Yes, this was shown by Schrödinger in 1939: The metric of an expanding universe describes particle production-cf. here:

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.katoon.org/download/schrodinger_1939.pdf&ved=2ahUKEwiy55iatL6OAxXYVqQEHYbBOp0QFnoECBoQAQ&usg=AOvVaw0hVSQJRS3qGHymedQ5HDfU

More precisely, it describes the production of pairs of particles and antiparticles; the mechanism that can lead to an asymmetry between the production of particles vs. antiparticles isn't known in full detail, yet. The Standard Model does have part of it, since it does describe what is known as CP (Charge Conjugation/Parity) violation; however the rate at which this violation occurs in the Standard Model isn't sufficient to describe the matter/antimatter asymmetry.

The answer to

“Can particles emerge from spacetime itself?”

- is fundamentally “No”.

As that completely rigorously proven in the Shevchenko-Tokarevsky’s really philosophical 2007 “The Information as Absolute” conception, recent version of the basic paper see

https://www.researchgate.net/publication/363645560_The_Information_as_Absolute_-_2022_ed, where most of fundamental phenomena/notions, including “Space/space” and “Time/time” [and “Matter”, “Energy”, “Unertia” , “Information”, “Consciousness”, all the phenomena/notions above can be really scientifically defined only together] that are necessary in this case, are rigorously scientifically defined,

- the spacetime of anything, including Matter, fundamentally is only absolutely necessary for anything logical possibility to exist and to change its state, including to be created, and so everything exists and changes in the concrete spacetimes. More see the link above, it is well useful also to read series of 6 reDzennn comments June 22, 23, 24, 25, 26,27; 5 ,4 , 4, 1, 5, 3 passages , in comments line [“Load comments” in the article bottom] of phys.orgarticle “New theory proposes time has three dimensions, with space as a secondary effect”

https://phys.org/news/2025-06-theory-dimensions-space-secondary-effect.html.

I.e. every spacetime is only some logical “empty container”, which is absolutely necessary for everything, but that’s all - including nothing can emerge from any spacetime with any metrics.

At that concrete spaces of concrete informational patterns/systems, including of an informational system “Matter”, are composed by concrete independent “space dimensions”, the number and nomenclature of the dimensions are completely determined only by number and nomenclature of independent degreases of freedom of basic patterns/systems elements at changing their states,

- while everything, in parallel with what happens in the concrete spaces, at every change absolutely obligatorily changes its position [moves in positive direction on a “time interval”] in the unique universal for everything time dimension.

Matter, as that rigorously scientifically shown in the the Shevchenko-Tokarevsky’s Planck scale informational physical model, two main papers are

https://www.researchgate.net/publication/391209088_The_Informational_Conception_and_Basic_Physicsand

https://www.researchgate.net/publication/367397025_The_Informational_Physical_Model_and_Fundamental_Problems_in_Physics

- is based on binary revetrsible logics, and so the Matter’s ultimate base – “Aether” - is the (at least) [4+4+1]4D dense lattice of primary elementary logical structures – (at least) [4+4+1]4D binary reversible fundamental logical elements [FLE], which is placed in the corresponding Matter’s fundamentally absolute, fundamentally flat, fundamentally continuous, and fundamentally “Cartesian”, (at least) [4+4+1]4D spacetime with metrics (at least) (cτ,X,Y,Z, g,w,e,s,ct), FLE “size” and “FLE binary flip time” are Planck length, lP, and Planck time, tP. Utmost universal [really sub-] spacetime has [5]4D metrics (cτ,X,Y,Z,ct); in all metricses ct is the time dimension

At that everything in Matter - particles. fundamental Forces mediators/fields, etc. is/are some disturbances in the lattice, which are created at impact on any the lattice FLE; particles at transmission to a FLE [at leaast] 4Dcτ,X,Y,Z momentum P: “particles” by momentums’ positive cτ-components, “antiparticles” by negative cτ-components.

More see the linked papers, relating to

“…the mechanism that can lead to an asymmetry between the production of particles vs. antiparticles….”

- really “the asymmetry” happened only at Matter’s creation, well probably why and how? - more see reDzennn comment, 6 passages in/to phys.org article “Where did all the antimatter go? This mismatch in how subatomic particles behave could hold a “clue”

https://phys.org/news/2025-07-antimatter-mismatch-subatomic-particles-clue.html Nature (2025)

Cheers

Christopher Young

I have given an explanation of how particles can be created out of vacuum through a quantum mechanical process. That is the starting point of the creation of the universe.

Have a look at my first book. The last book gives a summary together with a confrontation of my findings with recent observations. It comes out very nice.