when reading
https://www.researchgate.net/public...g_on_lithium_iron_phosphate_LiFePO4_batteries
it suggests it's perfectly fine to pulse charge a Lifepo4 battery.
i.e. that we do not need a cap to smoothen the ripple while AC voltage rectifying to DC voltage before we use it to charge a Lifepo4 battery.

Is there anyone that knows of research that concludes the opposite?

 

You can probably go by the findings cited,
as long as You stay within the limits of the peak-Voltages and Frequencies in the test.
Do You intend to exactly duplicate the factors in the text,
or are You wanting to do something "similar", but not exactly the same ?

Heat is generally the factor that makes the biggest difference,
which is created by the "Average-Power" being put into the Battery.
But the question is, do You want to risk damaging a very expensive Battery ?

All this figuring and guessing so that You can avoid buying a Capacitor and using a suitable Regulator ?

Have You researched to see how many manufacturers are doing what You propose ?
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The reason I asked is to learn if I am potentially messing up my test cell in the context of my DIY power transformer thread.

I am fully intentional to apply a capacitator once it has arrived though

 

A battery is charged with current, not voltage. It sets its own voltage then the charging waveform does not matter if the peak current is limited so that it is not too high. Do batteries have a "peak" maximum current spec?
Since no charging happens between pulses then the charging time will be longer with pulses unless you risk using a high peak current that causes a fire.

 

The cells I have can, on paper so yet to be confirmed, be charged at 140 amps

 

You have a monster of a battery.
Usually a battery is charged with continuous DC. If you charge with pulses the the pauses between pulses makes the charging time longer.