Tuesday, July 08, 2014

Algebraic Topology



A first course in Algebraic Topology, with emphasis on visualization, geometric intuition and simplified computations. Given by Assoc Prof N J Wildberger at UNSW. The really important aspect of a course in Algebraic Topology is that it introduces us to a wide range of novel objects: the sphere, torus, projective plane, knots, Klein bottle, the circle, polytopes, curves in a way that disregards many of the unessential features, and only retains the essence of the shapes of spaces. What does this exactly mean? That is a key question... The course has some novel features, including Conway's ZIP proof of the classification of surfaces, a rational form of turn angles and curvature, an emphasis on the importance of the rational line as the model of the continuum, and a healthy desire to keep things simple and physical. We try to use pictures and models to guide our understanding.

See Also:

Wednesday, July 02, 2014

Proofing BICEP2

Inflation—the hypothesis that the Universe underwent a phase of superluminal expansion in a brief period following the big bang—has the potential of explaining, from first principles, why the Universe has the structure we see today. It could also solve outstanding puzzles of standard big-bang cosmology, such as why the Universe is, to a very good approximation, flat and isotropic (i.e., it looks the same in all directions). Yet we do not yet have a compelling model, based on fundamental particle physics principles, that explains inflation. And despite its explanatory power and a great deal of suggestive evidence, we still lack an unambiguous and direct probe of inflation. Theorists have developed different models for inflation, which all share a common, robust prediction: Inflation would have created a background of gravitational waves that could have an observable effect. These waves would cause subtle, characteristic distortions of the cosmic microwave background (CMB)—the oldest light in the Universe, released when photons decoupled from matter and the Universe became transparent to radiation. Viewpoint: Peering Back to the Beginning of Time

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First Direct Evidence of Cosmic Inflation


Almost 14 billion years ago, the universe we inhabit burst into existence in an extraordinary event that initiated the Big Bang. In the first fleeting fraction of a second, the universe expanded exponentially, stretching far beyond the view of our best telescopes. All this, of course, was just theory.

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 LSC Congratulates BICEP2 Colleagues

 

18 March 2014 - The BICEP2 Collaboration result, if confirmed, is a landmark discovery in cosmology, allowing us for the first time to peer back almost to the moment of the Big Bang through the observation of the imprint of primordial gravitational waves on the cosmic microwave background. The LIGO Scientific Collaboration congratulates our BICEP colleagues on their accomplishment and will further follow discoveries and implications of these observations with great interest. - See more at: http://www.ligo.org/news/bicep-result.php#sthash.mJlemItG.dpuf
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Sunday, June 29, 2014

Puffing in Large Scale Interactions

This combination of three wavelengths of light from NASA's Solar Dynamics Observatory shows one of the multiple jets that led to a series of slow coronal puffs on Jan. 17, 2013. The light has been colorized in red, green and blue.
Image Credit: Alzate/SDO
A suite of NASA's sun-gazing spacecraft have spotted an unusual series of eruptions in which a series of fast puffs forced the slow ejection of a massive burst of solar material from the sun's atmosphere. The eruptions took place over a period of three days, starting on Jan. 17, 2013. Nathalia Alzate, a solar scientist at the University of Aberystwyth in Wales, presented findings on what caused the puffs at the 2014 Royal Astronomical Society's National Astronomy Meeting in Portsmouth, England. See: Puffing Sun Gives Birth To Reluctant Eruption

Saturday, June 28, 2014

From the Mathematics of Supersymmetry to the Music of Arnold Schoenberg



Published on Jun 28, 2014
https://perimeterinstitute.ca/videos/...

The concept of supersymmetry, though never observed in nature, has driven a great deal of research in theoretical physics over the past several decades. Much has been learned through this research, but many unresolved questions remain. This presentation will describe how these questions can lead one down a surprising path: toward the dodecaphony of Austrian composer Arnold Schoenberg.

Speaker(s):
S. James Gates Jr.
Collection/Series:
Perimeter Institute Public Lecture Series

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On Superposition



Published on Jun 18, 2014
MIT 8.04 Quantum Physics I, Spring 2013
View the complete course: http://ocw.mit.edu/8-04S13
Instructor: Allan Adams

In this lecture, Prof. Adams discusses a series of thought experiments involving "box apparatus" to illustrate the concepts of uncertainty and superposition, which are central to quantum mechanics. The first ten minutes are devoted to course information.

License: Creative Commons BY-NC-SA
More information at http://ocw.mit.edu/terms
More courses at http://ocw.mit.edu
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Wednesday, June 25, 2014

LHC Sound



Sonification is the process of creating sounds that carry information. Musical compositions carry information in the sense that they often describe a place, a time or a feeling; the associations we make between sonic properties such as pitch and physical properties such as speed or size, come to us without effort. The grand aim of the LHCsound project is to ‘dorkify’ the process of encoding information in sound. Our attempts to capture the behaviour of the recently discovered Higgs boson in sounds are presented for your wonder and bafflement. SEE: Lily Asquith

What is Your Theory On Blackhole Radiation?




MSU Professor Chris Adami has found the solution to a long-standing problem with Stephen Hawking's black hole theory. In a groundbreaking study recently published in the journal Classical and Quantum Gravity, Adami found that various types of information, as specific as matter or particles, or as obscure as the contacts in your mobile phone or the contents of a secret diary, never disappear in the black hole to begin with, effectively solving the black hole information paradox of Hawking's theory. See: Plugging the Hole in Hawking's Black Hole Theory
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Why are Black Holes useful? Which are the quantum properties of space and time? And what happens to a Black Hole when it gets older? Assistant Professor Sabine Hossenfelder and Professor Lárus Thorlacius at Nordita talk about why they want to find answers to questions like these. See: Research Presentation: Quantum Gravity and Black Hole Physics Research at Nordita
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See Also:

Black holes, quantum information, and the foundations of physics


Volume 66, Issue 4, April 2013


Quantum mechanics teaches that black holes evaporate by radiating particles—a lesson indicating that at least one pillar of modern physics must fall. See: Black holes, quantum information, and the foundations of physics by Steven B. Giddings, in Physics Today, April 2013


Based on an image from NASA/CXC/M.Weiss
Citation: Phys. Today 66, 4, 30 (2013); http://dx.doi.org/10.1063/PT.3.1946
image of Untitled

of the Schwarzschild black hole solution can be depicted in different ways. In this representation, ingoing light rays always travel along ingoing lines heading toward the top and left at 45°; outgoing light rays asymptotically approach 45° lines at large radius . Massive particles, with their slower speeds, must travel within the light cones (blue) between outgoing and ingoing light rays, as illustrated by the red path. No light ray can escape to infinity from inside the vertical dotted line, the horizon located at the mass-dependent Schwarzschild radius (). Instead, any trajectory beginning inside the horizon is pulled to a central point, the singularity at = 0, where spacetime curvature becomes infinite.
Citation: Phys. Today 66, 4, 30 (2013); http://dx.doi.org/10.1063/PT.3.1946
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"Archaeology, Anthropology, and Interstellar Communication"

"Archaeology, Anthropology, and Interstellar Communication" By Douglas A. Vakoch
"Addressing a field that has been dominated by astronomers, physicists, engineers, and computer scientists, the contributors to this collection raise questions that may have been overlooked by physical scientists about the ease of establishing meaningful communication with an extraterrestrial intelligence. These scholars are grappling with some of the enormous challenges that will face humanity if an information-rich signal emanating from another world is detected. By drawing on issues at the core of contemporary archaeology and anthropology, we can be much better prepared for contact with an extraterrestrial civilization, should that day ever come."

Tuesday, June 24, 2014

Space Law

Space law is an area of the law that encompasses national and international law governing activities in outer space. International lawyers have been unable to agree on a uniform definition of the term "outer space", although most lawyers agree that outer space generally begins at the lowest altitude above sea level at which objects can orbit the Earth, approximately 100 km (60 mi).

The inception of the field of space law began with the launch of the world's first artificial satellite by the Soviet Union in October 1957. Named Sputnik 1, the satellite was launched as part of the International Geophysical Year. Since that time, space law has evolved and assumed more importance as mankind has increasingly come to use and rely on space-based resources.


NASA STS-121 Launch

Early developments

Beginning in 1957, nations began discussing systems to ensure the peaceful use of outer space.[1][2] Bilateral discussions between the United States and USSR in 1958 resulted in the presentation of issues to the UN for debate.[1][3][4] In 1959, the UN created the Committee on the Peaceful Uses of Outer Space (COPUOS).[5] COPUOS in turn created two subcommittees, the Scientific and Technical Subcommittee and the Legal Subcommittee. The COPUOS Legal Subcommittee has been a primary forum for discussion and negotiation of international agreements relating to outer space.

International treaties

Five international treaties have been negotiated and drafted in the COPUOS:
  • The 1967 Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies (the "Outer Space Treaty").
  • The 1968 Agreement on the Rescue of Astronauts, the Return of Astronauts and the Return of Objects Launched into Outer Space (the "Rescue Agreement").
  • The 1972 Convention on International Liability for Damage Caused by Space Objects (the "Liability Convention").
  • The 1975 Convention on Registration of Objects Launched into Outer Space (the "Registration Convention").
  • The 1979 Agreement Governing the Activities of States on the Moon and Other Celestial Bodies (the "Moon Treaty").
The outer space treaty is the most widely adopted treaty, with 100 parties.[6] The rescue agreement, the liability convention and the registration convention all elaborate on provisions of the outer space treaty. UN delegates apparently intended[according to whom?] that the moon treaty serve as a new comprehensive treaty which would supersede or supplement the outer space treaty, most notably by elaborating upon the outer space treaty's provisions regarding resource appropriation and prohibition of territorial sovereignty.[7] The moon treaty has only 13 parties however, and many consider it to be a failed treaty due to its limited acceptance.[6] India is the only nation that has both signed the moon treaty and declared itself interested in going to the moon. India has not ratified the treaty; an analysis of India's treaty law is required to understand how this affects India legally.[8]
In addition, the 1963 Treaty Banning Nuclear Weapon Tests in the Atmosphere, in Outer Space, and Under Water ("Partial Test Ban Treaty") banned the testing of nuclear weapons in outer space.

International principles and declarations

The five treaties and agreements of international space law cover "non-appropriation of outer space by any one country, arms control, the freedom of exploration, liability for damage caused by space objects, the safety and rescue of spacecraft and astronauts, the prevention of harmful interference with space activities and the environment, the notification and registration of space activities, scientific investigation and the exploitation of natural resources in outer space and the settlement of disputes." [9]
The United Nations General Assembly adopted five declarations and legal principles which encourage exercising the international laws, as well as unified communication between countries. The five declarations and principles are:
  • The Declaration of Legal Principles Governing the Activities of States in the Exploration and Uses of Outer Space (1963)
All space exploration will be done with good intentions and is equally open to all States that comply with international law. No one nation may claim ownership of outer space or any celestial body. Activities carried out in space must abide by the international law and the nations undergoing these said activities must accept responsibility for the governmental or non-governmental agency involved. Objects launched into space are subject to their nation of belonging, including people. Objects, parts, and components discovered outside the jurisdiction of a nation will be returned upon identification. If a nation launches an object into space, they are responsible for any damages that occur internationally.
  • The Principles Governing the Use by States of Artificial Earth Satellites for International Direct Television Broadcasting (1982)
Activities of this nature must be transpire in accordance with the sovereign rights of States. Said activities should "promote the free dissemination and mutual exchange of information and knowledge in cultural and scientific fields, assist in educational, social and economic development, particularly in the developing countries, enhance the qualities of life of all peoples and provide recreation with due respect to the political and cultural integrity of States." All States have equal rights to pursue these activities and must maintain responsibility for anything carried out under their boundaries of authority. States planning activities need to contact the Secretary-General of the United Nations with details of the undergoing activities.
  • The Principles Relating to Remote Sensing of the Earth from Outer Space (1986)
Fifteen principles are stated under this category. The basic understanding comes from these descriptions given by the United Nations Office for Outer Space Affairs:
(a) The term "remote sensing" means the sensing of the Earth's surface from space by making use of the properties of electromagnetic waves emitted, reflected or :diffracted by the sensed objects, for the purpose of improving natural resources management, land use and the protection of the environment;
(b) The term "primary data" means those raw data that are acquired by remote sensors borne by a space object and that are transmitted or delivered to the ground :from space by telemetry in the form of electromagnetic signals, by photographic film, magnetic tape or any other means;
(c) The term "processed data" means the products resulting from the processing of the primary data, needed to make such data usable;
(d) The term "analysed information" means the information resulting from the interpretation of processed data, inputs of data and knowledge from other sources;
(e) The term "remote sensing activities" means the operation of remote sensing space systems, primary data collection and storage stations, and activities in :processing, interpreting and disseminating the processed data.[10]
  • The Principles Relevant to the Use of Nuclear Power Sources in Outer Space (1992)
"States launching space objects with nuclear power sources on board shall endeavour to protect individuals, populations and the biosphere against radiological hazards. The design and use of space objects with nuclear power sources on board shall ensure, with a high degree of confidence, that the hazards, in foreseeable operational or accidental circumstances, are kept below acceptable levels..."
  • The Declaration on International Cooperation in the Exploration and Use of Outer Space for the Benefit and in the Interest of All States, Taking into Particular Account the Needs of Developing Countries (1996)
"States are free to determine all aspects of their participation in international cooperation in the exploration and use of outer space on an equitable and mutually acceptable basis. All States, particularly those with relevant space capabilities and with programmes for the exploration and use of outer space, should contribute to promoting and fostering international cooperation on an equitable and mutually acceptable basis. In this context, particular attention should be given to the benefit for and the interests of developing countries and countries with incipient space programmes stemming from such international cooperation conducted with countries with more advanced space capabilities. International cooperation should be conducted in the modes that are considered most effective and appropriate by the countries concerned, including, inter alia, governmental and non-governmental; commercial and non-commercial; global, multilateral, regional or bilateral; and international cooperation among countries in all levels of development."

Consensus

The United Nations Committee on the Peaceful Uses of Outer Space and its Scientific and Technical and Legal Subcommittees operate on the basis of consensus, i.e. all delegations from member States must agree on any matter, be it treaty language before it can be included in the final version of a treaty or new items on Committee/Subcommittee's agendas. One reason that the U.N. space treaties lack definitions and are unclear in other respects, is that it is easier to achieve consensus when language and terms are vague. In recent years, the Legal Subcommittee has been unable to achieve consensus on discussion of a new comprehensive space agreement (the idea of which, though, was proposed just by a few member States). It is also unlikely that the Subcommittee will be able to agree to amend the Outer Space Treaty in the foreseeable future. Many space faring nations seem to believe that discussing a new space agreement or amendment of the Outer Space Treaty would be futile and time consuming, because entrenched differences regarding resource appropriation, property rights and other issues relating to commercial activity make consensus unlikely.

1998 ISS agreement

In addition to the international treaties that have been negotiated at the United Nations, the nations participating in the International Space Station have entered into the 1998 Agreement among the governments of Canada, Member States of the European Space Agency, Japan, Russian Federation, and the United States of America concerning cooperation on the Civil International Space Station (the "Space Station Agreement"). This Agreement provides, among other things, that NASA is the lead agency in coordinating the member states' contributions to and activities on the space station, and that each nation has jurisdiction over its own module(s). The Agreement also provides for protection of intellectual property and procedures for criminal prosecution. This Agreement may very well serve as a model for future agreements regarding international cooperation in facilities on the Moon and Mars, where the first off-world colonies and scientific/industrial bases are likely to be established.[11]

National law

Space law also encompasses national laws, and many countries have passed national space legislation in recent years. The Outer Space Treaty requires parties to authorize and supervise national space activities, including the activities of non-governmental entities such as commercial and non-profit organizations. The Outer Space Treaty also incorporates the UN Charter by reference, and requires parties to ensure that activities are conducted in accordance with other forms of international law such as customary international law (the custom and practice of states).

The advent of commercial space activities beyond the scope of the satellite communications industry, and the development of many commercial spaceports, is leading many countries[which?] to consider how to regulate private space activities.[12] The challenge is to regulate these activities in a manner that does not hinder or preclude investment, while still ensuring that commercial activities comply with international law. The developing nations are concerned that the space faring nations will monopolize space resources.[12] However this may be resolved by simply extending the United Nations Convention on the Law of the Sea to outer space.[13]

Geostationary orbit allocation

Satellites in geostationary orbit must all occupy a single ring above the equator, approximately 35,800 km into space. The requirement to space these satellites apart means that there is a limited number of orbital "slots" available, thus only a limited number of satellites can be placed in geostationary orbit. This has led to conflict between different countries wishing access to the same orbital slots (countries at the same longitude but differing latitudes). These disputes are addressed through the ITU allocation mechanism.[14] Countries located at the Earth's equator have also asserted their legal claim to control the use of space above their territory,[15] notably in 1976, when many countries located at the Earth's equator created the Bogota Declaration, in which they asserted their legal claim to control the use of space above their territory.[16]

Future


American Society of International Law Space Interest Group 2014 Board meeting
While this field of the law is still in its infancy, it is in an era of rapid change and development. Arguably the resources of space are infinite. If commercial space transportation becomes widely available, with substantially lower launch costs, then all countries will be able to directly reap the benefits of space resources. In that situation, it seems likely that consensus will be much easier to achieve with respect to commercial development and human settlement of outer space. High costs are not the only factor preventing the economic exploitation of space: it is argued that space should be considered as a pristine environment worthy of protection and conservation, and that the legal regime for space should further protect it from being used as a resource for Earth's needs.[17][18] Debate is also focused on whether space should continue to be legally defined as part of the “common heritage of man,” and therefore unavailable for national claims, or whether its legal definition should be changed to allow private property in space.[17][19][20]

Michael Dodge, of Long Beach, Mississippi, is the first law school graduate to receive a space law certificate in the United States.[21][22] Dodge graduated from the National Center for Remote Sensing, Air and Space Law at the University of Mississippi School of Law in 2008.[23][24]

The University of Sunderland is the first UK University to offer a space law module as part of its LLB programme.[citation needed] [25]

The University of Nebraska College of Law offers the U.S.’s first and only LL.M. in space and telecommunications law.[26] Professor Frans von der Dunk, former Director of space law research at Leiden University joined the program in 2007. In addition to the LL.M., students can earn a J.D. at Nebraska Law with an emphasis in space and telecommunications law. The program also hosts three space and telecommunications conferences each year [27][full citation needed]

For more than 10 years, the University of Paris-Sud with the Institute of Space and Telecommunications Law have offered a Master's degree in Space Activities and Telecommunications Law. This Master is supported by numerous companies of space and telecommunications sectors.[28]

In August 2012, students at the University of the Pacific, McGeorge School of Law in Sacramento, California created the McGeorge Society for Space Law and Policy.[citation needed]

In September 2012, the Space Law Society (SLS) at the University of Maryland Francis King Carey School of Law was established.[29] A legal resources team united in Maryland, a "Space Science State," with Jorge Rodriguez, Lee Sampson, Patrick Gardiner, Lyra Correa and Juliana Neelbauer as SLS founding members.[30]

NASA's plans to capture an asteroid has raised questions about how space law would be applied in practice.[31]

See also

References

  1. inesap.org Peaceful Uses of Outer Space and International Law.
  2. UN website UN Resolution 1148 (XII).
  3. Google books Nuclear Weapons and Contemporary International Law N.Singh, E. WcWhinney (p.289)
  4. UN website UN Resolution 1348 (XIII).
  5. "United Nations Committee on the Peaceful Uses of Outer Space". United Nations Office for Outer Space Affairs.
  6. "Journal of Space Law". Journal of Space Law 2. 1974.
  7. "Space Law".
  8. United Nations Office for Outer Space Affairs. "United Nations Treaties and Principles on Space Law.". Retrieved 16 February 2011.
  9. "United Nations Office for Outer Space Affairs".
  10. "Space Law and Space Resources".
  11. "Space Law".
  12. Wong, Kristina. "Rumsfeld still opposes Law of Sea Treaty." The Washington Times, June 14, 2012.
  13. [1][dead link]
  14. ESA - ECSL European Centre for Space Law - Geostationary Orbit. Legal issues
  15. Thompson, J. (1996) Space for rent: the International Telecommunications Union, space law, and orbit/spectrum leasing, Journal of Air Law and Commerce, 62, 279-311
  16. Billings, L. (2006) To the Moon, Mars, and beyond: culture, law, and ethics in space-faring societies, Bulletin of Science, Technology & Society, 26(5), 430-437
  17. Lee, K. (1994) Awe and humility: intrinsic value in nature – beyond an earthbound environmental ethics, in: Attfield, R. & Belsey, A. Philosophy and the Natural Environment, Cambridge: Cambridge University Press, 89-101
  18. Fountain, L. (2003) Creating the momentum in Space: ending the paralysis produced by the “Common a Heritage of Man” doctrine, Connecticut Law Review, 35(4), 1753-1787
  19. Pop, Virgiliu (2009). Who Owns the Moon?: Extraterrestrial Aspects of Land and Mineral Resources Ownership. Space Regulations Library. Springer. ISBN 978-1-4020-9134-6.
  20. //www.thedmonline.com/2.2838/um-space-law-only-of-its-kind-1.107176 The Daily Mississippian: UM space law only of its kind]
  21. "Deccan Herald: Beyond the blue yonder". Archived from the original on 2009-05-07.
  22. Space.com: First Space Lawyer Graduates - Posted May 8, 2008; Accessed May 13, 2008
  23. Law Graduation Includes First-Time Certificate in Space Law, Newswise, May 8, 2008
  24. "A Space Odyssey to the University Of Sunderland".
  25. // posted by Lawyer Gaga @ 6:58 PM. "Space Law Probe: Nebraska Space Law Program to Liftoff". Spacelawprobe.blogspot.com. Retrieved 2013-03-12.
  26. "Space, Cyber, and Telecommunications Law | University of Nebraska–Lincoln". Spaceandtelecomlaw.unl.edu. Retrieved 2013-03-12.
  27. "Partenaires M2 Droit des Activités Spatiales et des Télécommunications & IDEST - IDEST - Institut du Droit de l'Espace et des Télécoms". Idest-paris.org. Retrieved 2013-03-12.
  28. by P.J. Blount. "New Space Law Society | Res Communis". Rescommunis.olemiss.edu. Retrieved 2013-03-12.
  29. http://www.choosemaryland.org/industry/documents/spacefullreport.pdf
  30. David, Leonard (August 30, 2013). "Is NASA's Plan to Lasso an Asteroid Really Legal?". Space.com. Retrieved February 20, 2014.

External links