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After Earth's origin, our host star, the Sun, was shining 20 to 25 percent less brightly than today. Without greenhouse-like conditions to warm the atmosphere, our early planet would have been an ice ball and life may never have evolved.…

Inflation is known to produce both gravitational waves and seed magnetic fields on scales well beyond the size of the horizon. The general relativistic interaction between these two sources at the end of inflation showed a significant…

天体物理学 · 物理学 2009-11-13 Christos G. Tsagas

The LIGO-VIRGO collaboration has detected directly on Earth the gravitational wave signals generated by the collision and the merger of two massive black holes at astronomical distance. This major discovery opens up the way to Gravitational…

科普物理 · 物理学 2017-06-26 Luc Blanchet

It is a fact that the universe lives on a Gravitational Wave Background (GWB), which it may be in the form of extra energy, which is not contained in Einstein's field equations. In \cite{Matos:2021jef}, a new model was developed to explain…

综合物理 · 物理学 2024-04-02 Tonatiuh Matos , Luis A. Escamilla , Maribel Hernández , J. Alberto Vázquez

Gravity plays an important part in the experiments and discoveries of the modern world. But how was it discovered? Surely Newton and Einstein were not the only people to observe it and account for it. It had been a long path before the full…

科普物理 · 物理学 2020-12-01 Arshia Anjum , Sriman Srisa Saran Mishra

"The investigation into the possible effects of cosmic rays on living organisms will also offer great interest." - Victor F. Hess, Nobel Lecture, December 12, 1936 High-energy radiation bursts are commonplace in our Universe. From nearby…

高能天体物理现象 · 物理学 2014-03-06 Dimitra Atri , Adrian L. Melott

The acceleration of the cosmic expansion revealed by supernova observations indicates that the present universe is dominated by repulsive dark energy. It is natural that the coupling between the dark energy and the attractive gravity has to…

宇宙学与河外天体物理 · 物理学 2014-10-07 Ti-Pei Li , Mei Wu

A physicalistic argument can support the idea that cognition is an emergent property driven by dissipation. This argument suggests that cognition arises not from any fiat desire to understand the world, but rather because a certain type of…

综合物理 · 物理学 2024-01-03 Karl Svozil

Civilization produces knowledge, which acts as the driving force of its development. A macro-model of civilization that accounts for the effect of knowledge production on population, energy consumption and environmental conditions is…

物理与社会 · 物理学 2020-02-25 Boris M. Dolgonosov

In this paper we consider a thought experiment involving the effect of gravitation on an ideal scale containing a photon. If the tidal forces inherent to a gravitational field are neglected, then one is led to scenario which seems to bring…

综合物理 · 物理学 2011-09-21 Yves Gaspar , Giovanni Acquaviva

The high value of brane tension has a crucial role in recovering Einstein's general relativity at low energies. In the framework of a recently developed formalism with variable brane tension one can pose the question, whether it was always…

广义相对论与量子宇宙学 · 物理学 2015-05-13 László Á. Gergely

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…

综合物理 · 物理学 2025-04-28 Yurii V. Dumin , Eugen S. Savinykh

Through history, the human being tried to relay its daily tasks to other creatures, which was the main reason behind the rise of civilizations. It started with deploying animals to automate tasks in the field of agriculture(bulls),…

人工智能 · 计算机科学 2012-04-10 Ali Elouafiq

This paper has been withdrawn by the author after further work showed the proposed theoretical approach cannot fit planetary perihelion precession data. As presented, the theory doesn't fit gravitational light deflection by the sun either,…

综合物理 · 物理学 2014-03-28 Steven Kenneth Kauffmann

Since laws of physics exist in nature, their possible relationship to terrestial growth is introduced. By considering the human body as a dynamic system of variable mass (and volume), growing under a gravity field, it is shown how natural…

生物物理 · 物理学 2008-09-01 E. Canessa

The inertial (due to rotation) and gravitational fields of the Earth affect the motion of an elementary particle and its spin dynamics. This influence is not negligible and should be taken into account in high-energy physics experiments.…

广义相对论与量子宇宙学 · 物理学 2016-08-15 Yuri N. Obukhov , Alexander J. Silenko , Oleg V. Teryaev

It is well known that two types of gravitational wave memory exist in general relativity (GR): the linear memory and the non-linear, or Christodoulou memory. These effects, especially the latter, depend on the specific form of Einstein…

广义相对论与量子宇宙学 · 物理学 2016-12-07 Song Ming Du , Atsushi Nishizawa

It was recently demonstrated that the evolution of helical magnetic field in the primordial plasma at temperatures $T\gtrsim10$ MeV is affected by the phenomenon of chiral quantum anomaly in the electroweak model, leading to a possibility…

宇宙学与河外天体物理 · 物理学 2014-09-19 Oleksandr Tomalak , Yuri Shtanov

It is argued that the observed Thermodynamic Arrow of Time must arise from the boundary conditions of the universe. We analyse the consequences of the no boundary proposal, the only reasonably complete set of boundary conditions that has…

广义相对论与量子宇宙学 · 物理学 2009-10-22 S. W. Hawking , R. Laflamme , G. W. Lyons

It is well known that energy fluxes will produce gravitational wave memory. The gravitational wave memory produced by background including cosmic microwave background (CMB), cosmic neutrino background (C$\nu$B), and gravitational wave…

广义相对论与量子宇宙学 · 物理学 2022-11-01 Zhoujian Cao , Xiaokai He , Zhi-Chao Zhao