With few clues to go on, we don't know what it is; we only know of its existence because somehow, the effects of gravity ...

A new theory of quantum gravity, which attempts to unite quantum physics with Einstein's relativity, could help solve the puzzle of the universe's expansion, a theoretical paper suggests.

Nature survey shows that disagreement about the meaning of quantum physics remains strong, even 100 years in. And that’s OK.

Quantum mechanics is simultaneously beautiful and frustrating. Its explanatory power is unmatched. Armed with the machinery of quantum theory, we have unlocked the secrets of atomic power, divined ...

“This revelation was as exciting as it was unexpected, challenging the assumption that quantum theory is inherently ‘demon-proof,’” explained lead researcher Shintaro Minagawa.

In my opinion, such claims fail to take modern physics into account. Quantum theory involves a complex notion of causation, and it can naturally incorporate final conditions.

But nobody is completely satisfied, perhaps because the 20th century’s other pillar of fundamental physics, Einstein’s theory of gravity (general relativity), does not fit in quantum theory ...

Quantum theory’s prominent use of complex numbers — sums of imaginary and real numbers — was disconcerting to its founders, including physicist Erwin Schrödinger.