Approximately 13.8 billion years ago, the universe began as a singularity, a point of infinite density and temperature. This event, known as the Big Bang, marked the inception of space-time itself.

Why the universe is expanding and what it could mean for earth

Our universe is expanding and the reason for it might be the existence of an anti-universe. This is something similar to what we know in the world of sci-fi as multiverse - the existence of multiple worlds, or two universes in this case. Naman Kumar, a PhD student at the Indian Institute of Technology (IIT), has put&nbsp;forward the theory in the new papers published in Gravitation and Cosmology and Europhysics Letters.

He says that the expansion of the universe is possibly linked to another universe. Kumar looks at the earliest stages of the universe combined with the idea of the quantum phenomenon of matter generation. Based on his premise, he theorises that with every tiny piece of matter created during the Big Bang, a twin piece of anti-matter was also formed. As a result, Kumar says that when our universe was created, an anti-universe also came into existence.

Going by his theory, at the time the universe was created, the anti-universe acted like a twin but one that behaved in an opposite manner to ours. This complex relationship likely resulted in both universes expanding rapidly, he says.

Kumar, in his ScienceX dialogue, says, "After working on the problems of dark matter and dark energy, I can say that either we accept that general relativity is correct and we live in a dark universe with these elusive and peculiar dark matter particles and dark energy, or we accept that we live in a higher dimensional multiverse."

Also Read:&nbsp;<a href="https://www.wionews.com/science/frightening-new-theory-suggests-the-universe-should-have-never-been-born-748613">Universe should have killed itself right after Big Bang, new study suggests</a>

If this is true, then human beings have been living in a multiverse forever without knowing about it. Today, several TV shows and movies dabble with the plot of the multiverse, where different worlds exist parallel to ours.&nbsp;

<h2>Universe should not exist</h2>

Meanwhile, in another such theory, scientists say that the universe shouldn't exist at all, and neither should we. A study challenging several models about the birth of the universe, says that if everything in these models is true, the universe should have been annihilated a long time ago.&nbsp;

This research is based on two premises - primordial black holes and the Higgs boson particle. Higgs field gives everything mass. So if it didn't exist, we wouldn't exist. Experts say if it fell to its lowest point "it would alter the laws of physics dramatically.” If it falls, little “bubbles” of space will form which won't conform to current laws of physics.&nbsp;

When primordial black holes are taken into consideration, things change dramatically. Current models say that these black holes formed in the second right after the Big Bang and evaporated quickly. However, in that tiny span, they would have affected the Higgs field and triggered the creation of tiny bubbles everywhere. Because of this, nothing should have ever formed.&nbsp;

Our universe is expanding and the reason for it might be the existence of an anti-universe. This is something similar to what we know in the world of sci-fi as multiverse - the existence of multiple worlds, or two universes in this case.

Our universe is expanding and the reason for it might be the existence of an anti-universe. This is something similar to what we know in the world of sci-fi as multiverse - the existence of multiple worlds, or two universes in this case. Naman Kumar, a PhD student at the Indian Institute of Technology (IIT), has put forward the theory in the new papers published in Gravitation and Cosmology and Europhysics Letters. He says that the expansion of the universe is possibly linked to another universe. Kumar looks at the earliest stages of the universe combined with the idea of the quantum phenomenon of matter generation. Based on his premise, he theorises that with every tiny piece of matter created during the Big Bang, a twin piece of anti-matter was also formed. As a result, Kumar says that when our universe was created, an anti-universe also came into existence. Going by his theory, at the time the universe was created, the anti-universe acted like a twin but one that behaved in an opposite manner to ours. This complex relationship likely resulted in both universes expanding rapidly, he says. Kumar, in his ScienceX dialogue, says, "After working on the problems of dark matter and dark energy, I can say that either we accept that general relativity is correct and we live in a dark universe with these elusive and peculiar dark matter particles and dark energy, or we accept that we live in a higher dimensional multiverse." Also Read: Universe should have killed itself right after Big Bang, new study suggests If this is true, then human beings have been living in a multiverse forever without knowing about it. Today, several TV shows and movies dabble with the plot of the multiverse, where different worlds exist parallel to ours. Universe should not exist Meanwhile, in another such theory, scientists say that the universe shouldn't exist at all, and neither should we. A study challenging several models about the birth of the universe, says that if everything in these models is true, the universe should have been annihilated a long time ago. This research is based on two premises - primordial black holes and the Higgs boson particle. Higgs field gives everything mass. So if it didn't exist, we wouldn't exist. Experts say if it fell to its lowest point "it would alter the laws of physics dramatically.” If it falls, little “bubbles” of space will form which won't conform to current laws of physics. When primordial black holes are taken into consideration, things change dramatically. Current models say that these black holes formed in the second right after the Big Bang and evaporated quickly. However, in that tiny span, they would have affected the Higgs field and triggered the creation of tiny bubbles everywhere. Because of this, nothing should have ever formed.

Twin universe? Indian student suggests we are living in multiverse

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Why the universe is expanding and what it could mean for earth

Twin universe? Indian student suggests we are living in multiverse