Quantum gravity articles
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New work reveals the 'quantumness' of gravity
Gravity is part of our everyday life. Still, the gravitational force remains mysterious: to this day we do not understand whether its ultimate nature is geometrical, as Einstein envisaged, or governed by the laws of quantum mechanics.
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The end of the quantum tunnel: Exact instanton transseries for quantum mechanics
In the quantum world, processes can be separated into two distinct classes. One class, that of the so-called "perturbative" phenomena, is relatively easy to detect, both in an experiment and in a mathematical computation. Examples are plentiful: the light that atoms emit, the energy that solar cells produce, the states of qubits in a quantum computer.
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GDEM: Mission of Gravity
If space is infused with ‘dark energy,’ as seems to be the case, we have an explanation for the continuing acceleration of the universe’s expansion. Or to speak more accurately, we have a value we can plug into the universe to make this acceleration happen. Exactly what causes that value remains up for grabs, and indeed frustrates current cosmology, for something close to 70 percent of the total mass-energy of the universe needs to be comprised of dark energy to make all this work. Add on the...