This archive file was compiled from an interview conducted at the Googleplex in Mountain View, California, 2013. In the discussion, Amit Singhal, a key figure in the evolution of Google’s search engine, broadly outlined the significant hurdles that stood in the way of achieving one of his long-held dreams — creating a true ‘conversational’ search engine. He also sketched out a vision of how the initial versions of such a system would, and also importantly, would not attempt to assist the individuals that it interacted with.

Though the vision was by design more limited and focused than a system capable of passing the famous Turing test, it nonetheless raised stimulating questions about the future relationships of humans and their ‘artificial’ assistants.

More about Amit Singhal:

Wikipedia:
en.wikipedia.org/wiki/Amit_Singhal

Google Search:
en.wikipedia.org/wiki/Google_Search

This archive file was compiled from an interview conducted at the Googleplex in Mountain View, California, 2013.

As late as the 1980s and the 1990s, the common person seeking stored knowledge would likely be faced with using an 18th century technology — the library index card catalogue — in order to find something on the topic he or she was looking for. Fifteen years later, most people would be able to search, at any time and any place, a collection of information that dwarfed that of any library. And unlike the experience with a library card catalogue, this new technology rarely left the user empty-handed.

Information retrieval had been a core technology of humanity since written language — but as an actual area of research it was so niche that before the 1950s, nobody had bothered to give the field a name. From a superficial perspective, the pioneering work in the area during the 1940s and 50s seemed to suggest it would be monumentally important to the future — but only behind the scenes. Information retrieval was to be the secret tool of the nation at war, or of the elite scientist compiling massive amounts of data. Increasingly however, a visionary group of thinkers dreamed of combining information retrieval and the ‘thinking machine’ to create something which would be far more revolutionary for society.

In the case of Google’s Amit Singhal, it was a childhood encounter with a visionary work that gave him his initial fascination with the dream of the thinking machine — a fascination that would result in his evolution to be one of the individuals who began to transform the dream into a reality. The work that he encountered was not that of a scientific pioneer such as Alan Turing or Marvin Minsky — it was a visionary work of pop culture.

More about Amit Singhal:
en.wikipedia.org/wiki/Amit_Singhal
Google Search:
en.wikipedia.org/wiki/Google_Search

I just watched Looper the movie. It is such a good movie and a great story. But then I’m biased. Anything with Bruce Willis is a great movie. Bruce Willis is getting older, which reminds me so am I!

For those who have not watched Looper I won’t give the story away … Looper is a must watch for science fiction fans. And there were other great movies and episodes about time travel. The three Back to the Future, and the Star Trek episodes, for starters.

That was the good news, and now for the bad news. Time travel is impossible. The mathematics behind time travel is excellent, but the physics is not. In contemporary physics, the mechanism of time travel requires wormholes. You get into a wormhole on one side and you pop out the other side either in the future or in the past, depending on what the wormhole was designed to do.

I did some digging, and found the Polchinski’s billiard ball paradox which is a version of the matricide paradox (travelling back through time before one’s birthday and killing one’s mother, hey what about father?) without the free will component. “A billiard ball sent through a wormhole which sends it back in time. In this scenario, the ball is fired into a wormhole at an angle such that, if it continues along that path, it will exit the wormhole in the past at just the right angle to collide with its earlier self, thereby knocking it off course and preventing it from entering the wormhole in the first place.”

Then Kip Thorne’s students came up another solution “to avoid any inconsistencies, by having the ball emerge from the future at a different angle than the one used to generate the paradox, and deliver its younger self a glancing blow instead of knocking it completely away from the wormhole, a blow which changes its trajectory in just the right way so that it will travel back in time with the angle required to deliver its younger self this glancing blow.”

Add to this second scenario that one collects the older billiard ball in a basket. Of course there are some boundaries driven by conservation of mass and when the wormhole was created, that constraint what is observed. But this then raises some questions. How many balls are there in the basket at the start? How many billiard balls does one observe in the middle of this experiment? Think parallel processing not sequential logic.

And, what can I do?” That is, since cause and effect no longer have a consistent relationship, if the basket fills up with billiard balls before I set off the experiment, can I choose not to set off the experiment?

It is sufficient to stop here to make the case that time travel is not possible.

I’m sure Kip Thorne, his students and many, many others are doing good work to develop theoretical models. I hope these older theoretical wormhole models would evolve to new ‘tunneling’ models that do not allow for inconsistent relationships between cause and effect. And these new ‘tunneling’ models will one day allow us to do interstellar travel using some kind of tunneling technology.

Right now time travel is just too easy to debunk. We are not there, yet.

The next in the Debunking Series.

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Benjamin T Solomon is the author & principal investigator of the 12-year study into the theoretical & technological feasibility of gravitation modification, titled An Introduction to Gravity Modification, to achieve interstellar travel in our lifetimes. For more information visit iSETI LLC, Interstellar Space Exploration Technology Initiative.

Solomon is inviting all serious participants to his LinkedIn Group Interstellar Travel & Gravity Modification.