Physics News of the Week: On Fermi Bubbles and Black Holes

| March 10, 2013 | 0 Comments

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1. About the Firewall Paradox of Black Holes (March 6)

Researchers at the University of York have recently published an article, which revealed new insights into the life and death of black holes. Their findings dispel the so-called firewall paradox which shocked the physics community when it was announced in 2012. So what is the firewall paradox?

The hearth of the paradox lies in a very fascinating puzzle — what happens at the even horizon of a black hole? There is a number of different views regarding this issue. Some scientists believe that nothing extraordinary would happen at the event horizon, whereas others claim that a body entering the black hole would be annihilated. Polchinski, Almheiri, Marolf, and Sully share the view that an object falling in a black hole would experience a wall of fire and be incinerated on the spot. So what’s the big deal with all of this? Well the problem is that the “firewall scenario” means that equivalence principle of the general theory of relativity might be wrong. For more info about the firewall paradox check out this great article.

The new article published in Physical Review Letters dispels the problem by resorting to quantum information theory. As professor Braunstein said: “Quantum mechanics shows that entanglement can exist across the event horizon, between particles inside and outside the black hole. But if the entanglement is maximal, the firewall never occurs, and it has long been believed to exist for some types of black holes, taking on exactly this maximum value. More about this approach here.

Black Holes still hide many secrets under their sleeves

2. Fermi Bubbles Might be Explained by Dark Matter ( March  7)

A great effort is put by the scientific community to directly prove the existence of dark matter. One of the best examples of this ever-going effort is a paper by Dan Hooper and Tracy Slater recently posted at arXiv. Their research suggests that a massive outflow of charged particles from the center of the Milky Way galaxy, may be partly due to collisions between dark matter particles that result in their annihilation. To read more about the implications of this paper read the full article here.

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