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Stephen Hawking repeated his assertion that time travel should be possible.
Quantum Theory allows the energy density to be negative in some places, provided it is positive in others. The reason Quantum Theory can allow the energy density to be negative, is that it is based on the Uncertainty Principle.
Hawking has a lecture online about space and tie warps
Dr. Ron Mallett, professor of physics at University of Connecticut, has been obsessed with building a time travel machine.
After reading H.G. Wells’ novel The Time Machine, Mr. Mallett became focused on one goal: to build a time machine so he could go back in time to see his father again and warn him about his impending heart attack. From that point on, Mr. Mallett embarked on an education and career in physics that would hopefully bring him closer to reaching his goal. Mr. Mallett has developed a time travel theory using light. In layman’s terms — if light can create gravity, and gravity can affect time, then light can affect time. He hopes to prove this theory in the lab by using laser lights and reflective mirrors. The Penn State Electro Optic Center located in Pittsburgh, Pennsylvania is collaborating with Mr. Mallett to test the first part of his theory — the gravitational affect of light.
Gravitational Faraday Effect Produced by a Ring Laser (11 page pdf)
Using the linearized Einstein gravitational field equations and the Maxwell field equations it is shown that the plane of polarization of an electromagnetic wave is rotated by the gravitational field created by the electromagnetic radiation of a ring laser. It is further shown that this gravitational Faraday effect shares many of the properties of the standard electromagnetic Faraday effect. An experimental arrangement is then suggested for the observation of this gravitational Faraday effect induced by the ring laser.
Spike Lee is developing a movie (Time Traveler) based on Richard Mallet which is currently planned be released in 2013
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Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
Known for identifying cutting edge technologies, he is currently a Co-Founder of a startup and fundraiser for high potential early-stage companies. He is the Head of Research for Allocations for deep technology investments and an Angel Investor at Space Angels.
A frequent speaker at corporations, he has been a TEDx speaker, a Singularity University speaker and guest at numerous interviews for radio and podcasts. He is open to public speaking and advising engagements.