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The origin of Saturn's rings has been debated for decades. Measurements from Voyager and Cassini have suggested that the rings could be as young as ~100 Myr and composed of nearly pure water ice. Several scenarios have been proposed to…

Earth and Planetary Astrophysics · Physics 2026-04-24 Yifei Jiao , Francis Nimmo , Jack Wisdom , Rola Dbouk

The external galactic key factor for developing of massive geochronological boundaries, as well as mass extinctions (ME) is proved based on chronological relationships of the impulses of globally short processes. External galactic key…

Earth and Planetary Astrophysics · Physics 2020-08-04 R. S. Nigmatzyanov

After describing all the contradictions associated with the current Plate Tectonics theory, this paper proposes a model where a single cause can explain all geophysical and geological phenomena. The source of the Earth's activity lies in…

Geophysics · Physics 2016-08-16 André Rousseau

Under the assumption that the cosmological constant vanishes in the true ground state with lowest possible energy density, we argue that the observed small but finite vacuum-like energy density can be explained if we consider a theory with…

General Relativity and Quantum Cosmology · Physics 2007-05-23 Jun'ichi Yokoyama

The evolution of thousands of orbits of Jupiter-family comets and asteroids under the gravitational influence of planets was calculated. Comparison of the results obtained by a symplectic method with those obtained by direct integration…

Astrophysics · Physics 2011-04-12 S. I. Ipatov

According to the Krizek-Somer hypothesis [New Astron. 17, 1 (2012); Grav. Cosmol. 21, 59 (2015)], a biological evolution of the Earth is possible only at certain values of the Hubble parameter, because the increasing luminosity of the Sun…

General Physics · Physics 2025-04-28 Yurii V. Dumin , Eugen S. Savinykh

The fluctuations of the vacuum energy are treated as a non-equilibrium process and a stochastic model for the cosmological constant is presented, which yields a natural explanation for the smallness or zero value of the constant in the…

Astrophysics · Physics 2007-05-23 J. W. Moffat

Motivated by the comments of Goodman (2009) on our paper concerning thermal tides (Arras and Socrates 2009a), we have studied an idealized problem to understand the global response of a completely fluid gas giant planet to thermal forcing…

Earth and Planetary Astrophysics · Physics 2009-12-14 Phil Arras , Aristotle Socrates

In a tidal disruption event (TDE), a star is destroyed by the tidal field of a supermassive black hole. The stellar debris is initially placed on highly elliptical orbits, and a longstanding question in TDE theory is: How does the stellar…

High Energy Astrophysical Phenomena · Physics 2026-05-21 Chris Nixon , Eric R. Coughlin , Zachary L. Andalman

Arising out of an attempt at a new foundations of mathematics, in which relations are more primitive than sets, and out of the theoretical physicists' concept of underlying causes of empirical phenomena, the idea of a purely mathematical…

History and Philosophy of Physics · Physics 2011-11-22 Helier Robinson

A model is proposed to explain temporal patterns of activity in a class of periodically exploding Strombolian-type volcanos. These patterns include major events (explosions) which follow each other every 10-30 minutes and subsequent tremor…

Geophysics · Physics 2007-05-23 A. Ozerov , I. Ispolatov , J. Lees

Properly interpreted data from nearby galaxies $(z\simeq 0.01)$ lead to $\Omega \simeq 0.082$. Data from farther away galaxies $(z\simeq 1)$ with type Ia supernovae to $\Omega =0.153$. Data to be expected from very high redshifted galaxies…

Astrophysics · Physics 2007-05-23 J. A. Gonzalo

We use the most up to date Milky Way model and solar orbit data in order to test the hypothesis that the Sun's galactic spiral arm crossings cause mass extinction events on Earth. To do this, we created a new model of the Milky Way's spiral…

Astrophysics of Galaxies · Physics 2015-06-17 M. D. Filipović , J. Horner , E. J. Crawford , N. F. H. Tothill

The formation of the solar system's giant planets predated the ultimate epoch of massive impacts that concluded the process of terrestrial planet formation. Following their formation, the giant planets' orbits evolved through an episode of…

Earth and Planetary Astrophysics · Physics 2021-06-23 Matthew S. Clement , Nathan A. Kaib , Sean N. Raymond , John E. Chambers

An instability among the giant planets' orbits can match many aspects of the Solar System's current orbital architecture. We explore the possibility that this dynamical instability was triggered by the close passage of a star or substellar…

Earth and Planetary Astrophysics · Physics 2025-12-10 Sean N. Raymond , Nathan A. Kaib

We introduce a new variational method for finding periodic orbits of flows and spatio-temporally periodic solutions of classical field theories, a generalization of the Newton method to a flow in the space of loops. The feasibility of the…

Chaotic Dynamics · Physics 2017-08-23 Predrag Cvitanovic , Yueheng Lan

Formulating the equations of motion for cosmological bodies (such as galaxies) in an integral, rather than differential, form has several advantages. Using an integral the mathematical instability at early times is avoided and the boundary…

Astrophysics · Physics 2009-10-31 Alan B. Whiting

There is a paradox in the standard model of cosmology. How can matter in the early universe have been in thermal equilibrium, indicating maximum entropy, but the initial state also have been low entropy (the "past hypothesis"), so as to…

General Relativity and Quantum Cosmology · Physics 2023-12-21 Jordan Scharnhorst , Anthony Aguirre

The mechanism of continuous set of different universes formation is elaborated. It provides tool to solve the problem of observed smallness of physical parameters. Solution of two puzzles - the hierarchy and the cosmological constant…

General Relativity and Quantum Cosmology · Physics 2015-11-13 Sergey G. Rubin