Nick Bostrom is a Professor of Philosophy at the University of Oxford who published the Simulation Argument in the Philosophical Quarterly (2003), which presents a formal logical trilemma about the possibility of simulated realities that has accumulated 2,050+ citations. This is a philosophical argument rather than empirical physics or evidence—it demonstrates that dismissing simulated reality cannot be done casually, but this does not establish that we are simulated.
Are You Living in a Computer Simulation? Philosophical Quarterly 53.211 (2003)