Martin
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Posts posted by Martin
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Latex is broken for the moment. The forum upgrade squished it.
Afaik blike is working on getting it fixed.
[math]\frac{a''}{a}= -\frac{4\pi G}{3}(\rho + 3p)[/math]
I saw something in math forum from Dave about getting it to work
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An interesting clue to current developments in HEP is the Spires HEP database at Stanford/SLAC
http://www.slac.stanford.edu/library/topcites/
Every year Spires puts out a "top Forty" or "top Hundred" list of most-cited research papers and the ranking for 2003 just came out.
http://www.slac.stanford.edu/library/topcites/2003/annual.shtml
Here is the Spires Topcited papers in 2003, with only the recent papers showing. I want to see what kinds of recent papers are getting cited a lot, so I have eliminated everything from 1999 and earlier. (there were a lot of older papers in the Spires list which I went thru and removed by hand)
the number is how many times the paper was cited by papers in the HEP database---ones that appeared in 2003---e.g. the Particle Data Group article was cited by 1702 other papers.
there were 4 recent (since 1999) string papers that got 125 or more citations. to make them easy to spot they are in bold
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1702
REVIEW OF PARTICLE PHYSICS. PARTICLE DATA GROUP
By Particle Data Group (K. Hagiwara et al.).
Most recent version published in Phys.Rev.D66:010001,2002
0812
FIRST YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: DETERMINATION OF COSMOLOGICAL PARAMETERS
By D.N. Spergel, L. Verde, Hiranya V. Peiris, E. Komatsu, M.R. Nolta, C.L. Bennett, M. Halpern, G. Hinshaw, N. Jarosik, A. Kogut, M. Limon, S.S. Meyer, L. Page, G.S. Tucker, J.L. Weiland, E. Wollack, E.L. Wright.
Published in Astrophys.J.Suppl.148:175,2003 [arXiv: astro-ph/0302209]
0505
FIRST YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: PRELIMINARY MAPS AND BASIC RESULTS
By C.L. Bennett, M. Halpern, G. Hinshaw, N. Jarosik, A. Kogut, M. Limon, S.S. Meyer, L. Page, D.N. Spergel, G.S. Tucker, E. Wollack, E.L. Wright, C. Barnes, M.R. Greason, R.S. Hill, E. Komatsu, M.R. Nolta, N. Odegard, Hiranya V. Peiris, L. Verde, J.L. Weiland.
Published in Astrophys.J.Suppl.148:1,2003 [arXiv: astro-ph/0302207]
0351
FIRST RESULTS FROM KAMLAND: EVIDENCE FOR REACTOR ANTI-NEUTRINO DISAPPEARANCE
By KamLAND Collaboration (K. Eguchi et al.).
Published in Phys.Rev.Lett.90:021802,2003 [arXiv: hep-ex/0212021]
0285
DIRECT EVIDENCE FOR NEUTRINO FLAVOR TRANSFORMATION FROM NEUTRAL CURRENT INTERACTIONS IN THE SUDBURY NEUTRINO OBSERVATORY
By SNO Collaboration (Q.R. Ahmad et al.).
Published in Phys.Rev.Lett.89:011301,2002 [arXiv: nucl-ex/0204008]
0197
STRINGS IN FLAT SPACE AND PP WAVES FROM N=4 SUPERYANG-MILLS
By David Berenstein, Juan M. Maldacena, Horatiu Nastase (Princeton, Inst. Advanced Study).
Published in JHEP 0204:013,2002 [arXiv: hep-th/0202021]
0189
MEASUREMENT OF DAY AND NIGHT NEUTRINO ENERGY SPECTRA AT SNO AND CONSTRAINTS ON NEUTRINO MIXING PARAMETERS
By SNO Collaboration (Q.R. Ahmad et al.).
Published in Phys.Rev.Lett.89:011302,2002 [arXiv: nucl-ex/0204009]
0189
WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) FIRST YEAR OBSERVATIONS: TEMPERATURE - POLARIZATION POLARIZATION
By A. Kogut, D.N. Spergel, C. Barnes, C.L. Bennett, M. Halpern, G. Hinshaw, N. Jarosik, M. Limon, S.S. Meyer, L. Page, G. Tucker, E. Wollack, E.L. Wright.
Published in Astrophys.J.Suppl.148:161,2003 [arXiv: astro-ph/0302213]
0186
FINAL RESULTS FROM THE HUBBLE SPACE TELESCOPE KEY PROJECT TO MEASURE THE HUBBLE CONSTANT
By W.L. Freedman, B.F. Madore, B.K. Gibson, L. Ferrarese, D.D. Kelson, S. Sakai, J.R. Mould, R.C. Kennicutt, H.C. Ford, J.A. Graham, J.P. Huchra, S.M.G. Hughes, G.D. Illingworth, L.M. Macri, P.B. Stetson, P.B. Stetson (Carnegie Inst. Observatories & Caltech, IPAC & Swinburne U., Ctr. Astrophys. Supercomput. & Rutgers U., Piscataway & Carnegie Inst., Wash., D.C. & NOAO, Tucson & Res. Sch. Astron. Astrophys., Weston Creek & Arizona U., Astron. Dept. - Steward Observ. & Johns Hopkins U. & Harvard-Smithsonian Ctr. Astrophys. & Cambridge U., Inst. of Astronomy & Lick Observatory & Dominion Astrophys. Obs., Victoria).
Published in Astrophys.J.553:47-72,2001 [arXiv: astro-ph/0012376]
0180
MEASUREMENT OF THE RATE OF NU/E + D --> P + P + E- INTERACTIONS PRODUCED BY B-8 SOLAR NEUTRINOS AT THE SUDBURY NEUTRINO OBSERVATORY
By SNO Collaboration (Q.R. Ahmad et al.).
Published in Phys.Rev.Lett.87:071301,2001 [arXiv: nucl-ex/0106015]
0177
THE SLOAN DIGITAL SKY SURVEY: TECHNICAL SUMMARY
By SDSS Collaboration (Donald G. York et al.).
Published in Astron.J.120:1579-1587,2000 [arXiv: astro-ph/0006396]
0162
FIRST YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: IMPLICATIONS FOR INFLATION
By H.V. Peiris, E. Komatsu, L. Verde, D.N. Spergel, C.L. Bennett, M. Halpern, G. Hinshaw, N. Jarosik, A. Kogut, M. Limon, S.S. Meyer, L. Page, G.S. Tucker, E. Wollack, E.L. Wright (Princeton U. & NASA, Goddard & British Columbia U. & Chicago U., EFI & CFCP, Chicago & Brown U. & UCLA).
Published in Astrophys.J.Suppl.148:213,2003 [arXiv: astro-ph/0302225]
0139
THE SLOAN DIGITAL SKY SURVEY: EARLY DATA RELEASE
By SDSS Collaboration (Chris Stoughton et al.).
Published in Astron.J.123:485-548,2002
0135
ROLLING TACHYON
By Ashoke Sen (Harish-Chandra Res. Inst. & Penn State U.).
Published in JHEP 0204:048,2002 [arXiv: hep-th/0203211]
0134
A PERTURBATIVE WINDOW INTO NONPERTURBATIVE PHYSICS
By Robbert Dijkgraaf (Amsterdam U. & Amsterdam U., Inst. Math.), Cumrun Vafa (Harvard U., Phys. Dept.). [arXiv: hep-th/0208048]
0133
A MEASUREMENT BY BOOMERANG OF MULTIPLE PEAKS IN THE ANGULAR POWER SPECTRUM OF THE COSMIC MICROWAVE BACKGROUND
By Boomerang Collaboration (C.B. Netterfield et al.).
Published in Astrophys.J.571:604-614,2002 [arXiv: astro-ph/0104460]
0130
THE COSMOLOGICAL CONSTANT AND DARK ENERGY
By P.J.E. Peebles (Princeton U.), Bharat Ratra (Kansas State U.).
Published in Rev.Mod.Phys.75:559-606,2003 [arXiv: astro-ph/0207347]
0126
SOLAR B-8 AND HEP NEUTRINO MEASUREMENTS FROM 1258 DAYS OF SUPER-KAMIOKANDE DATA
By Super-Kamiokande Collaboration (S. Fukuda et al.).
Published in Phys.Rev.Lett.86:5651-5655,2001 [arXiv: hep-ex/0103032]
0125
TYPE IIB GREEN-SCHWARZ SUPERSTRING IN PLANE WAVE RAMOND-RAMOND BACKGROUND
By R.R. Metsaev (Lebedev Inst.).
Published in Nucl.Phys.B625:70-96,2002 [arXiv: hep-th/0112044]
0125
INDICATIONS OF NEUTRINO OSCILLATION IN A 250 KM LONG BASELINE EXPERIMENT
By K2K Collaboration (M.H. Ahn et al.).
Published in Phys.Rev.Lett.90:041801,2003 [arXiv: hep-ex/0212007]
0124
NEW GENERATION OF PARTON DISTRIBUTIONS WITH UNCERTAINTIES FROM GLOBAL QCD ANALYSIS
By J. Pumplin, D.R. Stump, J. Huston, H.L. Lai, P. Nadolsky, W.K. Tung (Michigan State U.).
Published in JHEP 0207:012,2002 [arXiv: hep-ph/0201195]
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No it's not.
The sub and sup tags are OK for the basics' date=' we have Latex for more complex equations.[/quote']
that sounds great, but blike said *had* latex
should I assume that it is temporarily not available?
as a test I'll try writing the Friedmann equation that uses
the negative pressure of dark energy to accelerate expansion of U.
[tex]\frac{a''}{a}= -\frac{4\pi G}{3}(rho + 3p)[/tex]
didn't work. what did I do wrong?
is there a help place or a FAQ place here at this board
that would tell me what amenities for writing equations are available and how to use them?
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Sound travels through matter. Water waves etc. travel on a plain.
But how does EM radiation travel? What are the waves generated on? Are they distortions in spacetime itself?
the theory of gravity (GR) that's been in use since 1915 predicts
gravity waves and there is a detector that just went in to operation looking for them
those would be slight temporary distortions in the geometry of spacetime, I picture them as ripples, that spread out from some source like a collapsing star or a near-collision of two very dense stars
but this is not EM!
EM waves are temporary disturbances in the electric field (or electric and magnetic fields treated as a single entity
you are asked first to imagine a static electric field extending outwards from some charged object, the forcefield of that charged object extending out thru all space
and then you are told some equations by which that field can superimposed with all the other similar fields of all the other charges, to make one electric field extending thru out the U
and then you are given some rules (maxwell eqn) by which that field can be twanged and will continue vibrating, with the energy spreading out forever
so that, in imagination, the field is almost a real thing, like a pondsurface or a drumhead or somesuch 3D medium of vibration
but then again it isnt and that was just the classical picture, not the quantum field picture------and physics never answers any basic question, it is just a sequence of improvements in what one imagines.
its all in the imagination and the amazing thing is how well it works
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I like this idea. so much so that I am going to sticky it
Great! I hope other people will add some neat links. I'll post a few I have here too.
here are a couple of goodies:
Ned Wright's cosmology website and FAQ
http://www.astro.ucla.edu/~wright/cosmolog.htm
http://www.astro.ucla.edu/~wright/cosmology_faq.html
Wendy Freedman and Michael Turner's "Measuring and Understanding
the Universe"
http://arxiv.org/astro-ph/0308418
a lot of good astronomy links are graphic rather than verbal, such as
images from the HST and computer animations, also Ned Wright has a calculator that lets you calculate from something's redshift how far away it is.
I'm interested to see what links others here have found useful so I wont rush to post a lot of my favorites
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this thread can be for stashing links to webpages with good explanations of astronomy stuff
in Cosmology forum I just saw where aman asked about the slingshot effect (used a lot to save fuel on missions to the outer planets)
and swansont gave this link:
http://www.mathpages.com/home/kmath114.htm
explaining clearly how the slingshot maneuver gains energy and
angular momentum (taking away from the planet being used)
and then Jenab confirmed having seen slingshotting in simulations
he'd run
http://www.scienceforums.net/forums/showthread.php?p=30823#post30823
I'm thinking of adding other good links i see to this thread, to have them handy. like link-answers to astronomy FAQ. Join in if you feel like it.
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I found another review article which mentions Hawking's
"euclidean quantum gravity" and compares it with loop and string.
http://arxiv.org/gr-qc/9803024
"Strings, loops and others: a critical survey of the present approaches to quantum gravity"
Carlo Rovelli
(Plenary lecture on quantum gravity at the GR15 conference)
-------------
here's a link to get recent preprints of non-string Quantum Gravity research papers:
Last twelve months (e.g. 14 June 2003 to 14 June 2004):
this is designed to catch:
loop quantum gravity
loop quantum cosmology
canonical quantum gravity
simplicial quantum gravity
nonperturbative quantum gravity
spin foam
dynamical triangulation
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You should try this site:http://www.damtp.cam.ac.uk/user/gr/public/qg_qc.html[/url']
Looks like a tribute to the approach Hawking and collaborators pursued
in the 1990s as an alternative to inflation. After a brief 4 line paragraph about inflation, it switches to talking about the alternative:
"The second contender for a theory of initial conditions is quantum cosmology, the application of quantum theory to the entire universe..."
Tesseract, I found a recent review paper which mentions "Euclidean quantum gravity" approach of Hawking et al, but it gives no recent research papers (most was in 1990s I think)
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Does anyone have some QG links they want to recommend as good introductions to the subject, or surveys of current research,
or particularly good for explaining one particular line of research?
As for a good (popularized) intro to Loop Quantum Gravity there is Lee Smolin's January 2004 Scientific American article called "Atoms of Space and Time".
The trouble being that it is not, AFAIK, available free online.
here is another good popularly written article
by the German science journalist
Rudy Vaas
http://arxiv.org/abs/physics/0403112
"The Duel: Loops versus Strings"
this one is available online. Vaas writes for a German magazine
similar to the Scientific American----this article is in English however
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Quick LaTeX Tutorial
in Mathematics
Posted
testing
[math]\frac{a''}{a}= -\frac{4\pi G}{3}(\rho + 3p)[/math]
ahhhh