Menu
News
All News
Dungeons & Dragons
Level Up: Advanced 5th Edition
Pathfinder
Starfinder
Warhammer
2d20 System
Year Zero Engine
Industry News
Reviews
Dragon Reflections
Columns
Weekly Digests
Weekly News Digest
Freebies, Sales & Bundles
RPG Print News
RPG Crowdfunding News
Game Content
ENterplanetary DimENsions
Mythological Figures
Opinion
Worlds of Design
Peregrine's Next
RPG Evolution
Other Columns
From the Freelancing Frontline
Monster ENcyclopedia
WotC/TSR Alumni Look Back
4 Hours w/RSD (Ryan Dancey)
The Road to 3E (Jonathan Tweet)
Greenwood's Realms (Ed Greenwood)
Drawmij's TSR (Jim Ward)
Community
Forums & Topics
Forum List
Latest Posts
Forum list
*Dungeons & Dragons
Level Up: Advanced 5th Edition
D&D Older Editions
*TTRPGs General
*Pathfinder & Starfinder
EN Publishing
*Geek Talk & Media
Search forums
Chat/Discord
Resources
Wiki
Pages
Latest activity
Media
New media
New comments
Search media
Downloads
Latest reviews
Search resources
EN Publishing
Store
EN5ider
Adventures in ZEITGEIST
Awfully Cheerful Engine
What's OLD is NEW
Judge Dredd & The Worlds Of 2000AD
War of the Burning Sky
Level Up: Advanced 5E
Events & Releases
Upcoming Events
Private Events
Featured Events
Socials!
Twitch
YouTube
Facebook (EN Publishing)
Facebook (EN World)
Twitter
Instagram
TikTok
Podcast
Features
Top 5 RPGs Compiled Charts 2004-Present
Adventure Game Industry Market Research Summary (RPGs) V1.0
Ryan Dancey: Acquiring TSR
Q&A With Gary Gygax
D&D Rules FAQs
TSR, WotC, & Paizo: A Comparative History
D&D Pronunciation Guide
Million Dollar TTRPG Kickstarters
Tabletop RPG Podcast Hall of Fame
Eric Noah's Unofficial D&D 3rd Edition News
D&D in the Mainstream
D&D & RPG History
About Morrus
Log in
Register
What's new
Search
Search
Search titles only
By:
Forums & Topics
Forum List
Latest Posts
Forum list
*Dungeons & Dragons
Level Up: Advanced 5th Edition
D&D Older Editions
*TTRPGs General
*Pathfinder & Starfinder
EN Publishing
*Geek Talk & Media
Search forums
Chat/Discord
Menu
Log in
Register
Install the app
Install
Community
General Tabletop Discussion
*Geek Talk & Media
Travelling through a wormhole in space
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Umbran" data-source="post: 6641344" data-attributes="member: 177"><p>Well for many, the idea of "exotic matter", as in actual *physical* material that you can gather up and manipulate, is a bit far fetched. Those same folks sometimes don't have as much of a problem with invoking quantum effects (like the Casimir effect) that produce the same results without having any odd physical materials around. </p><p></p><p>The point, though, is that Tipler wasn't calling on any such to make his cylinder work. </p><p></p><p></p><p></p><p>Yes. As if we needed Hawking to prove that a light-year long cylinder of neutronium wasn't going to be able to allow anyone to move through time <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p></p><p>You can forbid them by noting that you probably can't get enough neutronium in one place to build the thing without it collapsing into a singularity. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" /></p><p></p><p>As for the commonly held view - that sounds like assuming the conclusion, if you ask me. We don't get to determine whether closed timelike curves should be allowed in a final theory. Either they are possible, or they are not, no matter our desires on the issue.</p><p></p><p></p><p></p><p>Which is why I noted them as "less unstable", as opposed to actually unstable.</p><p></p><p>The Kerr solution is also for a black hole with no beginning or end, not one formed by a collapsing star, in any event. And it isn't like anything other than a super-massive black hole has an event horizon we can cross without being destroyed. Though, admittedly, galactic black holes are likely to be rotating, and may well be charged. So, if someone really wants to check it out, they can just go a few tens of thousands of light years away. </p><p></p><p>Not that the rest of the universe will even know about it, as you don't get to come back and tell us if you reached another universe. The Kerr solution is a one-way trip.</p></blockquote><p></p>
[QUOTE="Umbran, post: 6641344, member: 177"] Well for many, the idea of "exotic matter", as in actual *physical* material that you can gather up and manipulate, is a bit far fetched. Those same folks sometimes don't have as much of a problem with invoking quantum effects (like the Casimir effect) that produce the same results without having any odd physical materials around. The point, though, is that Tipler wasn't calling on any such to make his cylinder work. Yes. As if we needed Hawking to prove that a light-year long cylinder of neutronium wasn't going to be able to allow anyone to move through time :) You can forbid them by noting that you probably can't get enough neutronium in one place to build the thing without it collapsing into a singularity. :P As for the commonly held view - that sounds like assuming the conclusion, if you ask me. We don't get to determine whether closed timelike curves should be allowed in a final theory. Either they are possible, or they are not, no matter our desires on the issue. Which is why I noted them as "less unstable", as opposed to actually unstable. The Kerr solution is also for a black hole with no beginning or end, not one formed by a collapsing star, in any event. And it isn't like anything other than a super-massive black hole has an event horizon we can cross without being destroyed. Though, admittedly, galactic black holes are likely to be rotating, and may well be charged. So, if someone really wants to check it out, they can just go a few tens of thousands of light years away. Not that the rest of the universe will even know about it, as you don't get to come back and tell us if you reached another universe. The Kerr solution is a one-way trip. [/QUOTE]
Insert quotes…
Verification
Post reply
Community
General Tabletop Discussion
*Geek Talk & Media
Travelling through a wormhole in space
Top