Time travel paradoxes, path integrals, and the many worlds interpretation of quantum mechanics

  title={Time travel paradoxes, path integrals, and the many worlds interpretation of quantum mechanics},
  author={Allen E. Everett},
  journal={Physical Review D},
  • A. Everett
  • Published 25 June 2004
  • Physics
  • Physical Review D
We consider two approaches to evading paradoxes in quantum mechanics with closed timelike curves. In a model similar to Politzer's, assuming pure states and using path integrals, we show that the problems of paradoxes and of unitarity violation are related; preserving unitarity avoids paradoxes by modifying the time evolution so that improbable events become certain. Deutsch has argued, using the density matrix, that paradoxes do not occur in the ``many worlds interpretation.'' We find that in… 
Black hole entropy, the black hole information paradox, and time travel paradoxes from a new perspective
  • R. Allen
  • Physics
    Journal of Modern Optics
  • 2019
ABSTRACT Relatively simple but apparently novel ways are proposed for viewing three related subjects: black hole entropy, the black hole information paradox, and time travel paradoxes. (1) Gibbons
Event Operators and Quantum Gates
Relativistic quantum information (RQI) is an emerging field of research dedicated to investigating quantum information protocols in a relativistic setting. Such models may give us clues about what
Do the laws of physics forbid the operation of time machines?
The verdict on the question of whether it is possible to operate a time machine by manipulating matter and energy so as to manufacture closed timelike curves is that no result of sufficient generality to underwrite a confident “yes” has been proven.
Closed Timelike Curves—Time and Again
Sixty years ago, in 1949, Kurt Gödel published a paper dedicated to Albert Einstein on the occasion of his 70th birthday. Gödel presented a solution of Einstein’s field equations for a rotating,
Physical Constraints on Causality-violating Spacetimes in General Relativity
JANCA, ANDREW JOSEPH. Physical Constraints on Causality-Violating Spacetimes in General Relativity. (Under the direction of Arkady Kheyfets.) The theoretical possibility of global causality violation
The Thermodynamics of Time Travel
The concept of time travel captures the imagination of scientists and nonscientists alike. Though theoretical mathematical treatment of the issue in the realm of physics has offered potential means,
New “bigs” in cosmology
Abstract This paper contains a detailed discussion on new cosmic solutions describing the early and late evolution of a universe that is filled with a kind of dark energy that may or may not satisfy
Dark Energy and Bouncing Universe from $\kappa$-Fields
In this thesis we consider some cosmological implications o f k -fields, which are general scalar fields with non-canonical kinetic terms in the action . Cosmological scenarios with k -essence are
An unwelcome consequence of the Multiverse Thesis
It is argued that the Multiverse Thesis has an unwelcome consequence: that extended objects cannot travel in time, which should give pause for concern.
Synthese An Unwelcome Consequence of the Multiverse Thesis
  • 2010
The Multiverse Thesis is a proposed solution to the Grandfather Paradox. It is popular and well promulgated, found in fiction, philosophy and (most importantly) physics. I first offer a short