4,039 research outputs found
Quantum discontinuity for massive spin-3/2 with a Lambda term
No full textM.J. Duff, James T. Liu, H. Sat
Differential responding for brain stimulation reward and sucrose in high-alcohol-drinking (HAD) and low-alcohol-drinking (LAD) rats.
No full textSelf-compression of 4.9 µm pulses to sub-40 fs with 2 mJ energy in Zinc Sulfide
No full textNonlinear self-compression of few-cycle multi-mJ pulses at 4.9 µm in ZnS is presented. 80 fs input pulses are compressed to 37 fs with 2.1 mJ energy at a 1 kHz repetition rate. © 2024 The Author(s
The conformal brane-scan: an update
No full textGeneralizing the "The Membrane at the End of the Universe", a 1987 paper
"Supersingletons" by Blencowe and the author conjectured the existence of BPS
p-brane configurations (p=2, 3, 4 ,5) and corresponding CFTs on the boundary of
anti-de Sitter space with symmetries appearing in Nahm's classification of
superconformal algebras: OSp(N|4)~N=8, 4, 2, 1; SU(2,2|N)~N= 4, 2, 1; F^2(4);
OSp(8^*|N), ~N=4, 2$. This correctly predicted the D3-brane with SU(2,2|4) on
AdS_5 x S^5 and the M5-brane with OSp(8^*|4) on AdS_7 x S^4, in addition to the
known M2-brane with OSp(8|4) on AdS_4 x S^7. However, finding non-singular AdS
solutions matching the other symmetries was less straightforward. Here we
perform a literature search and confirm that all of the empty slots have now
been filled, thanks to a number of extra ingredients including warped products
and massive Type IIA. Orbifolds, orientifolds and S-folds also play a part
providing examples not predicted: SU(2,2|3), OSp(3|4), OSp(5|4) and OSp(6|4)
but not OSp(7|4). We also examine the status of p=(0,1) configurations.Comment: 14 pages, minor corrections, added reference
Correction to: Chamoun et al., Bacterial pathogenesis and interleukin-17: interconnecting mechanisms of immune regulation, host genetics, and microbial virulence that influence severity of infection
No full textChamoun MN, Blumenthal A, Sullivan MJ, Schembri MA, Ulett GC. 2018. Bacterial pathogenesis and interleukin-17: interconnecting mechanisms of immune regulation, host genetics, and microbial virulence that influence severity of infection. Critical Reviews in Microbiology. https://doi.org/10.1080/1040841X.2018.1426556.
When the above article was first published online, the below three corrections were missed.
The author ‘Antje Blumenthal’ was wrongly affiliated to the affiliation “cSchool of Chemistry and Molecular Biosciences, and Australian Infectious Disease Research Centre, The University of Queensland, Brisbane, Australia”. Now this affiliation has been removed for this author.
The affiliation ‘bTranslational Research Institute, The University of Queensland Diamantina Institute, Woolloongabba, Australia’ of the author ‘Antje Blumenthal’ should read ‘bThe University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Australia’.
In Table 3, the sentence ‘Benefit of manipulating IL-17 levels to improve immunization strategies M. tuberculosis’ should read “Benefit of manipulating IL-17 levels to improve immunization strategies against M. tuberculosis”.No Full Tex
Generation of 22-mJ, 2.0-ps Pulses from a 1-kHz Ho:YLF Regenerative Chirped Pulse Amplifier
No full textWe report a CW-pumped Ho:YLF regenerative amplifier (RA) delivering pulses with 22.5-mJ energy and 2.0-ps duration at 1 kHz. The RA emitting at 2051 nm is broadband-seeded and implemented in a chirped pulse amplification system. © 2024 The Author(s
How fundamental are fundamental constants?
No full textI argue that the laws of physics should be independent of one’s choice of units or measuring apparatus. This is the case if they are framed in terms of dimensionless numbers such as the fine structure constant, α. For example, the standard model of particle physics has 19 such dimensionless parameters whose values all observers can agree on, irrespective of what clock, rulers or scales… they use to measure them. Dimensional constants, on the other hand, such as ħ, c, G, e and k …, are merely human constructs whose number and values differ from one choice of units to the next. In this sense, only dimensionless constants are ‘fundamental’. Similarly, the possible time variation of dimensionless fundamental ‘constants’ of nature is operationally well defined and a legitimate subject of physical enquiry. By contrast, the time variation of dimensional constants such as c or G on which a good many (in my opinion, confusing) papers have been written, is a unit-dependent phenomenon on which different observers might disagree depending on their apparatus. All these confusions disappear if one asks only unit-independent questions. We provide a selection of opposing opinions in the literature and respond accordingly
Near-horizon brane-scan revived
No full textAbstractIn 1987 two versions of the brane-scan of D-dimensional super p-branes were put forward. The first pinpointed those (p,D) slots consistent with kappa-symmetric Green–Schwarz type actions; the second generalized the membrane at the end of the universe idea to all those superconformal groups describing p-branes on the boundary of AdSp+2×SD−p−2. Although the second version predicted D3- and M5-branes in addition to those of the first, it came unstuck because the 1/2 BPS solitonic branes failed to exhibit the required symmetry enhancement in the near-horizon limit, except in the non-dilatonic cases (p=2,D=11), (p=3,D=10) and (p=5,D=11). Just recently, however, it has been argued that the fundamental D=10 heterotic string does indeed display a near-horizon enhancement to OSp(8|2) as predicted by the brane-scan, provided α′ corrections are taken into account. If this logic could be extended to the other strings and branes, it would resolve this 21-year-old paradox and provide a wealth of new AdS/CFT dualities, which we tabulate
TASI lectures on branes, black holes and anti-de sitter space
No full textIn the light of the duality between physics in the bulk of anti-de Sitter
space and a conformal field theory on the boundary, we review the M2, D3 and M5
branes and how their near-horizon geometry yields the compactification of D=11
supergravity on S^{7}, Type IIB supergravity on S^{5} and D=11 supergravity on
S^{4}, respectively. We discuss the ``Membrane at the End of the Universe''
idea and its relation to the corresponding superconformal singleton theories
that live on the boundary of the AdS_{4}, AdS_{5} and AdS_{7} vacua. The
massless sectors of these compactifications are described by the maximally
supersymmetric D=4, D=5 and D=7 gauged supergravities. We construct the
non-linear Kaluza-Klein ans\"atze describing the embeddings of the U(1)^4,
U(1)^3 and U(1)^2 truncations of these supergravities, which admit 4-charge
AdS_{4}, 3-charge AdS_{5} and 2-charge AdS_{7} black hole solutions. These
enable us to embed the black hole solutions back in ten and eleven dimensions
and reinterpret them as M2, D3 and M5 branes spinning in the transverse
dimensions with the black hole charges given by the angular momenta of the
branes. A comprehensive Appendix lists the field equations, symmetries and
transformation rules of D=11 supergravity, Type IIB supergravity, and the M2,
D3 and M5 branes
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