A massive object experiencing charge interactions with a surrounding field does encounter viscous force, a question long challenging theoretical physicists. Calculations regarding this phenomenon are now reconciled by refining fundamental laws governing motion, enabling more accurate prediction of forces acting on objects moving through fields relevant to understanding effects like cosmological particle creation and quantum friction experienced by atoms near surfaces. Calculations concerning viscous forces experienced by objects moving through fields have been reconciled, resolving inconsistencies between traditional Newtonian physics and Einstein’s theory of special relativity.

The team investigated whether an object with charged components interacting with a surrounding field encounters a ‘viscous force’, similar to effects seen in cosmology and quantum friction; the work clarifies understanding of ‘vacuum viscosity, a drag arising from fluctuations which may affect both universal expansion and microscopic mechanical systems. Investigations conducted by researchers at National Taiwan University and the University of Maryland determined that an object experiences a ‘viscous force’ when moving through a field, akin to friction but arising not from direct contact, but from interactions with the field itself.

This concept links seemingly disparate phenomena like cosmological particle creation, imagining empty space isn’t truly empty but filled with fleeting particles that can pop into existence under extreme conditions, and quantum friction. This investigation centres on ‘vacuum viscosity, describing how fluctuations within a field might create drag potentially influencing everything from the expansion rate of the universe to the movement of atoms near surfaces. The team adopted a detailed model accounting for interplay between internal charged components, external motion, and the surrounding field; however initial calculations using standard physics conflicted with those incorporating Einstein’s theory of special relativity.

Resolving relativistic viscous force discrepancies through modified Newtonian dynamics

Researchers at College of Electrical Engineering and Computer Science, collaborating with University of Maryland and others, have demonstrated that inconsistencies between nonrelativistic and relativistic calculations concerning viscous forces on massive bodies can be resolved by refining Newton’s laws. Previously, accurate modelling of these interactions while upholding special relativity proved elusive. The team identified flaws within traditional Newtonian frameworks leading to inaccurate predictions about drag-like resistance experienced by objects possessing charged internal degrees of freedom interacting with a surrounding field.

Studies beginning in the 1970s, examining cosmological particle creation and the dynamical Casimir effect, provided groundwork for this development; both phenomena link vacuum viscosity to quantum field fluctuations. A microphysics model frequently used in optomechanics adopted to examine how internal atomic characteristics interact with external mechanical motion alongside classical electromagnetic fields.

Initial nonrelativistic computations predicted viscous force existence, but equivalent relativistic calculations disputed that finding, prompting deeper investigation into underlying assumptions. Pinpointing defects within standard nonrelativistic approaches which incorrectly predicted drag-like resistance allowed Newton’s laws to be enriched, accounting for special relativity and enabling accurate predictions across different frames of reference.

Reconciling relativistic effects with observed forces on atomically structured bodies in motion

Understanding interactions between moving objects and surrounding fields has long been a goal for physicists; inconsistencies emerge when applying both traditional Newtonian physics and Einstein’s theory of special relativity to these scenarios. This research builds upon decades of work exploring cosmological particle creation and the dynamical Casimir effect, phenomena suggesting that seemingly empty space fills with transient particles, while also considering quantum friction experienced by atoms near surfaces. Acknowledging discrepancies between nonrelativistic calculations and those incorporating special relativity regarding force on moving objects remains valuable, as it drives refinement of fundamental physical laws. Current models struggle to accurately represent accelerating atoms due to radiation emitted from their charge distribution, revealing limitations within standard Newtonian mechanics when applied to scenarios involving motion alongside internal atomic structure.

The researchers found that applying principles of special relativity necessitates additions to Newton’s first and second laws of motion when examining atomically structured bodies in movement. This reconciliation addresses inconsistencies arising when attempting to simultaneously account for both relativistic effects and observed forces on these objects. The work clarifies how interactions between an object’s mass, its charged components, and external fields should be understood at different speeds. By identifying defects in nonrelativistic approaches, the study provides a more accurate framework for predicting behaviour across varying frames of reference.

👉 More information
🗞 Vacuum viscosity and relativistic inertia: Motion of a massive object with charged internal degrees of freedom interacting with a classical field
✍️ Jen-Tsung Hsiang and Bei-Lok Hu
🧠 ArXiv: https://arxiv.org/abs/2608.20140

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