SciPost Submission Page

Lectures on Faster-than-Light Travel and Time Travel

by Barak Shoshany

Submission summary

As Contributors: Barak Shoshany
Arxiv Link:
Date submitted: 2019-07-10
Submitted by: Shoshany, Barak
Submitted to: SciPost Physics Lecture Notes
Domain(s): Theoretical
Subject area: Gravitation, Cosmology and Astroparticle Physics


These lecture notes were prepared for a 25-hour course for advanced undergraduate students participating in Perimeter Institute's Undergraduate Summer Program. The lectures cover some of what is currently known about the possibility of superluminal travel and time travel within the context of established science, that is, general relativity and quantum field theory. Previous knowledge of general relativity at the level of a standard undergraduate-level introductory course is recommended, but all the relevant material is included for completion and reference. No previous knowledge of quantum field theory, or anything else beyond the standard undergraduate curriculum, is required. Advanced topics in relativity, such as causal structures, the Raychaudhuri equation, and the energy conditions are presented in detail. Once the required background is covered, concepts related to faster-than-light travel and time travel are discussed. After introducing tachyons in special relativity as a warm-up, exotic spacetime geometries in general relativity such as warp drives and wormholes are discussed and analyzed, including their limitations. Time travel paradoxes are also discussed in detail, including some of their proposed resolutions.

Current status:
Editor-in-charge assigned

Submission & Refereeing History

Submission 1907.04178v1 on 10 July 2019

Login to report or comment