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“Most lovers of science fiction are quick to tell you that there’s a “time-honored” (pun intended) way to build a time machine – somehow get a wormhole and use it as a bridge to travel through time. (It’s even worked in movies such as Thor and Interstellar.)
According to general relativity – this might actually work. However, when it comes to our understanding of the Universe, general relativity may not be the final word. While general relativity does a great job at predicting how macroscopic objects like stars and planets move and interact, it is not a fundamental explanation of the Universe. It doesn’t take into account the very small, weird world of quantum mechanics. According to general relativity, large objects, such as planets, stars or galaxies, interact in a continuous manner. Gravity itself is a continuous force. In quantum mechanics, however, space, matter, energy, interactions… everything… are quantized. That means that there is a grainy-ness in space – that if you zoom up far enough – you should see the “pixels” of space.
To try to understand how general relativity can be united with quantum mechanics, physicists have been attempting to develop a theory of quantum gravity. A successful theory would explain both the very large – planets and clusters of galaxies – and the very small – atoms and quarks. There are several models of quantum gravity that unite the very large with the very small. And a recent paper looks into if time travel is possible in these models of quantum gravity.”
JJ Editor's Picks
"Is the American foreign-policy community wise enough, disciplined enough, and knowledgeable enough about Asia to build an effective coalition to balance a rising China? The example of Myanmar is a worrying one. Myanmar received extraordinary..."
"Last Wednesday, the Trump administration announced its plan to roll back efficiency standards for lightbulbs. This would halt the slow-moving process of phasing out inefficient incandescent and halogen lightbulbs in favor of LEDs, through..."
"Most lovers of science fiction are quick to tell you that there's a "time-honored" (pun intended) way to build a time machine - somehow get a wormhole and use it as a bridge to travel through time. (It's even worked in movies such as Thor and..."
"The Sugerman family’s trip to Southern Utah this past May involved a treacherous drive. There were hairpin turns; the three adult children needed to move boulders to clear a path for the car. “We were on these roads which were barely roads..."
"One of the unloveliest ideas in economics goes by the name “value of a statistical life” — VSL for short. In the U.S. government, the current value of a human life is about $10 million. That means that if a highway safety regulation would save..."
"My friend Molly had her first baby about a month ago. She watched Friends in the hospital during labor. Then she took her baby home, where she watched more Friends—the entire last five seasons, to be exact. I was baffled. Not because I thought..."
"For the first time in its history, Israel is facing a real possibility of government chaos and a deep and unprecedented constitutional crisis. The person behind this crisis is the head of government himself, Prime Minister Benjamin Netanyahu...."
"Major corporations get caught behaving badly … a lot. And so far, the main solution we’ve come up with is fining them — the Federal Trade Commission hit Facebook with a $5 billion fine this summer, an amount that, while large, will barely make a..."