Comment by jimbokun

In this book, a space flight to Alpha Centauri uses an asteroid which is constantly accelerated at 1g for half the flight, then constantly decelerates at 1g for the second half of the trip:

https://en.wikipedia.org/wiki/The_Sparrow_(novel)

That eliminates need for "artificial gravity" and really drove home to me that 1g is really the limiting factor for long range human space flight.