Abbreviations: References
Book: For books, only the 2-digit publication year nn is given; The full four-digit year is written if it is earlier than 1900. If the level of the book is specified, I = general readership; II = undergrad level; III = grad-research level.

Article in
a collection:
in(nn), where nn is the publication year of the conference proceedings or other collection of articles.

Journal paper: XXX(nn), where XXX is an abbreviation for the journal name, and nn the publication year (four digits only if it is earlier than 1900).

arXiv paper:

from Mach 2007, the format is just aYYMM.
xx/nn, where xx is an abbreviation for the arXiv name, for example
     ap = astro-ph,   cd = chao-dyn,   cm = cond-mat,   gq = gr-qc,
     hl = hep-lat,   hp = hep-ph,   ht = hep-th,   he or hx = hep-ex,
     mp = math-phy,   nl = nlin,   phy = physics,   qp = quant-ph;
and nn the year the paper appeared.
When published, XXX(nn)xx/mm or in(nn)xx/mm (mm omitted if = nn)

Other
abbreviations:
...-in = paper written for a collection, e.g., proceedings;
...-ln = paper from lecture notes;
...-MS = master's thesis;
...-PhD = PhD dissertation;
...-rp = report;
...-wd = withdrawn paper.

Abbreviations: Common Words and Expressions
(most abbreviations have been expanded out; all are being phased out)
1-letter abbreviations for physical quantities:
B magnetic field m mass
E electric field, or energy p momentum, proton
e electron (or unit of electric charge) t time
L angular momentum T temperature
       
2-letter abbreviations:
af asymptotically flat nA non-Abelian
bc boundary condition nc non-commutative
bh black hole ns neutron star
cc cosmological constant pi path integral
cr commutation relation PN Post-Newtonian
CS Chern-Simons (function/theory) ps phase space
cy century qc quantum cosmology
dg differential geometry qg quantum gravity
dS de Sitter space qm quantum mechanics
em electromagnetism Rc Regge calculus
ep equivalence principle RN Reissner-Nordström spacetime
ev expectation value sd self-dual
fb fiber bundle sl spacelike
ft field theory sm statistical mechanics
gr general relativity sn supernova
gt gauge theory sr special relativity
HJ Hamilton-Jacobi tl timelike
hs hypersurface up uncertainty principle
id identity vf vector field
ir infrared th theory
KG Klein-Gordon (equation/theory) wf wave function
KK Kaluza-Klein (theory) wh wormhole
KN Kerr-Newman spacetime YM Yang-Mills (fields/theory)
KS Kantowski-Sachs spacetime    
       
3-letter abbreviations:
AdS Anti-de Sitter space lin linear
aot as opposed to Lor Lorentzian
cst conformal field theory lqc loop quantum cosmology
ctc closed timelike curve lqg loop quantum gravity
cyl cylinder, cylindrical pfb principal fiber bundle
dof degree of freedom rep representation
eos equation of state rev review
gup generalized uncertainty principle tft topological field theory
Lag Lagrangian vev vacuum expectation value
       

Abbreviations: Symbols
 * Indicates a generic comment.
 $ Indicates a definition.
@ Indicates references.
& Indicates people who have worked on a subject, but with no specific reference.
 > Indicates links to other pages.

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