I can provide information based on current scientific understanding.
The question of whether the laws of physics and the speed of light were different at the beginning of the universe is a topic of active scientific inquiry. The prevailing scientific consensus, supported by a wide range of observational and experimental evidence, is that the laws of physics, including the fundamental constants such as the speed of light, have remained relatively constant throughout the observable universe and over vast spans of time.
The concept of the constancy of physical laws, often referred to as the principle of "cosmic constancy," is a foundational assumption in modern physics. It underlies our understanding of the universe and forms the basis for numerous scientific theories and models.
However, it's important to note that scientists continue to explore and test this assumption through various avenues of research. For example, observational data from cosmological observations, such as the study of distant supernovae or the cosmic microwave background radiation, are examined for any potential signatures of variation in physical constants.
To date, no definitive evidence has been found to suggest significant variations in the fundamental constants, including the speed of light, over cosmological timescales. This provides support for the notion that the laws of physics have remained constant since the early moments of the universe.
Nevertheless, scientific investigations into the nature of physical constants and the early universe remain ongoing, and new discoveries or theoretical advances could potentially shed further light on this topic. As our understanding of the universe continues to evolve, so too may our understanding of the constancy of physical laws and the nature of fundamental constants.