Abstract
This paper sets out to show how mathematical modelling can serve as a way of ampliating knowledge. To this end, I discuss the mathematical modelling of time in theoretical physics. In particular I examine the construction of the formal treatment of time in classical physics, based on Barrow’s analogy between time and the real number line, and the modelling of time resulting from the Wheeler-DeWitt equation. I will show how mathematics shapes physical concepts, like time, acting as a heuristic means—a discovery tool—, which enables us to construct hypotheses on certain problems that would be hard, and in some cases impossible, to understand otherwise.
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Notes
- 1.
See Polya (1954), Hanson (1958), Lakatos (1976), Laudan (1977), Simon (1977), Nickles (1980a, b), Simon et al. (1987), Gillies (1995), Grosholz and Breger (2000), Grosholz (2007), Abbott (2004), Darden (2006), Weisberg (2006), Magnani (2001, 2013), Magnani and Li (2007), Nickles and Meheus (2009), Magnani et al. (2010), Gertner (2012), Cellucci (2013), Ippoliti (2011, 2014).
- 2.
That is the strings of symbols representing objects and operations and assembled according to certain syntactic rules.
- 3.
See e.g. Devito (1997) for a non-linear account of time.
- 4.
Note that this would also imply the replacement of the differential equations with difference equations, so the time derivative would be replaced by a finite difference.
- 5.
See Hagar (2014), pp. 64–75, for a careful analysis of the issue.
- 6.
Formally this means that the space is invariant under rotations in space, since rotations can map any direction onto any other direction.
- 7.
Diffeomorphism invariance is a way of mathematically expressing general covariance—the invariance of the form of physical laws under arbitrary differentiable coordinate transformations and then the background independence of a theory.
- 8.
Where \(\partial^{2}\) is the second derivative w.r.t. x; x the position; \(\Psi\) the Shroindger wave function; E the energy; V the potiantial energy.
- 9.
- 10.
See for instance the answer provided by the termal time hypothesis in Connes and Rovelli (1994).
- 11.
- 12.
See e.g. Ippoliti (2006) for a critical examination of the notion of relevance.
- 13.
- 14.
For instance Feynman integrals can be regarded as an altered version of the notion of integral—see Ippoliti (2013).
- 15.
See Kvasz (2008) for a deep account of this point.
- 16.
- 17.
The “machinery” is the term used by Feynman to express the mechanism that explains why, but especially how, certain processes take place—see also Morrison (2000, p. 3) on this point.
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Acknowledgments
I would like to thank Sergio Caprara, Angleo Vulpiani and the other friends at the Dept. of Physics—Sapienza University of Rome for the fruitful dialogues about technical as well as theoretical issues. I would also like to thank the two anonymous referees for their comments and suggestions that helped me to improve the paper.
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Ippoliti, E. (2016). Mathematical Models of Time as a Heuristic Tool. In: Magnani, L., Casadio, C. (eds) Model-Based Reasoning in Science and Technology. Studies in Applied Philosophy, Epistemology and Rational Ethics, vol 27. Springer, Cham. https://doi.org/10.1007/978-3-319-38983-7_7
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