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| 3. |
- Huggett, Nick, et al.
(författare)
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Lost horizon? : modeling black holes in string theory
- 2021
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Ingår i: European Journal for Philosophy of Science. - : Springer. - 1879-4912 .- 1879-4920. ; 11:3
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Tidskriftsartikel (refereegranskat)abstract
- The modeling of black holes is an important desideratum for any quantum theory of gravity. Not only is a classical black hole metric sought, but also agreement with the laws of black hole thermodynamics. In this paper, we describe how these goals are achieved in string theory. We review black hole thermodynamics, and then explicate the general stringy derivation of classical spacetimes, the construction of a simple black hole solution, and the derivation of its entropy. With that in hand, we address some important philosophical and conceptual questions: the confirmatory value of the derivation, the bearing of the model on recent discussions of the so-called 'information paradox', and the implications of the model for the nature of space.
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- Johansson, Lars-Göran, et al.
(författare)
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String theory and general methodology : A mutual evaluation
- 2011
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Ingår i: Studies in history and philosophy of modern physics. - : Elsevier BV. - 1355-2198 .- 1879-2502. ; 42:3, s. 199-210
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Tidskriftsartikel (refereegranskat)abstract
- String theory has been the dominating research field in theoretical physics during the last decades. Despite the considerable time elapse, no new testable predictions have been derived by string theorists and it is understandable that doubts have been voiced. Some people have argued that it is time to give up since testability is wanting. But the majority has not been convinced and they continue to believe that string theory is the right way to go. This situation is interesting for philosophy of science since it highlights several of our central issues. In this paper we will discuss string theory from a number of different perspectives in general methodology. We will also relate the realism/antirealism debate to the current status of string theory. Our goal is two-fold; both to take a look at string theory from philosophical perspectives and to use string theory as a test case for some philosophical issues.
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- Kato, Norihiro, et al.
(författare)
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Trans-ancestry genome-wide association study identifies 12 genetic loci influencing blood pressure and implicates a role for DNA methylation
- 2015
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Ingår i: Nature Genetics. - : Nature Publishing Group. - 1061-4036 .- 1546-1718. ; 47:11, s. 1282-1293
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Tidskriftsartikel (refereegranskat)abstract
- We carried out a trans-ancestry genome-wide association and replication study of blood pressure phenotypes among up to 320,251 individuals of East Asian, European and South Asian ancestry. We find genetic variants at 12 new loci to be associated with blood pressure (P = 3.9 × 10−11 to 5.0 × 10−21). The sentinel blood pressure SNPs are enriched for association with DNA methylation at multiple nearby CpG sites, suggesting that, at some of the loci identified, DNA methylation may lie on the regulatory pathway linking sequence variation to blood pressure. The sentinel SNPs at the 12 new loci point to genes involved in vascular smooth muscle (IGFBP3, KCNK3, PDE3A and PRDM6) and renal (ARHGAP24, OSR1, SLC22A7 and TBX2) function. The new and known genetic variants predict increased left ventricular mass, circulating levels of NT-proBNP, and cardiovascular and all-cause mortality (P = 0.04 to 8.6 × 10−6). Our results provide new evidence for the role of DNA methylation in blood pressure regulation.
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- Matsubara, Keizo, et al.
(författare)
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Invariant Star Products on S 2 and the Canonical Trace
- 2004
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Ingår i: Letters in Mathematical Physics. - : Springer Science and Business Media LLC. - 0377-9017 .- 1573-0530. ; 70:2, s. 109-120
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Tidskriftsartikel (refereegranskat)abstract
- We calculate the canonical trace and use the Fedosov–Nest–Tsygan index theorem to obtain the characteristic class for a star product on S 2. We show how, for this simple example, it is possible to extract the relevant information needed to use the Fedosov–Nest–Tsygan index theorem from a local calculation.
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| 8. |
- Matsubara, Keizo, et al.
(författare)
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Opens strings in simple current orbifolds
- 2002
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Ingår i: Nuclear Physics B. - 0550-3213 .- 1873-1562. ; 626:1-2, s. 53-72
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Tidskriftsartikel (refereegranskat)abstract
- We study branes and open strings in a large class of orbifold backgrounds using microscopic techniques of boundary conformal field theory. In particular, we obtain factorizing operator product expansions of open string vertex operators for such branes. Applications include branes in orbifolds of the SU(2) WZW model and in the D-series of unitary minimal models considered previously by Runkel.
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- Matsubara, Keizo, 1977-
(författare)
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Realism, underdetermination and string theory dualities
- 2013
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Ingår i: Synthese. - : Springer Science and Business Media LLC. - 0039-7857 .- 1573-0964. ; 190:3, s. 471-489
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Tidskriftsartikel (refereegranskat)abstract
- String theory promises to be able to provide us with a working theory of quantum gravity and a unified description of all fundamental forces. In string theory there are so called 'dualities'; i.e. different theoretical formulations that are physically equivalent. In this article these dualities are investigated from a philosophical point of view. Semantic and epistemic questions relating to the problem of underdetermination of theories by data and the debate on realism concerning scientific theories are discussed. Depending on ones views on semantic issues and realism different interpretations are possible of the dualities.
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