scholarly journals Causality violation and naked time machines in AdS5

2001 ◽  
Vol 2001 (05) ◽  
pp. 014-014 ◽  
Author(s):  
Marco M Caldarelli ◽  
Dietmar Klemm ◽  
Wafic A Sabra
Keyword(s):  
Causality Violation ◽  
Time Machines

Black holes, wormholes and time machines

2016 ◽  
Vol 186 (7) ◽  
pp. 790-792 ◽  
Author(s):  
Igor D. Novikov
Keyword(s):  
Black Holes ◽  
Time Machines

Time Travel

2020 ◽  
Author(s):  
Nikk Effingham
Keyword(s):  
Decision Theory ◽  
Time Travel ◽  
Special Care ◽  
Time Machines

There are various arguments for the metaphysical impossibility of time travel, e.g. it’s impossible because objects could then be in two places at once, or it’s impossible because some objects could bring about their own existence. This book argues that no such argument is sound and that time travel is metaphysically possible. The main focus is on the Grandfather Paradox: if someone could go back in time, they could (impossibly!) kill their own grandfather before he met their grandmother, thus time travel is impossible. This book argues that, in such a case, the time traveller would have the ability to do the impossible (so they could kill their grandfather) even though those impossibilities will never come about (so they won’t kill their grandfather). The remainder of the book explores the ramifications of this view, discussing issues in probability and decision theory. It ends by laying out the dangers of time travel and why, even though no time machines currently exist, we should pay extra special care to ensure that nothing, no matter how small or microscopic, ever travels in time.

scholarly journals KINKS, ENERGY CONDITIONS AND CLOSED TIMELIKE CURVES

2000 ◽  
Vol 09 (05) ◽  
pp. 531-541 ◽  
Author(s):  
PEDRO F. GONZÁLEZ-DÍAZ
Keyword(s):  
Energy Condition ◽  
Weak Energy Condition ◽  
Energy Conditions ◽  
Closed Timelike Curves ◽  
Causality Violation ◽  
Incoherent Radiation ◽  
Cylindrically Symmetric ◽  
Cylindrically Symmetric Spacetime ◽  
Geodesically Complete ◽  
Symmetric Spacetime

A link between the possibility of extending a geodesically incomplete kinked spacetime to a spacetime which is geodesically complete and the energy conditions is discussed for the case of a cylindrically-symmetric spacetime kink. It is concluded that neither the strong nor the weak energy condition can be satisfied in the four-dimensional example, though the latter condition may survive on the transversal sections of such a spacetime. It is also shown that the matter which propagates quantum-mechanically in a kinked spacetime can always be trapped by closed timelike curves, but signaling connections between that matter and any possible observer can only be made of totally incoherent radiation, so preventing observation of causality violation.

scholarly journals Rotating Squeezed Vacua as Time Machines

2016 ◽  
Vol 07 (03) ◽  
pp. 304-311
Author(s):  
S. Al Saleh ◽  
L. A. Al Asfar ◽  
A. Mahroussah
Keyword(s):  
Time Machines

Time Machines: The Relationship between Technology and Temporality

2021 ◽  
Vol 2021 (1) ◽  
pp. 13838
Author(s):  
Christine Beckman ◽  
Sarah Lebovitz ◽  
Kevin Woojin Lee ◽  
Hila Lifshitz-Assaf ◽  
Melissa Mazmanian ◽  
...  
Keyword(s):  
Time Machines ◽  
The Relationship
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