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10 papers · 2 filters
Cosmological constant is a conserved charge
Dmitry Chernyavsky, Kamal Hajian
Cosmological constant can always be considered as the on-shell value of a top form in gravitational theories. The top form is field strength of a gauge field, and the theory enjoys…
Anisotropic Gravitational Collapse and Cosmic Jets
Donato Bini, Carmen Chicone, Bahram Mashhoon
Consider a dynamic general relativistic spacetime in which the proper infinitesimal interval along one spatial coordinate direction decreases monotonically with time, while the cor…
Quantum theory of electromagnetic fields in a cosmological quantum spacetime
Jerzy Lewandowski, Mohammad Nouri-Zonoz, Ali Parvizi +1
The theory of quantum fields propagating on an isotropic cosmological quantum spacetime is reexamined by generalizing the scalar test field to an electromagnetic (EM) vector field.…
Bubble nucleation and inflationary perturbations
Hassan Firouzjahi, Sadra Jazayeri, Asieh Karami +1
In this work we study the imprints of bubble nucleation on primordial inflationary perturbations. We assume that the bubble is formed via the tunneling of a spectator field from th…
More on the holographic Ricci dark energy model: smoothing Rips through interaction effects?
Mariam Bouhmadi-López, Ahmed Errahmani, Taoufik Ouali +1
The background cosmological dynamics of the late Universe is analysed on the framework of a dark energy model described by an holographic Ricci dark energy component. Several kind…
Measuring the effects of Loop Quantum Cosmology in the CMB data
Spyros Basilakos, Vahid Kamali, Ahmad Mehrabi
In this Essay we investigate the observational signatures of Loop Quantum Cosmology (LQC) in the CMB data. First, we concentrate on the dynamics of LQC and we provide the basic cos…