Results 1 to 10 of about 28,955 (308)

Precision early universe cosmology from stochastic gravitational waves [PDF]

Journal of High Energy Physics, 2022
The causal tail of stochastic gravitational waves can be used to probe the energy density in free streaming relativistic species as well as measure g * (T) and beta functions β(T) as a function of temperature.
Dawid Brzeminski, Anson Hook, Gustavo Marques-Tavares   +2 more
doaj   +2 more sources

Axions in the early universe

SciPost Physics Proceedings, 2023
The Peccei-Quinn solution to the strong CP problem provides a motivated framework rich in cosmological consequence. Thermal axion production is unavoidable if there is a thermal bath at early times.
Francesco D'Eramo
doaj   +4 more sources

A small and vigorous black hole in the early Universe. [PDF]

Nature
Maiolino R, Scholtz J, Witstok J, Carniani S, D'Eugenio F, de Graaff A, Übler H, Tacchella S, Curtis-Lake E, Arribas S, Bunker A, Charlot S, Chevallard J, Curti M, Looser TJ, Maseda MV, Rawle TD, Rodríguez Del Pino B, Willott CJ, Egami E, Eisenstein DJ, Hainline KN, Robertson B, Williams CC, Willmer CNA, Baker WM, Boyett K, DeCoursey C, Fabian AC, Helton JM, Ji Z, Jones GC, Kumari N, Laporte N, Nelson EJ, Perna M, Sandles L, Shivaei I, Sun F.   +38 more
europepmc   +2 more sources

Vacuum stability in the early universe and the backreaction of classical gravity. [PDF]

Philos Trans A Math Phys Eng Sci, 2018
Markkanen T.
europepmc   +2 more sources

Curvature Invariants for the Alcubierre and Natário Warp Drives

Universe, 2021
A process for using curvature invariants is applied to evaluate the metrics for the Alcubierre and the Natário warp drives at a constant velocity. Curvature invariants are independent of coordinate bases, so plotting these invariants will be free of ...
Brandon Mattingly, Abinash Kar, Matthew Gorban, William Julius, Cooper K. Watson, MD Ali, Andrew Baas, Caleb Elmore, Jeffrey S. Lee, Bahram Shakerin, Eric W. Davis, Gerald B. Cleaver   +11 more
doaj   +1 more source

Chiral gravitational effect in time-dependent backgrounds

Journal of High Energy Physics, 2021
Gravitational counterpart of the chiral magnetic effect, which is referred as the chiral gravitational effect, can also be of interest in a cosmological setup.
Kohei Kamada, Jun’ya Kume, Yusuke Yamada   +2 more
doaj   +1 more source

The Asymmetric Dynamical Casimir Effect

Physics, 2023
A mirror with time-dependent boundary conditions will interact with the quantum vacuum to produce real particles via a phenomenon called the dynamical Casimir effect (DCE).
Matthew J. Gorban, William D. Julius, Patrick M. Brown, Jacob A. Matulevich, Gerald B. Cleaver   +4 more
doaj   +1 more source

Curvature Invariants for Lorentzian Traversable Wormholes

Universe, 2020
The curvature invariants of three Lorentzian wormholes are calculated and plotted in this paper. The plots may be inspected for discontinuities to analyze the traversability of a wormhole.
Brandon Mattingly, Abinash Kar, William Julius, Matthew Gorban, Cooper Watson, MD Ali, Andrew Baas, Caleb Elmore, Bahram Shakerin, Eric Davis, Gerald Cleaver   +10 more
doaj   +1 more source

Curvature Invariants for the Accelerating Natário Warp Drive

Particles, 2020
A process for using curvature invariants is applied to evaluate the accelerating Natário warp drive. Curvature invariants are independent of coordinate bases and plotting the invariants is free of coordinate mapping distortions.
Brandon Mattingly, Abinash Kar, Matthew Gorban, William Julius, Cooper K. Watson, M.D. Ali, Andrew Baas, Caleb Elmore, Jeffrey S. Lee, Bahram Shakerin, Eric W. Davis, Gerald B. Cleaver   +11 more
doaj   +1 more source

Molecules in the early universe [PDF]

Kinematics and Physics of Celestial Bodies, 2017
12 pages, 1 figure, 3 ...
Novosyadlyj, B., Sergijenko, O., Shulga, V. M.   +2 more
openaire   +2 more sources