Among the four fundamental forces, gravity is by far the weakest at the particle scale, and the neutrino — already famous for ignoring almost every other interaction — feels the weak nuclear force much more strongly than it feels gravity. That naturally invites a clean question: does gravity affect neutrinos at all? The short answer is yes, in a way that is unmeasurably small in everyday situations but consequential in the right extreme contexts. This article walks through the cases.
The principle: yes, neutrinos feel gravity
In general relativity, anything with mass-energy curves space-time and is in turn deflected by space-time’s curvature. Even massless particles — photons — follow the curvature, which is why gravitational lensing of light by galaxies and galaxy clusters is now routine astronomy.
Neutrinos have mass. Tiny, certainly — bounded by experiments like KATRIN to less than about 0.8 eV per neutrino flavour, possibly far less — but unambiguously non-zero, as proved by the discovery of neutrino oscillations. That non-zero mass means neutrinos couple to gravity exactly as any other massive particle does. They follow geodesics in curved space-time. They contribute to the gravitational field through their mass-energy. They satisfy Einstein’s equivalence principle.
So the conceptual answer is straightforward. The interesting question is how much this matters in practice.
Why we don’t notice it on Earth
On laboratory and human scales, gravity on neutrinos is utterly negligible.
About 100 trillion solar neutrinos cross a human body every second, and the total gravitational mass-energy they collectively carry through you is tiny — many orders of magnitude smaller than the gravitational fluctuations from someone walking past. The deflection of an individual solar neutrino by Earth’s gravity as it crosses the planet is, in principle, calculable, but it is far below anything any conceivable instrument could measure.
The reason is the same one that makes neutrino mass hard to measure: the rest energy of a single neutrino is a fraction of an electronvolt — a vanishingly small number compared with the kinetic energies and gravitational potentials of any everyday process. Gravity scales with mass, and there is essentially no mass to scale with.
So in any practical terrestrial sense, gravity on neutrinos can be ignored. The same is true at every accelerator and every detector. No oscillation experiment, no beta-decay endpoint measurement, no reactor antineutrino survey ever has to correct for terrestrial gravity. The effect is real but invisibly small.
Where gravity on neutrinos becomes consequential
There are three contexts in which gravity on neutrinos genuinely matters.
Core-collapse supernovae
When a massive star runs out of fuel and its core collapses, the remnant becomes a proto-neutron star — an object with mass of order the Sun’s compressed into a region tens of kilometres across. The gravitational fields are extreme. About 99 per cent of the gravitational binding energy released in the collapse leaves the star as a burst of neutrinos in a few seconds.
Inside that environment, gravity does work on the neutrinos. The neutrino spectrum measured on Earth is shifted — slightly, by an amount dictated by the depth of the gravitational potential they have climbed out of — relative to the spectrum at the proto-neutron-star surface. The geometry of the explosion, and the way neutrinos transport energy through it, depend on detailed general-relativistic modelling.
Detection of SN 1987A gave the first observational test of these ideas — the neutrinos arrived consistent with general-relativistic expectations and were used to set sharp bounds on the equivalence principle for neutrinos: the gravitational potential of the Milky Way must act on neutrinos the same way it acts on photons, to within a tiny fraction of a percent. The full source context lives in our supernova neutrinos explainer.
The early universe and cosmology
In the early universe, when temperatures were high enough that the standard model particles formed a hot plasma, neutrinos were one of the dominant species. They decoupled from the plasma about one second after the Big Bang and have been streaming as the cosmic neutrino background ever since.
The relic neutrino population is everywhere, at a density of about 336 per cubic centimetre. Because they have small but non-zero masses, they have slowed from near-light speeds at decoupling to substantially sub-light speeds today. That makes them susceptible to gravitational clustering: relic neutrinos gradually fall into the gravitational potentials of galaxy clusters and superclusters over cosmic time. The cumulative effect modifies the large-scale-structure power spectrum measurably.
This is the basis of the cosmological neutrino mass bound: by looking at how much structure has formed at various scales, surveys like Planck (CMB), DESI, and others constrain the sum of the neutrino masses, currently to roughly 0.1 eV under standard cosmological assumptions. See our cosmological neutrino mass bound explainer.
Without gravity acting on neutrinos, none of this would exist. The bound is a direct consequence of the fact that neutrinos do feel gravity.
Long-baseline propagation through galactic potentials
For high-energy astrophysical neutrinos — the ones detected by IceCube from sources thousands or millions of light-years away — the gravitational potentials traversed during the journey are non-trivial. The dominant effect is a small frequency shift (essentially a gravitational redshift) and a small geometric deflection. Both are below any current experimental resolution, but they are part of the theoretical machinery of multi-messenger astronomy.
Whether neutrinos and photons from the same astrophysical event arrive at the same time, after a multi-million-light-year journey, is a remarkably sharp test of general relativity in the neutrino sector. So far the data are entirely consistent with neutrinos and photons feeling gravity in the same way.
What about neutrinos and black holes?
A natural extension of “are neutrinos affected by gravity?” is “can neutrinos escape a black hole?” The answer is the same as for any other particle: no. Beyond the event horizon, no signal — photonic, neutrinic, or otherwise — can escape. A neutrino travelling outward from inside a Schwarzschild radius is no more privileged than a photon would be. The fact that neutrinos pass through ordinary matter effortlessly does not help them escape from inside an event horizon, where the obstacle is the curvature of space-time itself.
Outside the horizon, neutrinos pass through anything else — including the densest neutron-star matter — far more readily than photons do.
So is gravity on neutrinos important?
It depends on the context. In laboratory physics, accelerator physics, reactor experiments, and any of the day-to-day measurements that fill the neutrino literature, gravity is so small that it is simply absent from the equations. In supernova astrophysics, in cosmology, and in any analysis that involves neutrinos traversing extreme gravitational potentials, it is one of the framing principles of the entire calculation.
The same particle that ignores nearly every other force still respects general relativity. The effect is just very small, until you go somewhere extreme.
For more, see do neutrinos have mass?, how fast do neutrinos travel?, and the cosmological neutrino background explainer.
Related reading: SN 1987A: the supernova that opened neutrino astronomy, Cosmological neutrino mass bound from the CMB, What is a neutrino?.
Frequently asked
Do neutrinos feel gravity?
Yes. Neutrinos have a tiny but non-zero mass, so general relativity requires them to follow the same gravitational rules as any other matter. In practice the effect is unmeasurably small on laboratory scales because the masses involved are so tiny. In extreme astrophysical and cosmological contexts, however, gravity on neutrinos becomes measurable and important.
Are neutrinos bent by gravity?
In principle yes — gravitational lensing applies to neutrinos as to photons. In practice we don't observe individual neutrino lensing because neutrinos are detected so rarely, but the cumulative effect of gravity on the cosmic neutrino population shows up in large-scale-structure surveys. The 1987A supernova neutrinos travelled through the gravitational potential of the Milky Way along with their accompanying light, providing a test of Einstein's equivalence principle for neutrinos.
Why don't we notice gravity on the neutrinos passing through us?
Because the neutrino's mass is many orders of magnitude smaller than any other particle's. Even at the 100 trillion solar neutrinos per second crossing a human body, the total gravitational mass they carry is utterly negligible — not measurable by any apparatus and far below the natural fluctuations in the local gravitational field.
Did neutrinos and light from SN 1987A arrive at the same time?
Effectively yes. The neutrinos arrived about three hours before the optical flash, but that gap is explained by the time it takes light to escape the dense, opaque outer layers of the collapsing star, not by a different gravitational delay. The simultaneous arrival of light and neutrinos after travelling through the galactic gravitational potential confirmed the equivalence principle for neutrinos to high precision.
Does the cosmic neutrino background fall into galaxies?
Yes, gradually. The relic neutrinos left over from the Big Bang have rest energies of fractions of an electronvolt and travel at sub-light speeds. Over cosmic time, gravitational potentials of large structures slowly cluster these neutrinos around galaxy clusters, an effect that contributes to current cosmological neutrino mass bounds derived from large-scale structure surveys.
Cite this article 5 formats
APA
Neutrino Times Editorial Team. (2026, May 21). Are neutrinos affected by gravity?. Neutrino Times. https://neutrino-times.com/articles/are-neutrinos-affected-by-gravity/
Chicago
Neutrino Times Editorial Team. "Are neutrinos affected by gravity?." Neutrino Times, May 21, 2026. https://neutrino-times.com/articles/are-neutrinos-affected-by-gravity/.
MLA
Neutrino Times Editorial Team. "Are neutrinos affected by gravity?." Neutrino Times, 21 May. 2026, https://neutrino-times.com/articles/are-neutrinos-affected-by-gravity/.
BibTeX
@misc{neutrino-times-are-neutrinos-affected-by-gravity,
author = {Neutrino Times Editorial Team},
title = {Are neutrinos affected by gravity?},
howpublished = {Neutrino Times},
year = {2026},
month = {may},
url = {https://neutrino-times.com/articles/are-neutrinos-affected-by-gravity/},
note = {Accessed: 2026-05-21}
} RIS
TY - GEN TI - Are neutrinos affected by gravity? AU - Neutrino Times Editorial Team PY - 2026 DA - 2026-05-21 PB - Neutrino Times UR - https://neutrino-times.com/articles/are-neutrinos-affected-by-gravity/ ER -