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Topic: Gravitino

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	Gravitino.com - Siew-Phang Ng's Web Haunt
		However, in their last line, perhaps out of some misconception on the part of the author, the entry claims that the gravitino should be naturally heavy because of the gauge hierarchy problem.
		It is precisely because of the gauge hierarchy problem that we cannot break supersymmetry at high scales (the caveat being the class of strongly coupled conformal field theories that Goh, Markus and I constructed under the "SUSY without SUSY" paradigm) and expect a technically natural low energy theory.
		Thus, we need to break supersymmetry at lower energies with the consequence that a light gravitino is forced on most models that endeavour to capture some degree of realism.
	gravitino.com (541 words)

	Supergravity Summary
		When the gravitino is charged under some of the vector fields in the theory, the theory is called gauged supergravity.
		Gravitinos are fermions, which means that according to the spin-statistics theorem they must have an odd number of spinorial indices.
		In fact the gravitino field has one spinor and one vector index, which means that gravitinos transform as a tensor product of a spinorial representation and the vector representation of the Lorentz group.
	www.bookrags.com /Supergravity (5185 words)

	Australian Information from Wikipedia
		When the gravitino is charged under some of the vector fields in the theory, the theory is called gauged supergravity.
		Gravitinos are fermions, which means that according to the spin-statistics theorem they must have an odd number of spinorial indices.
		In fact the gravitino field has one spinor and one vector index, which means that gravitinos transform as a tensor product of a spinorial representation and the vector representation of the Lorentz group.
	www.thinkingaustralia.com /thinking_australia/wikipedia/default.php?title=Supergravity (5042 words)

	[0705.0219] Determining the Mass for a Light Gravitino
		Title: Determining the Mass for a Light Gravitino
		Abstract: Gauge mediated supersymmetry breaking scenarios with an ultra-light gravitino of mass m_{3/2}=1-10 eV are very interesting, since there is no cosmological gravitino problem.
		We propose a new experimental determination of the gravitino mass for such an ultra-light gravitino, by measuring a branching ratio of two decay modes of sleptons.
	arxiv.org /abs/0705.0219 (82 words)

	Citebase - Gravitino Dark Matter in the CMSSM With Improved Constraints from BBN (Site not responding. Last check: )
		In the framework of the Constrained MSSM we re--examine the gravitino as the lightest superpartner and a candidate for cold dark matter in the Universe.
		Assuming the gravitino mass in the GeV to TeV range, and for natural ranges of other supersymmetric parameters, the neutralino region is excluded, while for smaller values of the gravitino mass it becomes allowed again.
		The gravitino relic abundance is consistent with observational constraints on cold dark matter from BBN and CMB in some well defined domains of the stau region but, in most cases, only due to a dominant contribution of the thermal population.
	www.citebase.org /abstract?id=oai:arXiv.org:hep-ph/0509275 (330 words)

	Individual Talk Listing
		Hadronic decay of the gravitino in the early universe and its implications to particle cosmology
		In the inflationary universe, gravitinos are produced after the reheating and may decay during the big-bang nucleosynthesis (BBN).
		I will discuss the effects of the decay of the gravitino on the BBN and derive upper bounds on the reheating temperature after the inflation.
	www.pascos04.neu.edu /Site/AbstractQuery.php?25 (105 words)

	A Bound on the Gravitino Mass from Fat Gravity and Thin Cosmological Constant (Site not responding. Last check: )
		A Bound on the Gravitino Mass from Fat Gravity and Thin Cosmological Constant
		I study the proposal made by R.Sundrum that the small cosmological constant may be natural if we give up pointlike gravitons and pointlike gravitational couplings at distances shorter than about 20 microns ("fat gravity").
		I show model-independently that in order for this scenario to coexist with a supersymmetric extension of the standard model, the gravitino mass must be less than about (20 micron)^(-1) or 10^(-2) eV.
	hep.bu.edu /abstracts/okui-apr-05.html (100 words)

	Munch
		The gravitino is a promising candidate for cold dark matter.
		We study cosmological constraints on scenarios in which the gravitino is the lightest supersymmetric particle and a charged slepton the next-to-lightest supersymmetric particle (NLSP).
		We examine the present free-streaming velocity of gravitino dark matter and the limits from observations and simulations of cosmic structures.
	www-astro-theory.fnal.gov /events/june1206.html (1120 words)

	Supersymmetry to the rescue? - 4
		As with a gauge boson, the gravitino can gain mass when the ground state of the scalar potential breaks the symmetry of the action.
		In this model, the gravitino acquires a mass by eating a massless Goldstino, but because of the minus sign in the scalar potential, the total vacuum energy can be tuned to be zero.
		The three candidates are: a gravitino (fermionic superpartner to the graviton), a sneutrino (scalar superpartner to the neutrino) or a neutralino (fermionic superpartner to a neutral gauge boson or neutral Higgs scalar).
	superstringtheory.com /experm/exper4a3.html (1011 words)

	Linear Collider.ca - SuperWIMP Dark Matter in Supergravity with a Gravitino LSP (Site not responding. Last check: )
		We investigate supergravity in which the gravitino is the lightest supersymmetric particle (LSP) and a slepton, sneutrino or neutralino is the next-to-lightest supersymmetric particle (NLSP).
		We determine which superpartner masses are viable in all of these cases, applying both electromagnetic and hadronic BBN constraints to the leading two- and three-body NLSP decays.
		This establishes the viability of the gravitino LSP scenario and the possibility of superWIMP gravitino dark matter.
	www.linearcollider.ca /vic04/abstracts/physics/cosmology/abstract20040607133349/document_view?month:int=1&year:int=2007 (170 words)

	Collider signals of gravitino dark matter in bilinearly broken R-parity (Site not responding. Last check: )
		In models with gauge mediated supersymmetry breaking the gravitino is the lightest supersymmetric particle.
		If R-parity is violated the gravitino decays, but with a half-live far exceeding the age of the universe and thus is, in principle, a candidate for the dark matter.
		We consider the decays of the next-to-lightest supersymmetric particle, assumed to be the neutralino.
	www.research-projects.unizh.ch /p7342.htm (117 words)

	susysugra
		The gravitino is massless in the simplest supergravity theories.
		In fact, a finite probability for loop diagrams in a quantum theory of gravity is obtained by including gravitinos in the interaction: (infinite) contributions of the gravitinos cancel those of the gravitons.
		Thus a graviton can be transformed into a gravitino and a gravitino into a spin-1 particle.
	www.dfisica.ubi.pt /~pmoniz/Susysugr.htm (1747 words)

	Typische Signatur für Gauge mediated SUSY Brechung:
		In diesem Modell ist das Gravitino das LSP.
		Dieses zerfällt dann in das Gravitino und ein SM Teilchen.
		Das schwere Neutralino, bzw Slepton zerfällt in das fast masselose Gravitino und entweder das masselose Photon oder das leichte Slepton.
	www.physik.unizh.ch /~kmueller/text/vorlesung/susy/node31.html (108 words)

	Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP
		Promptly decaying lightest neutralinos and long-lived staus are searched for in the context of light gravitino scenarios.
		are excluded for gravitino masses from 10 to 150
		may be set for the stau mass independent of the mass of the gravitino.
	publish.edpsciences.org /articles/epjc/abs/1999/08/epjc1073/epjc1073.html (209 words)

	Citebase - Gravitino Warm Dark Matter with Entropy Production (Site not responding. Last check: )
		Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter.
		We construct a model where the decay of the messenger particles that transmit the supersymmetry breaking to the observable sector generates the required entropy to dilute the gravitino relic density by the required factor of a few to come in line with observations.
		The model is natural, and requires only that the coupling of the messenger sector to the standard model be set so that the decay happens at the appropriate time.
	www.citebase.org /abstract?id=oai:arXiv.org:astro-ph/0108172 (177 words)

	Kazunori Kohri : Cosmological gravitino problem in supergravity (Site not responding. Last check: )
		SUSY is one of the most attractive models in particle physics beyond the standard model (Weinberg-Salam model) because it naturally solves the hierarchy problems in the field theory and realizes the grand unification.
		In the 4D supergravity, wihch is the local theory of SUSY, the existance of gravitino which is the superpartner of graviton is predicted.
		Because the gravitinos are mainly produced in the reheating epoch after the primordial inflation, we can get informations on the reheating.
	www.cfa.harvard.edu /tad/events/2004-2005/s_abstracts/22.html (215 words)

	Supersymmetry to the rescue? - 4
		As with a gauge boson, the gravitino can gain mass when the ground state of the scalar potential breaks the symmetry of the action.
		In this model, the gravitino acquires a mass by eating a massless Goldstino, but because of the minus sign in the scalar potential, the total vacuum energy can be tuned to be zero.
		The three candidates are: a gravitino (fermionic superpartner to the graviton), a sneutrino (scalar superpartner to the neutrino) or a neutralino (fermionic superpartner to a neutral gauge boson or neutral Higgs scalar).
	www.superstringtheory.com /experm/exper4a3.html (1011 words)

	[No title]
		The second one is mainly about the coupling of the gravitino to the 3-form field A - it's sort of like the coupling between the electron and electromagnetic field in QED.
		I know it amounts to adding some terms that are quadratic in the gravitino field, and I know it's required to get the whole Lagrangian to be invariant under a "supersymmetry transformation", which mixes up the gravitino field with the graviton and 3-form fields.
		The remaining part of the representation is irreducible and it's the gravitino.
	math.ucr.edu /home/baez/twf_ascii/week158 (4891 words)

	GRAVITINO FACTS AND INFORMATION (Site not responding. Last check: )
		The gravitino is the hypothetical supersymmetric partner of the graviton, as predicted by theories combining general relativity and supersymmetry, i.e.
		If it exists it is a fermion of spin 3/2.
		If the gravitino is the lightest supersymmetric particle, it could make up most of the dark matter in the universe.
	www.collectiblehomes.com /gravitino (62 words)

	Daniel Ruschmeier - Abstract
		If the gravitino is the lightest supersymmetric particle and all other SUSY particles are too heavy to be created at LEP energies, gravitino pair-production could be the only process involving SUSY particles accessible at LEP.
		From an analysis of the process electron positron to gravitino gravitino photon, a lower limit of 8.9 times 10 to the power -6 eV has been determined at the 95% confidence level.
		Cross section limits have been set depending on the masses of the particles involved in neutralino gravitino production and neutralino pair-production and neutralino decay to gravitino and photon, and for the production of the lightest and second lightest neutralino and pair-production of the second lightest neutralino and its decay to lightest neutralino and photon.
	edoc.hu-berlin.de /docviews/abstract.php?lang=ger&id=10157 (837 words)

	LEP2 SUSY WORKING GROUP GMSB Sleptons
		In the GMSB model, the gravitino is the LSP and the sleptons can be the NLSP.
		Their decay length is arbitrary and depends on the gravitino mass (proportional to the SUSY breaking scale).
		Preliminary results obtained using the analyses documented in [1, 2] using the full OPAL years 1999 and 2000 data with sqrt(s) =192-209 GeV; preliminary results using these data were previously reported in [3], and are updated here using the final processing of the OPAL data.
	lepsusy.web.cern.ch /lepsusy/www/gmsb_summer02/lepgmsb.html (1202 words)

	Publication : T01/082
		Based on the R-parity violation option of the minimal supersymmetric Standard Model, we examine the scenario where the massive gravitino, relic from the hot big-bang, is the lightest supersymmetric particle and can decay through one or several of the trilinear R-parity violating interactions.
		We calculate the rates of the gravitino decay via the various three-body decay channels with final states involving three quarks and/or leptons.
		Therefore, the considered scenario would upset the standard big-bang nucleosynthesis and we conclude that it does not seem to constitute a natural solution for the cosmological gravitino problem.
	www-spht.cea.fr /articles/t01/082 (227 words)

	Amazon.com: gravitino (Site not responding. Last check: )
		is that massless `photino' and `gravitino' fields, with spins z and...
		of the graviton is a gravitino; that of the gluon, a...
		g,,,,,), a spin-3/2 particle, the gravitino, and the graviton.
	www.amazon.com /s?ie=UTF8&keywords=gravitino&index=blended&page=1 (1084 words)

	3.4.3 Gauge Mediated Supersymmetry Breaking (Site not responding. Last check: )
		In the GMSB models, therefore, the LSP is always the gravitino.
		Since the longitudinal component of the now massive gravitino, being the goldstino originally, has an effective coupling with the NLSP that is proportional to
		This makes the NLSP decay into the gravitino relevant to collider phenomenology.
	acfahep.kek.jp /acfareport/node103.html (498 words)

	SLAC-PUB-8782 -- Supersymmetric Extra Dimensions: Gravitino Effects in Selectron Pair Production (Site not responding. Last check: )
		We assume supersymmetry is realized in the bulk and study the interactions of the resulting bulk gravitino Kaluza-Klein (KK) tower of states, with supersymmetry breaking on the brane inducing a light mass for the zero-mode gravitino.
		We derive the 4-d effective theory, including the couplings of the bulk gravitino KK states to fermions and their scalar superpartners.
		The virtual exchange of the gravitino KK states in selectron pair production in polarized $e^+e^-$ collisions is then examined.
	www.slac.stanford.edu /pubs/slacpubs/8000/slac-pub-8782.html (244 words)

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