By Adam Ross Solomon (auth.)
This paintings investigates the theoretical and cosmological implications of editing Einstein's concept of basic relativity. It explores sessions of differences to gravity: these during which the graviton is given a small mass, and people during which Lorentz invariance is spontaneously damaged. It elucidates the character of cosmological perturbations in theories of huge bimetric gravity, together with a probably lethal instability. Theories of gravity past basic relativity may well clarify why the growth of the Universe is accelerating, obviating the necessity for a dismal power, and will additionally have an effect on the evolution of the early Universe. subsequent, it investigates the character of spacetime in substantial gravity theories that include varied spacetime metrics. finally, the most powerful constraints up to now are put on the dimensions of Lorentz-violating results within the gravity area in the course of inflation.
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Extra resources for Cosmology Beyond Einstein
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7) The Stückelberg “Trick” Before moving on to higher orders in h μν , let us take a moment to count and classify the degrees of freedom it contains at linear order. Recall that a massless graviton contains two polarisations. Because we lose diffeomorphism invariance when we give the graviton a mass, it will contain more degrees of freedom. In fact, there are five in total. In principle, a sixth mode can arise, but it is always ghost-like and must therefore be removed from any healthy theory of massive gravity.
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Cosmology Beyond Einstein by Adam Ross Solomon (auth.)