Results 81 to 90 of about 2,756,107 (244)

Einstein, Planck and Vera Rubin: Relevant Encounters Between the Cosmological and the Quantum Worlds

Frontiers in Physics, 2021
In Cosmology and in Fundamental Physics there is a crucial question like: where the elusive substance that we call Dark Matter is hidden in the Universe and what is it made of?
Paolo Salucci, Giampiero Esposito, Gaetano Lambiase, Emmanuele Battista, Emmanuele Battista, Emmanuele Battista, Micol Benetti, Micol Benetti, Donato Bini, Donato Bini, Lumen Boco, Gauri Sharma, Valerio Bozza, Luca Buoninfante, Antonio Capolupo, Salvatore Capozziello, Salvatore Capozziello, Giovanni Covone, Giovanni Covone, Rocco D’Agostino, Rocco D’Agostino, Mariafelicia De Laurentis, Mariafelicia De Laurentis, Ivan De Martino, Ivan De Martino, Giulia De Somma, Giulia De Somma, Elisabetta Di Grezia, Chiara Di Paolo, Lorenzo Fatibene, Viviana Gammaldi, Andrea Geralico, Andrea Geralico, Lorenzo Ingoglia, Andrea Lapi, Giuseppe G. Luciano, Leonardo Mastrototaro, Adele Naddeo, Lara Pantoni, Luciano Petruzziello, Luciano Petruzziello, Ester Piedipalumbo, Ester Piedipalumbo, Silvia Pietroni, Aniello Quaranta, Paolo Rota, Giuseppe Sarracino, Francesco Sorge, Antonio Stabile, Cosimo Stornaiolo, Antonio Tedesco, Riccardo Valdarnini, Stefano Viaggiu, Stefano Viaggiu, Andy A. V. Yunge   +54 more
doaj   +1 more source

The simplicity of physical laws

Noûs, EarlyView.
Abstract Physical laws are strikingly simple, yet there is no a priori reason for them to be so. I propose that nomic realists—Humeans and non‐Humeans—should recognize simplicity as a fundamental epistemic guide for discovering and evaluating candidate physical laws.
Eddy Keming Chen
wiley   +1 more source

Noncommutative Quantum Cosmology [PDF]

Gen.Rel.Grav. 37 (2005) 817-821, 2004
We consider noncommutative quantum cosmology in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.The Noncommutative quantum cosmology is considered in the case of the low-energy string effective theory. Exacts solutions are found and compared with the commutative case.
arxiv   +1 more source

Non-singular bounce scenarios in loop quantum cosmology and the effective field description

, 2014
A non-singular bouncing cosmology is generically obtained in loop quantum cosmology due to non-perturbative quantum gravity effects. A similar picture can be achieved in standard general relativity in the presence of a scalar field with a non-standard ...
Cai, Yi-Fu, Wilson-Ewing, Edward
core   +1 more source

A Wheeler–DeWitt Quantum Approach to the Branch-Cut Gravitation with Ordering Parameters

Universe, 2023
In this contribution to the Festschrift for Prof. Remo Ruffini, we investigate a formulation of quantum gravity using the Hořava–Lifshitz theory of gravity, which is General Relativity augmented by counter-terms to render the theory regularized.
Benno August Ludwig Bodmann, César Augusto Zen Vasconcellos, Peter Otto Hess Bechstedt, José Antonio de Freitas Pacheco, Dimiter Hadjimichef, Moisés Razeira, Gervásio Annes Degrazia   +6 more
doaj   +1 more source

Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond

Advanced Physics Research, Volume 4, Issue 5, May 2025.
Singular electromagnetics/optics studies multidimensional topological defects of electromagnetic fields (also known as optical singularities), including phase and polarization singularities, 3D singularities (e.g., optical skyrmions, merons, hopfions, knots, links, and Möbius strips), and even higher‐dimensional singularities.
Jie Yang, Juanna Jiang, Jiafu Wang, Xuezhi Zheng   +3 more
wiley   +1 more source

On quantizing gravity and geometrizing quantum mechanics

Iranian Journal of Physics Research, 2005
We elaborate on some recent results on a solution of the Hilbert-space problem in minisuperspace quantum cosmology and discuss the consequences of making the (geometry of the) Hilbert space of ordinary nonrelativistic quantum systems time-dependent.
Ali Mostafazadeh
doaj  

Cosmological Dynamics of Interacting Dark Energy and Dark Matter in f(Q)$f(Q)$ Gravity

Fortschritte der Physik, Volume 73, Issue 5, May 2025.
Abstract In this work, the behavior of interacting dark energy (DE) and dark matter (DM) within a model of f(Q)$f(Q)$ gravity is explored, employing the standard framework of dynamical system analysis. The power‐law f(Q)$f(Q)$ model is considered, incorporating two different forms of interacting DE and DM: 3αHρm$3\alpha H\rho _m$ and α3HρmρDE$\frac ...
Gaurav N. Gadbail, Simran Arora, Phongpichit Channuie, P. K. Sahoo   +3 more
wiley   +1 more source

Harrison's interpretation of the cosmological redshift revisited [PDF]

, 2009
Harrison's argument against the interpretation of the cosmological redshift as a Doppler effect is revisited, exaggerated, and discussed. The context, purpose, and limitations of the interpretations of this phenomenon are clarified.
arxiv   +1 more source

General relativity and cosmology [PDF]

International Journal of Modern Physics D Vol. 24, No. 14 (2015) 1530030 (15 pages), 2015
This year marks the hundredth anniversary of Einstein's 1915 landmark paper "Die Feldgleichungen der Gravitation" in which the field equations of general relativity were correctly formulated for the first time, thus rendering general relativity a complete theory.
arxiv   +1 more source