Kimpton-Nye, S. (Forthcoming). Can Hardcore Actualism Validate S5? Philosophy and Phenomenological Research.

Hardcore actualism (HA) grounds all modal truths in the concrete constituents of the actual world (see, e.g., Borghini and Williams 2008; Jacobs 2010; Vetter 2015). I bolster HA, and elucidate the very nature of possibility (and necessity) according to HA, by considering if it can validate S5 modal logic. Interestingly, different considerations pull in different directions on this issue. To resolve the tension, we are forced to think hard about the nature of the hardcore actualist’s modal reality and how radically this departs from possible worlds orthodoxy. Once we achieve this departure, the prospects of a hardcore actualist validation of S5 look considerably brighter. This paper thus strengthens hardcore actualism by arguing that it can indeed validate S5–arguably the most popular logic of metaphysical modality–and, in the process, it elucidates the very nature of modality according to this revisionary, but very attractive, modal metaphysics.

Kimpton-Nye, S. (Forthcoming). Necessary Laws and the Problem of Counterlegals. Philosophy of Science.

Abstract: Substantive counterlegal discourse poses a problem for those according to whom the laws of nature are metaphysically necessary. In this paper, I discern two types of necessitarianism about laws: Dispositional Essentialism and Modal Necessitarianism. I argue that Handfield (2004)’s response to the problem of counterlegals cannot help the Modal Necessitarian who maintains the strong view that all possible worlds are identical with respect to the laws of nature. After noting the use of counterlegal reasoning in scientific modeling, and taking inspiration from Frigg (2010)’s account of scientific models as fictions, I suggest a fictionalist treatment of counterlegals. My response to the problem of counterlegals on behalf of the Modal Necessitarian thus constitutes a rejection of the premise that we must provide a realistic semantics for counterlegals. Fictionalism is not limited by the range of metaphysical possibilities and thus affords the Modal Necessitarian the means to account for the apparent substance of counterlegals even granting the metaphysical necessity of the laws.

Kimpton-Nye, S. (2018). Hardcore Actualism and Possible Non-Existence. Thought: A Journal of Philosophy.

Abstract: According to hardcore actualism (HA), all modal truths are grounded in the concrete constituents of the actual world. In this paper, I discuss some problems faced by HA when it comes to accounting for certain alleged possibilities of non‐existence. I focus particular attention on Leech (2017)’s dilemma for HA, according to which HA must either sacrifice extensional correctness or admit mere possibilia. I propose a solution to Leech’s dilemma, which relies on a distinction between weak and strong possibility. It remains the case, however, that HA cannot capture certain iterated de re possibilities of non‐existence and that it is committed to a stock of necessary existents. But I still think that the virtues of the view outweigh these costs.

Abstract: I argue that an unHumean ontology of irreducibly dispositional properties might be fruitfully combined with what has typically been thought of as a Humean account of laws, namely, the best-system account, made popular by David Lewis (e.g., 1983, 1986, 1994). In this paper I provide the details of what I argue is the most defensible account of Humean laws in an unHumean world. This package of views has the benefits of upholding scientific realism while doing without any suspect metaphysical entities to account for natural law. I conclude by arguing that the Humean laws-unHumean ontology package is well placed to provide an account of objective, nontrivial chances, a famous stumbling block for the Humean laws-Humean ontology package developed by Lewis.

Work in Progress/Under Review

A paper in which I discern a variety of accounts of the relationship between properties and laws of nature that are all roughly in the spirit of dispositional essentialism and in which I argue for what I take to be the best account of laws in terms of low-level physical properties.

A paper which discusses the relationship between properties, laws of nature and the dimensionality of a quantum universe.

Feel free to email me for discussion/drafts (samuel[dot]kimpton-nye[at]kcl[dot]ac[dot]uk).

Thesis Summary

Common Ground for Laws and Modality (click here for full text)

In my PhD thesis, I argue that scientific inquiry into the laws of nature can, to a large extent, inform philosophical inquiry. I build up to this conclusion by accounting for the laws of nature and metaphysical modality in terms of low-level physical properties (just properties from now on), such as charge, mass and spin.

First, I argue that properties are necessarily connected with the range of behaviours towards which they dispose their bearers. Furthermore, I describe exactly how these necessary connections comes about – a task that has been largely neglected in the literature. To get a sense of the argument, consider a spherical object – call it ball. Ball is disposed towards various behaviours: rolling, casing an elliptical shadow, fitting through round holes, etc. Why is ball disposed to behave in these ways? Answer: because it is spherical – the very nature of the property sphericity explains these behaviours in a similar way to that in which the squareness of a peg explains its inability to fit in a round hole. Moreover, anything spherical would be similarly disposed to, e.g., roll. I argue that the property sphericity explains rolling in such a way that the property and the behaviour are necessarily connected. Furthermore, I argue that the relationship between all properties, including those such as charge and mass, and the behaviours with which they are associated can be understood in this way. It follows, contrary to what has been claimed by many philosophers (e.g., Armstrong 1999; Lewis 2009), that it is in no sense possible for an individual to instantiate the property positive charge (for example) and not be disposed to accelerate towards instances of negative charge.

Properties, on the conception sketched above, determine how their instances can be arranged throughout space and time. The laws of nature, I argue, are features of a particularly efficient description of how all and only the properties found at our world are possibly arranged. This view of laws has the benefits of being consonant with actual scientific practice of formulating widely applicable generalizations. It also has the potential to provide a unified account of the laws of nature and chance – something that has proved notoriously challenging (see, e.g., Bigelow, Collins, and Pargetter 1993; Lewis 1994).

I argue that metaphysical modality is also a matter of how properties are possibly arranged throughout space and time. The intuitive thought behind this idea is that something is possible, the vase breaking, say, if (and only if) some property instances can be arranged, such that the vase is broken. Property instances, on this view, are a bit like building blocks and possibility is a matter of how those blocks can be arranged. How the “blocks” can be arranged is determined by the natures of the properties themselves, in much the same way in which ball’s tendency to roll is determined by its sphericity.

It follows from the above that facts about laws of nature and facts about metaphysical modality both hold in virtue low-level physical properties. Indeed, both concern possible arrangements of those properties. Since the laws of nature describe this information about possible property arrangements in a way that is efficient and accessible to us, scientific inquiry into the laws of nature should be our primary means of inquiry into what is metaphysically possible. The result is quite striking when we notice the ubiquity of appeals to metaphysical possibilities in all manner of philosophical arguments: scientific inquiry into the laws can yield a diversity of philosophical insights.