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Dark Energy from Violation of Energy Conservation.
TLDR
This Letter investigates two potential sources of energy nonconservation-nonunitary modifications of quantum mechanics and phenomenological models motivated by quantum gravity theories with spacetime discreteness at the Planck scale-and shows that such locally negligible phenomena can nevertheless become relevant at the cosmological scale.
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Dark Energy from Quantum Gravity Discreteness.
TLDR
It is argued that discreteness at the Planck scale might manifest in the form of minute violations of energy-momentum conservation of the matter degrees of freedom when described in terms of (idealized) smooth fields on a smooth spacetime.
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Lorentz invariance and quantum gravity: an additional fine-tuning problem?
TLDR
It is explained that combining known elementary particle interactions with a Planck-scale preferred frame gives rise to Lorentz violation at the percent level, some 20 orders of magnitude higher than earlier estimates, unless the bare parameters of the theory are unnaturally strongly fine tuned.
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On the quantum origin of the seeds of cosmic structure
The current understanding of the quantum origin of cosmic structure is discussed critically. We point out that in the existing treatments a transition from a symmetric quantum state to an…
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Shortcomings in the Understanding of why Cosmological Perturbations Look Classical
There is a persistent state of confusion regarding the account of the quantum origin of the seeds of cosmological structure during inflation. The issue is the transition from the quantum…
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Lorentz Invariance Violation and its Role in Quantum Gravity Phenomenology
The notion that gravitation might lead to a breakdown of standard space-time structure at small distances, and that this might affect the propagation of ordinary particles has led to a program to…
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Alternative approach to the galactic dark matter problem
We discuss scenarios in which the galactic dark matter in spiral galaxies is described by a long range coherent field which settles in a stationary configuration that might account for the features…
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Einstein-Yang-Mills isolated horizons: Phase space, mechanics, hair and conjectures
The concept of "Isolated Horizon" has been recently used to provide a full Hamiltonian treatment of black holes. It has been applied successfully to the cases of {\it non-rotating}, {\it…
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Scalar solitons in a 4-dimensional curved space-time
EXISTE UN TEOREMA CONOCIDO COMO UN TEOREMA DE VIRIAL QUE RESTRINGE LA POSIBLE EXISTENCIA DE ONDAS SOLITARIAS NO TRIVIALES, CON CAMPOS ESCALARES EN UN ESPACIO-TIEMPO PLANO CON 3 O MAS DIMENSIONES…
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On spontaneous scalarization
We study in the physical frame the phenomenon of spontaneous scalarization that occurs in scalar-tensor theories of gravity for compact objects. We discuss the fact that the phenomenon occurs exactly…
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