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thisisphysics

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- Homework Statement
- Hey! So I'm reading a physics book, and they're evaluating this integral: https://imgur.com/DnpYvs6. I'm confused about their statement on the next page. They say that $$e^{i |p| |x|}$$ is exponentially decreasing for large imaginary values of $$|p|$$. Now, I'm confused on how |p| can be negative; isn't it real-valued since we're taking the modulus? Someone mentioned that the modulus can be defined as the square root of the expectation value of p, which would then be complex, but this is something I've never come across, I'm used to the following definition of the modulus: $$|a+ib| = \sqrt{a^2 + b^2}$$. Is this not true here? Any help appreciated!

- Relevant Equations
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