Special Relativity in the 21$^{\rm st}$ century

Special relativity may account for the spacecraft flyby anomalies

Special relativity with two invariant scales: Motivation, Fermions, Bosons, Locality, and Critique

Special Relativity: A Centenary Perspective

Specialized computer algebra system for application in general relativity

Specific dynamics for the Domain-Walls in Einstein-Maxwell-Dilaton theory

Specific heat of a particle on the cone

Spectra of Length and Area in 2+1 Lorentzian Loop Quantum Gravity

Spectra of primordial fluctuations in two-perfect-fluid regular bounces

Spectra of Relic Gravitons and Brans-Dicke Theory

Spectral Analysis of Radial Dirac Operators in the Kerr-Newman Metric and its Applications to Time-periodic Solutions

Spectral Analysis of the Volume Operator in Loop Quantum Gravity

Spectral Boundary Conditions in One-Loop Quantum Cosmology

Spectral Broadening of Radiation from Relativistic Collapsing Objects

Spectral dimension as a probe of the ultraviolet continuum regime of causal dynamical triangulations

Spectral Evolution of the Universe

Spectral Geometry and Causality

Spectral Line Broadening and Angular Blurring due to Spacetime Geometry Fluctuations

Spectral Line Removal in the LIGO Data Analysis System (LDAS)

Spectral Methods for Numerical Relativity