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Physics (from the Greek, φύσις (phúsis), "nature" and φυσικός (phusikós), "natural"), the most fundamental physical science, is concerned with the basic principles of the Universe. Consequently, physics deals empirically with the dynamics of matter in the cosmos.
Introduction
Discoveries in physics find applications throughout the other natural sciences as they regard the fundamental constituents of the natural world. Some of the phenomena studied in physics, such as the phenomenon of conservation of energy, are common to all material systems. These are often referred to as laws of physics. Others, such as superconductivity, stem from these laws, but are not laws themselves because they only appear in some systems. Physics is often said to be the "fundamental science" (chemistry is sometimes included), because each of the other weaker sciences (biology, chemistry, geology, material science, engineering, medicine etc.) deals with particular types of material systems that obey the laws of physics. For example, chemistry is the science of matter (such as atoms and molecules) and the chemical substances that they form in the bulk. The structure, reactivity, and properties of a chemical compound are determined by the properties of the underlying molecules, which can be described by areas of physics such as quantum mechanics (called in this case quantum chemistry), thermodynamics, and electromagnetism.
Physics is closely related to mathematics, which provides the logical framework in which physical laws can be precisely formulated and their predictions quantified. Physical definitions, models and theories are invariably expressed using mathematical relations. A key difference between physics and mathematics is that because physics is ultimately concerned with descriptions of the material world, it tests its theories by observations (called experiments), whereas mathematics is concerned with abstract logical patterns not limited by those observed in the real world (because the real world is limited in the number of dimensions and in many other ways it does not have to correspond to richer mathematical structures). The distinction, however, is not always clear-cut. There is a large area of research intermediate between physics and mathematics, known as mathematical physics.
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Feynman path integrals for the inverse quartic oscillator
S. Mazzucchi The Feynman path integral representation for the weak solution of the Schrodinger equation with an inverse quartic oscillator potential is given in terms of a well defined infinite dimensional oscillatory integral. An analytically continued Wiener integral representation for the solution is provided ... [J. Math. Phys. 49, 093502 (2008)] published Thu Sep 4, 2008.
The transmission property of the discrete Heisenberg ferromagnetic spin chain
Qing Ding and Wei Lin We present a mechanism for displaying the transmission property of the discrete Heisenberg ferromagnetic (DHF) spin chain via a geometric approach. With the aid of a discrete nonlinear Schrodinger-like equation which is the discrete gauge equivalent to the DHF, we show that the determination of tran ... [J. Math. Phys. 49, 093501 (2008)] published Thu Sep 4, 2008.
The flip-over effect in self-similar laser-induced plasma expansion
Nathan P. Baxter and Sergei V. Shabanov We present a rigorous study of a dynamical model for a nonsymmetric expansion of laser-induced plasma plumes into the vacuum. The model is used in the laser film deposition technique and for remote chemical analysis in the so-called laser-induced breakdown spectroscopy. It defines a particular class ... [J. Math. Phys. 49, 093101 (2008)] published Wed Sep 3, 2008.
physicsworld.com: headline news
Cloud-seeding ships could combat climate change
Thu, 04 Sep 2008 09:20:56 -0000
Pumping salt water into the air could keep global temperatures stable for decades, say scientists
Shedding light on artificial atoms
Wed, 03 Sep 2008 14:30:46 -0000
New technique of 'amplitude spectroscopy' works at frequencies where conventional spectroscopy is difficult
Graphene pioneers bag Europhysics prize
Tue, 02 Sep 2008 14:45:56 -0000
Andre Geim and Kostya Novoselov recognized for discovering new carbon material just one atom thick
Physics Today magazine
Wireless is Everywhere - Sponsored Link
Mon, 01 Sep 2008 08:00:00 -0500
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Modeling the physics of storm surges
Mon, 01 Sep 2008 08:00:00 -0500
Despite the potentially catastrophic consequences of storm surges, the physics of surge generation and propagation has historically been poorly understood, and many misconceptions about surges still exist
The gas centrifuge and nuclear weapons proliferation
Mon, 01 Sep 2008 08:00:00 -0500
Uranium enrichment by centrifugation is the basis for the quick and efficient production of nuclear fuel—or nuclear weapons
Ask the Experts - Answers to physics questions at Scientific American.
Meta Description: [ Science questions and science expert answers in chemistry, physics, astronomy, mathematics, computers, environment, geology, medicine ]
Eric Weisstein's Treasure Trove of Physics - Online encyclopedia of physics terms and formulas. Full searchable, and also browsable alphabetically and by topic. Part of Eric's Treasure Troves of Science.
Meta Description: [ Eric Weisstein's World of Physics ]
Physics and Astronomy Classification Scheme (PACS) - Hierarchical numbering scheme, developed by the American Institute of Physics, used to identify fields and sub-fields of physics.
Physics Central - Find out how physics is part of your world. We answer your questions on how things work and keep you informed with daily updates on physics in the news. We describe the latest research and the people who are doing it and show you physics in action.
Meta Description: [ With Physics Central, we communicate the excitement and importance of physics to everyone. We invite you to visit our site every week to find out how physics is part of your world. We'll answer your questions on how things work and keep you informed with daily updates on physics in the news. We'l... ]
Physics Central - A page on modern physics, such as quantum mechanics and black holes, and some mathematics.
Meta Description: [ A page about theoretical physics. ]
Physics News Graphics - Diagrams (with captions) appearing in various AIP publications, sorted by category or by date.
Physics on MathPages - Articles, leaning towards a mathematical description, on a wide range of topics in physics.
Physics Post - A tutorial and article driven community. Votes, science news and a discussion forum.
Physics Today - The flagship publication of the American Institute of Physics (AIP). Provides feature articles, news stories, analyses, book and product reviews, a searchable job database, and obituaries.
Meta Description: [ Physics Today – Your daily physics news and research source ]
Physics.org - Searchable database of physics resources from the Institute of Physics which matches a person's question, age and knowledge profile to handpicked sites. Also includes the Physics Life animation.
Meta Description: [ A unique collection of physics resources for students, teachers and parents. It will help you find information based on your age and knowledge of science. ]
PhysicsWeb - Physics news, jobs, equipment buyer's guide, and events.
Meta Description: [ TBA ]
PhysLINK - Links to physics departments, physical societies, journals, job information, and other physics related information.
Meta Description: [ Physics, astronomy and science news, community, education and reference. Job board, directories, forums, chat, education reference, fun and more. ]
Physnet: The Physics Departments and Documents Network - Serves information from physics departments and institutes worldwide: departmental information, locally stored documents, authoring tools, free access journals, jobs, conferences and education material.
Meta Description: [ PhysNet is a portal to physics of the ISN and the EPS ]
PhysOrg.com - Physics news, semiconductor technology news, space news and a scientific forum.
Meta Description: [ PhysOrg news: latest science and technology news ]
Scientific American - Questions That Plague Physics - A conversation with Lawrence M. Krauss, chair of the physics department at Case Western Reserve University.
Meta Description: [ Science and Technology at Scientific American.com: Questions That Plague Physics: A Conversation with Lawrence M. Krauss -- [ COSMOLOGY ] -- Science and Technology from Scientific American: daily science news and technology news, science trivia, science experts, science newsletters, science shop... ]
The Net Advance of Physics - MIT resource providing discussions at various levels of sophistication that cover all areas of physics.
Meta Description: [ The Net Advance of Physics ]
Usenet Physics FAQ - sci.physics frequently asked questions with answers.
What You Want To Know About Physics - Summarizes in simple language, without advanced mathematics, the foundations of physics. The index gives direct access to selected topics.
Journal of Mathematical Physics - Journal of Mathematical Physics: All Topics
Physics Today magazine - The magazine for the physics community
PhysicsWeb News - PhysicsWeb News
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Simultaneity - Albert Einstein The Theory of Relativity:Imagine two observers, one seated in the center of a speeding train car, and another standing on the platform as the train races by. As the center of the car passes the observer on the platform, he sees two bolts of lightning strike the car - one on the front, and one on the rear. The flashes of light from each strike reach him at the same time, so he concludes that the bolts were simultaneous, since he knows that the light from both strikes traveled the same distance at the same speed, the speed of light. ... |
