic tomography inference method using physics-informed neural networks (PINNs). PINN represents a recent advance in deep learning, offering the ...