Search Results - "Magueijo, João"

Cosmological time and the constants of nature by Magueijo, João

“…We propose that cosmological time is effectively the conjugate of the constants of nature. Different definitions of time arise, with the most relevant related…”
Get full text

Mach's principle and dark matter by Magueijo, João

“…In this paper we entertain a Machian setting where local physics is non-locally affected by the whole Universe, taking the liberty to identify the local…”
Get full text

Unimodular proca theory: breaking the U(1) gauge symmetry of unimodular gravity via a mass term by Isichei, Raymond, Magueijo, João

“…We study the Hamiltonian structure of unimodular-like theories, where the cosmological constant (or other supposed constants of nature) are demoted from fixed…”
Get full text

Quantum resolution of the cosmological singularity without new physics by Gielen, Steffen, Magueijo, João

“…Abstract We study a quantum Hot Big Bang in the connection representation, with a matter constant of motion m whose conjugate defines time. Superpositions in m…”
Get full text

Vortices, topology and time by Etkin, Altay, Magueijo, João, Rassouli, Farbod-Sayyed

“…We relate physical time with the topology of magnetic field vortices. We base ourselves on a formulation of unimodular gravity where the cosmological constant…”
Get full text

Speedy sound and cosmic structure by Magueijo, João

“…If the speed of sound were vastly larger in the early Universe, a near scale-invariant spectrum of density fluctuations could have been produced even if the…”
Get full text

Examination of evidence for a preferred axis in the cosmic radiation anisotropy by LAND, Kate, MAGUEIJO, Joao

“…We examine previous claims for a preferred axis at (b,l) approximately (60,-100) in the cosmic radiation anisotropy, by generalizing the concept of multipole…”
Get full text

A Contextual Planck Parameter and the Classical Limit in Quantum Cosmology by Barrow, John D., Magueijo, João

“…We propose that whatever quantity controls the Heisenberg uncertainty relations (for a given complementary pair of observables) it should be identified with an…”
Get full text

Anomalous cosmic-microwave-background polarization and gravitational chirality by Contaldi, Carlo R, Magueijo, João, Smolin, Lee

“…We consider the possibility that gravity breaks parity, with left and right-handed gravitons coupling to matter with a different Newton's constant and show…”
Get full text

A Universe that Does Not Know the Time by Magueijo, João, Smolin, Lee

“…In this paper, we propose that cosmological time is a quantum observable that does not commute with other quantum operators essential for the definition of…”
Get full text

Planck-scale dimensional reduction without a preferred frame by Amelino-Camelia, Giovanni, Arzano, Michele, Gubitosi, Giulia, Magueijo, João

“…Several approaches to quantum gravity suggest that the standard description of spacetime as probed at low-energy, with four dimensions, is replaced in the…”
Get full text

Parity at the Planck scale by Arzano, Michele, Gubitosi, Giulia, Magueijo, João

“…We explore the possibility that well known properties of the parity operator, such as its idempotency and unitarity, might break down at the Planck scale…”
Get full text

Non-Gaussianity in single field models without slow-roll conditions by Noller, Johannes, Magueijo, João

Get full text

The Axis of Evil revisited by Land, Kate, Magueijo, João

“…In light of the three-year data release from the Wilkinson Microwave Anisotropy Probe, we re-examine the evidence for the ‘Axis of Evil’ (AoE). We discover…”
Get full text

Observational constraints on dual intermediate inflation by Barrow, John D., Lagos, Macarena, Magueijo, João

“…We explore the observational implications of models of intermediate inflation driven by modified dispersion relations, specifically those representing the…”
Get full text

Inflationary tensor fluctuations, as viewed by Ashtekar variables and their generalizations by Bethke, Laura, Magueijo, João

Get full text

Thermal fluctuations in loop cosmology by Magueijo, João, Singh, Parampreet

Get full text

Cubic anomalies in the Wilkinson Microwave Anisotropy Probe by Land, Kate, Magueijo, João

“…We perform a frequentist analysis of the bispectrum of the Wilkinson Microwave Anisotropy Probe first-year data. We find clear signal domination up to ℓ≈ 200,…”
Get full text

Comments on “Note on varying speed of light theories” by Magueijo, João, Moffat, John W.

“…In a recent note Ellis criticizes varying speed of light theories on the grounds of a number of foundational issues. His reflections provide us with an…”
Get full text

Chiral vacuum fluctuations in quantum gravity by Magueijo, João, Benincasa, Dionigi M T

“…We examine tensor perturbations around a de Sitter background within the framework of Ashtekar's variables and its cousins parameterized by the Immirzi…”
Get full text