Zobrazeno 1 - 10
of 94
pro vyhledávání: '"Wolf, William J."'
New constraints on the expansion rate of the Universe seem to favor evolving dark energy in the form of thawing quintessence models, i.e., models for which a canonical, minimally coupled scalar field has, at late times, begun to evolve away from pote
Externí odkaz:
http://arxiv.org/abs/2408.17318
Autor:
Wolf, William J.
Publikováno v:
Phys. Rev. D 110 (2024) 043521
We revisit a class of simple single-field inflation models and demonstrate that they can readily produce a negligible tensor/scalar ratio $r$. Motivated by recent work suggesting the need to introduce higher order operators to stabilise unregulated p
Externí odkaz:
http://arxiv.org/abs/2407.00358
Autor:
Wolf, William J., Duerr, Patrick M.
The paper argues that we ought to conceive of the Dark Energy problem -- the question of how to account for observational data, naturally interpreted as accelerated expansion of the universe -- as a crisis of underdetermined pursuit-worthiness. Not o
Externí odkaz:
http://arxiv.org/abs/2403.04364
Autor:
Wolf, William J., Ferreira, Pedro G.
Publikováno v:
Phys. Rev. D 108 (2023) 103519
There is compelling evidence that the Universe is undergoing a late phase of accelerated expansion. One of the simplest explanations for this behaviour is the presence of dark energy. A plethora of microphysical models for dark energy have been propo
Externí odkaz:
http://arxiv.org/abs/2310.07482
Autor:
Wolf, William J., Duerr, Patrick M.
The paper investigates the historical and contemporary pursuit-worthiness of cosmic inflation-the rationale for working on it (rather than necessarily the evidential support for claims to its approximate truth): what reasons existed, and exist, that
Externí odkaz:
http://arxiv.org/abs/2309.16266
Publikováno v:
Philosophy of Physics 2(1), article 15, pp. 1--20, 2024
We show that the dynamical common core of the recently-discovered non-relativistic geometric trinity of gravity is Maxwell gravitation. Moreover, we explain why no analogous distinct dynamical common core exists in the case of the better-known relati
Externí odkaz:
http://arxiv.org/abs/2309.06889
Autor:
Wolf, William J.
Publikováno v:
Studies in History and Philosophy of Science 103 (2024) 146-158
I apply Dawid's Meta-Empirical Assessment (MEA) methodology to the theory of cosmological inflation. I argue that applying this methodology does not currently offer a compelling case for ascribing non-empirical confirmation to cosmological inflation.
Externí odkaz:
http://arxiv.org/abs/2309.02283
The geometric trinity of gravity comprises three distinct formulations of general relativity: (i) the standard formulation describing gravity in terms of spacetime curvature, (ii) the teleparallel equivalent of general relativity describing gravity i
Externí odkaz:
http://arxiv.org/abs/2308.07100
Canonically, `classic' tests of general relativity (GR) include perihelion precession, the bending of light around stars, and gravitational redshift; `modern' tests have to do with, inter alia, relativistic time delay, equivalence principle tests, gr
Externí odkaz:
http://arxiv.org/abs/2307.10074
Autor:
Duerr, Patrick M., Wolf, William J.
Publikováno v:
Studies in History and Philosophy of Science 101 (2023) 1-23
The paper re-examines the principal methodological questions, arising in the debate over the cosmological standard model's postulate of Dark Matter vs. rivalling proposals that modify standard (Newtonian and general-relativistic) gravitational theory
Externí odkaz:
http://arxiv.org/abs/2306.13026