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	Tachyon - Wikipedia, the free encyclopedia
		A tachyon is constrained to the space-like portion of the energy-momentum graph.
		In quantum field theory, a tachyon is a quantum of a field—usually a scalar field—whose squared mass is negative.
		Tachyons are among the fictitious or hypothetical particles frequently invoked in treknobabble, often as a deus ex machina used to maintain the plot.
	en.wikipedia.org /wiki/Tachyon (1467 words)

	Tachyon condensation - Wikipedia, the free encyclopedia
		In physics, tachyon condensation is a process in which a tachyonic field—usually a scalar field—of a negative squared mass acquires a vacuum expectation value and reaches the minimum of the potential energy.
		The appearance of tachyons is a potentially lethal problem for any theory: the notion of an imaginary mass is troubling, and many proposed tachyon models involve violating causality.
		The character of closed string tachyons is more subtle, and the first steps towards our understanding of their fate have been made by Adams, Polchinski, and Silverstein in the case of twisted closed string tachyons.
	en.wikipedia.org /wiki/Tachyon_condensation (289 words)

	Tachyon
		In the language of the theory of special relativity, a tachyon is a particle with space-like four-momentum.
		If a tachyon were to exist and were allowed to interact with ordinary matter, causality could be violated: roughly, there would no longer be a way to tell the difference between the future and the past along the worldline of a given piece of ordinary matter.
		In quantum field theory, a tachyon is a quantum of a field - usually a scalar field - whose squared mass is negative.
	encyclopedia.codeboy.net /wikipedia/t/ta/tachyon.html (646 words)

	Tachyon condensation -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		In (The science of matter and energy and their interactions) physics, tachyon condensation is a process in which a (Click link for more info and facts about tachyonic) tachyonic field—usually a (A field of scalars) scalar field—of a negative squared mass acquires a vacuum expectation value and reaches the minimum of the potential energy.
		The appearance of tachyons is a potentially lethal problem for any theory: the notion of an (Click link for more info and facts about imaginary) imaginary mass is troubling, and many proposed tachyon models involve violating (The relation between causes and effects) causality.
		The character of closed string tachyons is more subtle, and the first steps towards our understanding of their fate have been made by Adams, (Click link for more info and facts about Polchinski) Polchinski, and Silverstein in the case of twisted closed string tachyons.
	www.absoluteastronomy.com /encyclopedia/t/ta/tachyon_condensation.htm (322 words)

	Tachyon (Site not responding. Last check: 2007-10-22)
		A tachyon (from the Greek ταχύς, meaning "swift") is a hypothetical particle that travels at superluminal velocity.
		The first theoretical description of tachyons is attributed to physicist Arnold Sommerfeld; however, the concept has recurred in a variety of other contexts, such as string theory.
		) Tachyons are among the fictitious or hypothetical particles frequently invoked in treknobabble, often as a deus ex machina used to maintain the plot.
	www.worldhistory.com /wiki/T/Tachyon.htm (1359 words)

	Talk 3493 data/Fall_2000/0911 (Site not responding. Last check: 2007-10-22)
		We match the mass and spectrum of fluctuations of this soliton to the D0-D2 conformal field theory.
		This spectrum includes a tachyon: the endpoint of tachyon condensation represents the ``disappearance'' of the D0-brane, and all modes associated with it, as it dissolves in the D2-brane.
		This construction thus sheds some light on issues related to tachyon condensation.
	www.math.duke.edu /mcal?abstract-3493 (92 words)

	String Theory and Cosmology (Site not responding. Last check: 2007-10-22)
		In particular at the minimum of the tachyon potential the total energy density vanishes, showing that this configuration represents closed string vortices, monopoles etc.) involving the tachyon field represent lower dimensional stable and unstable D-branes in the same string theory.
		In particular near the minimum of the potential, the classical solutions in this field theory are in one to one correspondence with the solutions of the equations of motion of non-rotating, non-interacting dust.
		The pressureless matter produced in the process of tachyon condensation can be interpreted as a collection of slow moving heavy closed strings which are produced in the process of tachyon decay.
	nobelprize.org /physics/symposia/ns127/abstract-sen.html (437 words)

	Citebase - Gauge Invariance and Tachyon Condensation in Open String Field Theory
		The problem of tachyon condensation is first described in the context of the low-energy Yang-Mills description of a system of multiple D-branes, and then using the language of string field the...
		The tachyonic instability of the open bosonic string is analyzed using the level truncation approach to string field theory.
		Assuming that around the tachyon vacuum the kinetic term of cubic open string field theory is made purely of ghost operators we are led to gauge invariant actions which manifestly implement the absence of open string dynamics around this vacuum.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-th/0105156 (1360 words)

	Debashis Ghoshal (Site not responding. Last check: 2007-10-22)
		In collaboration with Dileep Jatkar, we made some progress in understanding the process of tachyon condensation in the background of a Neveu-Schwarz fivebrane.
		Tachyon condensation from an exotic discretization, invited talk in the Workshop on String theory at the University of Halle, Halle, Germany.
		Tachyon condensation in the background of the NS-fivebrane, seminar at the Tata Institute of Fundamental Research, Mumbai, India.
	www.mri.ernet.in /~annlrepo/node20.html (315 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		B with a title "One loop partition function in the presence of tachyon background and corrections to tachyon condensation" Report-no: LBNL-48165, UCB-PTH-01/16 \\ We compute the one-loop partition function for quadratic tachyon background in open string theory.
		The divergences due to the open and closed string tachyons are treated by analytic continuation in the tachyon mass squared.
		The partition function is further used to study corrections to tachyon condensation processes describing brane descent relations.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-th:0105098 (172 words)

	1. Degrees and Diplomas (Site not responding. Last check: 2007-10-22)
		By turning on a constant B-field, one can handle behaviour of tachyon by using the so-called non-commutative tachyon and it enables us to construct a lower brane as a topologial defect on an unstable brane containing tachyonic modes.
		The problem of the tachyonic potential was studied in a number of papers by using the background independent open string field theory originally proposed by Witten.
		The importance of these problrms is related to the interpretation of all string solutions of the string field equations of motion in terms of string/brane configurations.
	www.phys.uni-sofia.bg /~rash (606 words)

	Debashis Ghoshal (Site not responding. Last check: 2007-10-22)
		The interbrane distance acts as the inflaton, whereas the end of the inflationary epoch is brought about by the onset of the tachyon which rapidly rolls to the minimum of its potential.
		The condensation of tachyon in the presence of a nonzero Neveu-Schwarz field-strength H=dB is investigated.
		The nonlocal effective field theory of the tachyonic scalar of the p-adic string theory is deformed by a noncommutative parameter.
	www.mri.ernet.in /~anlweb/annlrep/yr03_04/acadrep_phys/p0304_ghoshal_d/p0304_ghoshal_d.html (514 words)

	Re: Tachyon Condensation (Site not responding. Last check: 2007-10-22)
		It seems as if part of your question is 'what is the energy comparison between an FTL particle (a tachyon) and a photon moving at the speed of light?'.
		The answer from relativity is that the tachyon energy is multiplied by the square root of minus one.
		In fact the very latest string field papers seem to assume the whole tachyon condensation thing as a given background and move on to further topics.
	superstringtheory.com /forum/dualboard/messages13/111.html (291 words)

	MIT Physics Faculty: Barton Zwiebach
		Zwiebach has also made important contributions to the subject of D-branes with exceptional symmetry and to the subject of tachyon condensation.
		In 1999, Ashoke Sen and Zwiebach showed that open string field theory can be used to calculate the tachyon potential and to confirm the existence of a critical point at the expected depth.
		The developments that followed led to vacuum string field theory, a new version of open string field theory based on the vacuum of the tachyon.
	web.mit.edu /physics/facultyandstaff/faculty/barton_zwiebach.html (382 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		It is argued that the condensation of both open and closed string tachyons in the orientifold corresponds to the annihilation of branes and antibranes in the F-theory dual.
		One likely end-point of tachyon condensation is thus expected to be the vacuum of Type-IIB superstring.
		Some speculations are presented about the F-theory dual of the bosonic string and tachyon condensation thereof.
	www.elsevier.com /cdweb/journals/05503213/articles/639/1-2/S055032130200501.abstract.en (69 words)

	Tachyon
		) In general, tachyons are a standby mechanism upon which many science fiction authors rely to establish faster-than-light communication, with or without reference to causality issues.
		Gregory Benford's novel Timescape, winner of the Nebula Award, involves the use of tachyons to transmit a message of salvation back in time.
		See also Superbradyon, X-waves, Poincaré symmetry Tachyon is also the product codename for a series Fiber-Channel Controllers made by Agilent Technologies used in many Enterprise Storage Area Networks (SANS).
	www.datamass.net /ta/tachyon.html (1262 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The tachyon field acts on any bare boundary state: the Neumann or the Dirichlet state, and generates the boundary state suggested by S.P. de Alwis, which leads to the correct ratio between D-brane tensions.
		Using the formulation based on this evidence, we suggest that the coordinates in which there exist tachyons on an unstable D-brane be identified as the soliton coordinates in integrable systems.
		We further see how these amplitudes are affected through the tachyon condensation by integrating the correlators over the tachyon momenta and taking the on-shell limit.
	www.thphys.uni-heidelberg.de /cgi-bin/abstracts/hep-th:0408149 (148 words)

	MIT Physics Faculty: Washington Taylor IV
		"D-branes, tachyons, and string field theory"; lectures on D-branes and recent developments in string field theory, by W. Taylor and B. Zwiebach; to appear in proceedings of TASI 2001, Boulder, Colorado, July 2001; hep-th/0311017.
		"Gauge invariance and tachyon condensation in open string field theory", talk at strings 2001, Mumbai, India, January 7, 2001; [transparencies] and [audio].
		"Tachyon condensation in open string field theory", talk given at PIMS Pacific Northwest seminar on string theory, March 17, 2001; [audio] and [video].
	web.mit.edu /physics/facultyandstaff/faculty/washington_taylor.html (722 words)

	The presentation about tachyons (item 25) by Scott I
		Tachyon research has been performed in our laboratory but it was impossible to publish.
		When the tachyon flies at infinite velocity, thus at zero energy (E=0), it could be considered as pure momentum P=M. Tachyon could be considered as non-local, not well defined in space or time.
		Moreover the tachyon cannot be detected as such: it is only through the recoil of bradyons that its presence can be inferred through the tachyoelectric effect.
	www.fynu.ucl.ac.be /users/j.steyaert (1982 words)

	Mideast 2001 : Talks
		Although in this level, the general shape of the tachyon potential does not change, the tachyon zero mode dependence is quite complicated.
		In particular, the genus expansion is not governed by the effective string coupling which is defined in terms of the tachyon by \lambda=g_s exp(-T^2/4).
		We show that handle removal can be understood easily at the classical level both in the continuous and matrix regularized membrane theories, but that condensation of tachyonic modes must be taken into account to describe handle addition.
	hep.physics.uoc.gr /mideast/participants/talk-list.html (1018 words)

	Tachyon article - Tachyon Greek hypothetical particle superluminal velocity science fiction - What-Means.com (Site not responding. Last check: 2007-10-22)
		Tachyon article - Tachyon Greek hypothetical particle superluminal velocity science fiction - What-Means.com
		(Ships using imperfect cloaking devices are also implied to produce residual tachyon emissions.)
		Tachyon article - Tachyon definition - what means Tachyon
	www.what-means.com /encyclopedia/Tachyon (642 words)

	Sudhakar Panda (Site not responding. Last check: 2007-10-22)
		We proposed a new mechanism of inflating the universe with Non-BPS branes decaying to a BPS branes via tachyon condensation.
		In a single brane scenario the tachyon potential was found to be very steep and unable to support inflation.
		But at the Hagedorn temperature, it is argued that the gauge string condenses followed by decoupling of tachyonic particles.
	www.mri.ernet.in /~annlrepo/node31.html (373 words)

	Kibble Deficit \| Musings
		But as for the tachyon DBI, the situation is very different – First, there is no validation of extracting only the tachyon field, and second, nothing can ensure the higher derivative terms.
		The tachyon DBI action was shown to reproduce spatially homogeneous rolling tachyon CFT results, but that’s it.
		We call the final state tachyon matter, but no one yet knows what it is. The result of this paper, I think, is solely due to the fact that string theory tachyon condensation has no endpoint, and thus the tachyon field cannot bounce back to the origin in order to relax the initial defect density.
	golem.ph.utexas.edu /~distler/blog/archives/000483.html (893 words)

	bardakci research (Site not responding. Last check: 2007-10-22)
		I am interested in string theories in general and in the problem of tachyon condensation in the bosonic string in particular.
		In collaboration with Konechny, a postdoctoral fellow in Berkeley, I am continuing work on the tachyon condensation problem.
		Recently, we have carried out the calculation of the one loop contribution to the tachyonic potential.
	www.physics.berkeley.edu /research/faculty/Bardakci.html (79 words)

	OSU Physics: Calendar of Events
		Description: The past few months have seen a resurgence of interest in open string field theory, triggered by Sen's ideas about tachyon condensation.
		Open string field theory allows a quantitative study of open tachyons off-shell processes.
		I will review recent work in the subject focusing on a proposal to formulate cubic open string field theory directly around the stable vacuum of the tachyon field.
	www.physics.ohio-state.edu /calendar/event.php3?id=223 (106 words)

	Physics Help and Math Help - Physics Forums - arXiv.org and other
		The basic tachyon condensation picture was related to a Yang-Mills description of intersecting branes in [17, 18, 19], where it was shown that the tachyonic mode on the intersecting branes gives rise to a recombination of the branes.
		Putting electric flux on the D-branes, we find a qualitative description of tachyon condensation where intersecting branes recombine, giving a region of empty space between the branes in which the electric flux is replaced by
		Because we are working in the classical Yang-Mills picture, the fundamental string charge is not quantized and the confinement of these strings is not completely apparent; as the recombined D-branes move apart, we are left with a distribution of stretched strings filling the vacuum.
	www.physicsforums.com /printthread.php?t=5992 (861 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		It has been conjectured that at the stationary point of the tachyon potential for the D-brane-anti-D-brane pair or for the non-BPS D-brane of superstring theories, the negative energy density cancels the brane tensions.
		We study this conjecture using a Wess-Zumino-Witten-like open superstring field theory free of contact term divergences and recently shown to give 60% of the vacuum energy by condensation of the tachyon field alone.
		While the action is non-polynomial, the multiscalar tachyon potential to any fixed level involves only a finite number of interactions.
	celestial.eprints.org /cgi-bin/oaia2/arXiv.org?verb=GetRecord&identifier=oai:arXiv.org:hep-th/0002211&metadataPrefix=oai_dc (159 words)

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